Updated documentation.

Record dependency on six

Examples/Broadcast.py

@@ -39,7 +39,7 @@ def program_setup(configpath, channel=None):
 
     # We specify a callback that will get called every time
     # the destination receives data.
-    broadcast_destination.packet_callback(packet_callback)
+    broadcast_destination.set_packet_callback(packet_callback)
     
     # Everything's ready!
     # Let's hand over control to the main loop

Examples/Echo.py

@@ -52,7 +52,7 @@ def server(configpath):
     # Tell the destination which function in our program to
     # run when a packet is received. We do this so we can
     # print a log message when the server receives a request
-    echo_destination.packet_callback(server_callback)
+    echo_destination.set_packet_callback(server_callback)
 
     # Everything's ready!
     # Let's Wait for client requests or user input
@@ -170,12 +170,12 @@ def client(destination_hexhash, configpath, timeout=None):
             # the packet times out.
             if timeout != None:
                 packet_receipt.set_timeout(timeout)
-                packet_receipt.timeout_callback(packet_timed_out)
+                packet_receipt.set_timeout_callback(packet_timed_out)
 
             # We can then set a delivery callback on the receipt.
             # This will get automatically called when a proof for
             # this specific packet is received from the destination.
-            packet_receipt.delivery_callback(packet_delivered)
+            packet_receipt.set_delivery_callback(packet_delivered)
 
             # Tell the user that the echo request was sent
             RNS.log("Sent echo request to "+RNS.prettyhexrep(request_destination.hash))
@@ -189,7 +189,7 @@ def client(destination_hexhash, configpath, timeout=None):
 # receives a proof packet.
 def packet_delivered(receipt):
     if receipt.status == RNS.PacketReceipt.DELIVERED:
-        rtt = receipt.rtt()
+        rtt = receipt.get_rtt()
         if (rtt >= 1):
             rtt = round(rtt, 3)
             rttstring = str(rtt)+" seconds"

Examples/Filetransfer.py

@@ -65,7 +65,7 @@ def server(configpath, path):
 
     # We configure a function that will get called every time
     # a new client creates a link to this destination.
-    server_destination.link_established_callback(client_connected)
+    server_destination.set_link_established_callback(client_connected)
 
     # Everything's ready!
     # Let's Wait for client requests or user input
@@ -102,7 +102,7 @@ def client_connected(link):
     if os.path.isdir(serve_path):
         RNS.log("Client connected, sending file list...")
 
-        link.link_closed_callback(client_disconnected)
+        link.set_link_closed_callback(client_disconnected)
 
         # We pack a list of files for sending in a packet
         data = umsgpack.packb(list_files())
@@ -114,8 +114,8 @@ def client_connected(link):
             list_packet = RNS.Packet(link, data)
             list_receipt = list_packet.send()
             list_receipt.set_timeout(APP_TIMEOUT)
-            list_receipt.delivery_callback(list_delivered)
-            list_receipt.timeout_callback(list_timeout)
+            list_receipt.set_delivery_callback(list_delivered)
+            list_receipt.set_timeout_callback(list_timeout)
         else:
             RNS.log("Too many files in served directory!", RNS.LOG_ERROR)
             RNS.log("You should implement a function to split the filelist over multiple packets.", RNS.LOG_ERROR)
@@ -125,7 +125,7 @@ def client_connected(link):
         # open until the client requests a file. We'll
         # configure a function that get's called when
         # the client sends a packet with a file request.
-        link.packet_callback(client_request)
+        link.set_packet_callback(client_request)
     else:
         RNS.log("Client connected, but served path no longer exists!", RNS.LOG_ERROR)
         link.teardown()
@@ -135,7 +135,12 @@ def client_disconnected(link):
 
 def client_request(message, packet):
     global serve_path
-    filename = message.decode("utf-8")
+
+    try:
+        filename = message.decode("utf-8")
+    except Exception as e:
+        filename = None
+
     if filename in list_files():
         try:
             # If we have the requested file, we'll
@@ -254,18 +259,18 @@ def client(destination_hexhash, configpath):
     # We expect any normal data packets on the link
     # to contain a list of served files, so we set
     # a callback accordingly
-    link.packet_callback(filelist_received)
+    link.set_packet_callback(filelist_received)
 
     # We'll also set up functions to inform the
     # user when the link is established or closed
-    link.link_established_callback(link_established)
-    link.link_closed_callback(link_closed)
+    link.set_link_established_callback(link_established)
+    link.set_link_closed_callback(link_closed)
 
     # And set the link to automatically begin
     # downloading advertised resources
     link.set_resource_strategy(RNS.Link.ACCEPT_ALL)
-    link.resource_started_callback(download_began)
-    link.resource_concluded_callback(download_concluded)
+    link.set_resource_started_callback(download_began)
+    link.set_resource_concluded_callback(download_concluded)
 
     menu()
 
@@ -353,7 +358,7 @@ def print_menu():
         print("")
         while menu_mode == "downloading":
             global current_download
-            percent = round(current_download.progress() * 100.0, 1)
+            percent = round(current_download.get_progress() * 100.0, 1)
             print(("\rProgress: "+str(percent)+" %   "), end=' ')
             sys.stdout.flush()
             time.sleep(0.1)
@@ -497,7 +502,6 @@ def download_concluded(resource):
 
     saved_filename = current_filename
 
-
     if resource.status == RNS.Resource.COMPLETE:
         counter = 0
         while os.path.isfile(saved_filename):

Examples/Identify.py

@@ -0,0 +1,310 @@
+##########################################################
+# This RNS example demonstrates how to set up a link to  #
+# a destination, and identify the initiator to it's peer #
+##########################################################
+
+import os
+import sys
+import time
+import argparse
+import RNS
+
+# Let's define an app name. We'll use this for all
+# destinations we create. Since this echo example
+# is part of a range of example utilities, we'll put
+# them all within the app namespace "example_utilities"
+APP_NAME = "example_utilities"
+
+##########################################################
+#### Server Part #########################################
+##########################################################
+
+# A reference to the latest client link that connected
+latest_client_link = None
+
+# This initialisation is executed when the users chooses
+# to run as a server
+def server(configpath):
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+    
+    # Randomly create a new identity for our link example
+    server_identity = RNS.Identity()
+
+    # We create a destination that clients can connect to. We
+    # want clients to create links to this destination, so we
+    # need to create a "single" destination type.
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.IN,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "identifyexample"
+    )
+
+    # We configure a function that will get called every time
+    # a new client creates a link to this destination.
+    server_destination.set_link_established_callback(client_connected)
+
+    # Everything's ready!
+    # Let's Wait for client requests or user input
+    server_loop(server_destination)
+
+def server_loop(destination):
+    # Let the user know that everything is ready
+    RNS.log(
+        "Link identification example "+
+        RNS.prettyhexrep(destination.hash)+
+        " running, waiting for a connection."
+    )
+
+    RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
+
+    # We enter a loop that runs until the users exits.
+    # If the user hits enter, we will announce our server
+    # destination on the network, which will let clients
+    # know how to create messages directed towards it.
+    while True:
+        entered = input()
+        destination.announce()
+        RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
+
+# When a client establishes a link to our server
+# destination, this function will be called with
+# a reference to the link.
+def client_connected(link):
+    global latest_client_link
+
+    RNS.log("Client connected")
+    link.set_link_closed_callback(client_disconnected)
+    link.set_packet_callback(server_packet_received)
+    link.set_remote_identified_callback(remote_identified)
+    latest_client_link = link
+
+def client_disconnected(link):
+    RNS.log("Client disconnected")
+
+def remote_identified(identity):
+    RNS.log("Remote identified as: "+str(identity))
+
+def server_packet_received(message, packet):
+    global latest_client_link
+
+    # Get the originating identity for display
+    remote_peer =  "unidentified peer"
+    if packet.link.get_remote_identity() != None:
+        remote_peer = str(packet.link.get_remote_identity())
+
+    # When data is received over any active link,
+    # it will all be directed to the last client
+    # that connected.
+    text = message.decode("utf-8")
+
+    RNS.log("Received data from "+remote_peer+": "+text)
+    
+    reply_text = "I received \""+text+"\" over the link from "+remote_peer
+    reply_data = reply_text.encode("utf-8")
+    RNS.Packet(latest_client_link, reply_data).send()
+
+
+##########################################################
+#### Client Part #########################################
+##########################################################
+
+# A reference to the server link
+server_link = None
+
+# A reference to the client identity
+client_identity = None
+
+# This initialisation is executed when the users chooses
+# to run as a client
+def client(destination_hexhash, configpath):
+    global client_identity
+    # We need a binary representation of the destination
+    # hash that was entered on the command line
+    try:
+        if len(destination_hexhash) != 20:
+            raise ValueError("Destination length is invalid, must be 20 hexadecimal characters (10 bytes)")
+        destination_hash = bytes.fromhex(destination_hexhash)
+    except:
+        RNS.log("Invalid destination entered. Check your input!\n")
+        exit()
+
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+
+    # Create a new client identity
+    client_identity = RNS.Identity()
+    RNS.log(
+        "Client created new identity "+
+        str(client_identity)
+    )
+
+    # Check if we know a path to the destination
+    if not RNS.Transport.has_path(destination_hash):
+        RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
+        RNS.Transport.request_path(destination_hash)
+        while not RNS.Transport.has_path(destination_hash):
+            time.sleep(0.1)
+
+    # Recall the server identity
+    server_identity = RNS.Identity.recall(destination_hash)
+
+    # Inform the user that we'll begin connecting
+    RNS.log("Establishing link with server...")
+
+    # When the server identity is known, we set
+    # up a destination
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.OUT,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "identifyexample"
+    )
+
+    # And create a link
+    link = RNS.Link(server_destination)
+
+    # We set a callback that will get executed
+    # every time a packet is received over the
+    # link
+    link.set_packet_callback(client_packet_received)
+
+    # We'll also set up functions to inform the
+    # user when the link is established or closed
+    link.set_link_established_callback(link_established)
+    link.set_link_closed_callback(link_closed)
+
+    # Everything is set up, so let's enter a loop
+    # for the user to interact with the example
+    client_loop()
+
+def client_loop():
+    global server_link
+
+    # Wait for the link to become active
+    while not server_link:
+        time.sleep(0.1)
+
+    should_quit = False
+    while not should_quit:
+        try:
+            print("> ", end=" ")
+            text = input()
+
+            # Check if we should quit the example
+            if text == "quit" or text == "q" or text == "exit":
+                should_quit = True
+                server_link.teardown()
+
+            # If not, send the entered text over the link
+            if text != "":
+                data = text.encode("utf-8")
+                if len(data) <= RNS.Link.MDU:
+                    RNS.Packet(server_link, data).send()
+                else:
+                    RNS.log(
+                        "Cannot send this packet, the data size of "+
+                        str(len(data))+" bytes exceeds the link packet MDU of "+
+                        str(RNS.Link.MDU)+" bytes",
+                        RNS.LOG_ERROR
+                    )
+
+        except Exception as e:
+            RNS.log("Error while sending data over the link: "+str(e))
+            should_quit = True
+            server_link.teardown()
+
+# This function is called when a link
+# has been established with the server
+def link_established(link):
+    # We store a reference to the link
+    # instance for later use
+    global server_link, client_identity
+    server_link = link
+
+    # Inform the user that the server is
+    # connected
+    RNS.log("Link established with server, identifying to remote peer...")
+
+    link.identify(client_identity)
+
+# When a link is closed, we'll inform the
+# user, and exit the program
+def link_closed(link):
+    if link.teardown_reason == RNS.Link.TIMEOUT:
+        RNS.log("The link timed out, exiting now")
+    elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
+        RNS.log("The link was closed by the server, exiting now")
+    else:
+        RNS.log("Link closed, exiting now")
+    
+    RNS.Reticulum.exit_handler()
+    time.sleep(1.5)
+    os._exit(0)
+
+# When a packet is received over the link, we
+# simply print out the data.
+def client_packet_received(message, packet):
+    text = message.decode("utf-8")
+    RNS.log("Received data on the link: "+text)
+    print("> ", end=" ")
+    sys.stdout.flush()
+
+
+##########################################################
+#### Program Startup #####################################
+##########################################################
+
+# This part of the program runs at startup,
+# and parses input of from the user, and then
+# starts up the desired program mode.
+if __name__ == "__main__":
+    try:
+        parser = argparse.ArgumentParser(description="Simple link example")
+
+        parser.add_argument(
+            "-s",
+            "--server",
+            action="store_true",
+            help="wait for incoming link requests from clients"
+        )
+
+        parser.add_argument(
+            "--config",
+            action="store",
+            default=None,
+            help="path to alternative Reticulum config directory",
+            type=str
+        )
+
+        parser.add_argument(
+            "destination",
+            nargs="?",
+            default=None,
+            help="hexadecimal hash of the server destination",
+            type=str
+        )
+
+        args = parser.parse_args()
+
+        if args.config:
+            configarg = args.config
+        else:
+            configarg = None
+
+        if args.server:
+            server(configarg)
+        else:
+            if (args.destination == None):
+                print("")
+                parser.print_help()
+                print("")
+            else:
+                client(args.destination, configarg)
+
+    except KeyboardInterrupt:
+        print("")
+        exit()

Examples/Link.py

@@ -44,7 +44,7 @@ def server(configpath):
 
     # We configure a function that will get called every time
     # a new client creates a link to this destination.
-    server_destination.link_established_callback(client_connected)
+    server_destination.set_link_established_callback(client_connected)
 
     # Everything's ready!
     # Let's Wait for client requests or user input
@@ -76,8 +76,8 @@ def client_connected(link):
     global latest_client_link
 
     RNS.log("Client connected")
-    link.link_closed_callback(client_disconnected)
-    link.packet_callback(server_packet_received)
+    link.set_link_closed_callback(client_disconnected)
+    link.set_packet_callback(server_packet_received)
     latest_client_link = link
 
 def client_disconnected(link):
@@ -149,12 +149,12 @@ def client(destination_hexhash, configpath):
     # We set a callback that will get executed
     # every time a packet is received over the
     # link
-    link.packet_callback(client_packet_received)
+    link.set_packet_callback(client_packet_received)
 
     # We'll also set up functions to inform the
     # user when the link is established or closed
-    link.link_established_callback(link_established)
-    link.link_closed_callback(link_closed)
+    link.set_link_established_callback(link_established)
+    link.set_link_closed_callback(link_closed)
 
     # Everything is set up, so let's enter a loop
     # for the user to interact with the example
@@ -181,8 +181,18 @@ def client_loop():
             # If not, send the entered text over the link
             if text != "":
                 data = text.encode("utf-8")
-                RNS.Packet(server_link, data).send()
+                if len(data) <= RNS.Link.MDU:
+                    RNS.Packet(server_link, data).send()
+                else:
+                    RNS.log(
+                        "Cannot send this packet, the data size of "+
+                        str(len(data))+" bytes exceeds the link packet MDU of "+
+                        str(RNS.Link.MDU)+" bytes",
+                        RNS.LOG_ERROR
+                    )
+
         except Exception as e:
+            RNS.log("Error while sending data over the link: "+str(e))
             should_quit = True
             server_link.teardown()
 

Examples/Request.py

@@ -0,0 +1,283 @@
+##########################################################
+# This RNS example demonstrates how to set perform       #
+# requests and receive responses over a link.            #
+##########################################################
+
+import os
+import sys
+import time
+import random
+import argparse
+import RNS
+
+# Let's define an app name. We'll use this for all
+# destinations we create. Since this echo example
+# is part of a range of example utilities, we'll put
+# them all within the app namespace "example_utilities"
+APP_NAME = "example_utilities"
+
+##########################################################
+#### Server Part #########################################
+##########################################################
+
+# A reference to the latest client link that connected
+latest_client_link = None
+
+def random_text_generator(path, data, request_id, remote_identity, requested_at):
+    RNS.log("Generating response to request "+RNS.prettyhexrep(request_id))
+    texts = ["They looked up", "On each full moon", "Becky was upset", "I’ll stay away from it", "The pet shop stocks everything"]
+    return texts[random.randint(0, len(texts)-1)]
+
+# This initialisation is executed when the users chooses
+# to run as a server
+def server(configpath):
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+    
+    # Randomly create a new identity for our link example
+    server_identity = RNS.Identity()
+
+    # We create a destination that clients can connect to. We
+    # want clients to create links to this destination, so we
+    # need to create a "single" destination type.
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.IN,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "requestexample"
+    )
+
+    # We configure a function that will get called every time
+    # a new client creates a link to this destination.
+    server_destination.set_link_established_callback(client_connected)
+
+    # We register a request handler for handling incoming
+    # requests over any established links.
+    server_destination.register_request_handler(
+        "/random/text",
+        response_generator = random_text_generator,
+        allow = RNS.Destination.ALLOW_ALL
+    )
+
+    # Everything's ready!
+    # Let's Wait for client requests or user input
+    server_loop(server_destination)
+
+def server_loop(destination):
+    # Let the user know that everything is ready
+    RNS.log(
+        "Request example "+
+        RNS.prettyhexrep(destination.hash)+
+        " running, waiting for a connection."
+    )
+
+    RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
+
+    # We enter a loop that runs until the users exits.
+    # If the user hits enter, we will announce our server
+    # destination on the network, which will let clients
+    # know how to create messages directed towards it.
+    while True:
+        entered = input()
+        destination.announce()
+        RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
+
+# When a client establishes a link to our server
+# destination, this function will be called with
+# a reference to the link.
+def client_connected(link):
+    global latest_client_link
+
+    RNS.log("Client connected")
+    link.set_link_closed_callback(client_disconnected)
+    latest_client_link = link
+
+def client_disconnected(link):
+    RNS.log("Client disconnected")
+
+
+##########################################################
+#### Client Part #########################################
+##########################################################
+
+# A reference to the server link
+server_link = None
+
+# This initialisation is executed when the users chooses
+# to run as a client
+def client(destination_hexhash, configpath):
+    # We need a binary representation of the destination
+    # hash that was entered on the command line
+    try:
+        if len(destination_hexhash) != 20:
+            raise ValueError("Destination length is invalid, must be 20 hexadecimal characters (10 bytes)")
+        destination_hash = bytes.fromhex(destination_hexhash)
+    except:
+        RNS.log("Invalid destination entered. Check your input!\n")
+        exit()
+
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+
+    # Check if we know a path to the destination
+    if not RNS.Transport.has_path(destination_hash):
+        RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
+        RNS.Transport.request_path(destination_hash)
+        while not RNS.Transport.has_path(destination_hash):
+            time.sleep(0.1)
+
+    # Recall the server identity
+    server_identity = RNS.Identity.recall(destination_hash)
+
+    # Inform the user that we'll begin connecting
+    RNS.log("Establishing link with server...")
+
+    # When the server identity is known, we set
+    # up a destination
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.OUT,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "requestexample"
+    )
+
+    # And create a link
+    link = RNS.Link(server_destination)
+
+    # We'll set up functions to inform the
+    # user when the link is established or closed
+    link.set_link_established_callback(link_established)
+    link.set_link_closed_callback(link_closed)
+
+    # Everything is set up, so let's enter a loop
+    # for the user to interact with the example
+    client_loop()
+
+def client_loop():
+    global server_link
+
+    # Wait for the link to become active
+    while not server_link:
+        time.sleep(0.1)
+
+    should_quit = False
+    while not should_quit:
+        try:
+            print("> ", end=" ")
+            text = input()
+
+            # Check if we should quit the example
+            if text == "quit" or text == "q" or text == "exit":
+                should_quit = True
+                server_link.teardown()
+
+            else:
+                server_link.request(
+                    "/random/text",
+                    data = None,
+                    response_callback = got_response,
+                    failed_callback = request_failed
+                )
+
+
+        except Exception as e:
+            RNS.log("Error while sending request over the link: "+str(e))
+            should_quit = True
+            server_link.teardown()
+
+def got_response(request_receipt):
+    request_id = request_receipt.request_id
+    response = request_receipt.response
+
+    RNS.log("Got response for request "+RNS.prettyhexrep(request_id)+": "+str(response))
+
+def request_received(request_receipt):
+    RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" was received by the remote peer.")
+
+def request_failed(request_receipt):
+    RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" failed.")
+
+
+# This function is called when a link
+# has been established with the server
+def link_established(link):
+    # We store a reference to the link
+    # instance for later use
+    global server_link
+    server_link = link
+
+    # Inform the user that the server is
+    # connected
+    RNS.log("Link established with server, hit enter to perform a request, or type in \"quit\" to quit")
+
+# When a link is closed, we'll inform the
+# user, and exit the program
+def link_closed(link):
+    if link.teardown_reason == RNS.Link.TIMEOUT:
+        RNS.log("The link timed out, exiting now")
+    elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
+        RNS.log("The link was closed by the server, exiting now")
+    else:
+        RNS.log("Link closed, exiting now")
+    
+    RNS.Reticulum.exit_handler()
+    time.sleep(1.5)
+    os._exit(0)
+
+
+##########################################################
+#### Program Startup #####################################
+##########################################################
+
+# This part of the program runs at startup,
+# and parses input of from the user, and then
+# starts up the desired program mode.
+if __name__ == "__main__":
+    try:
+        parser = argparse.ArgumentParser(description="Simple request/response example")
+
+        parser.add_argument(
+            "-s",
+            "--server",
+            action="store_true",
+            help="wait for incoming requests from clients"
+        )
+
+        parser.add_argument(
+            "--config",
+            action="store",
+            default=None,
+            help="path to alternative Reticulum config directory",
+            type=str
+        )
+
+        parser.add_argument(
+            "destination",
+            nargs="?",
+            default=None,
+            help="hexadecimal hash of the server destination",
+            type=str
+        )
+
+        args = parser.parse_args()
+
+        if args.config:
+            configarg = args.config
+        else:
+            configarg = None
+
+        if args.server:
+            server(configarg)
+        else:
+            if (args.destination == None):
+                print("")
+                parser.print_help()
+                print("")
+            else:
+                client(args.destination, configarg)
+
+    except KeyboardInterrupt:
+        print("")
+        exit()

Examples/Speedtest.py

@@ -0,0 +1,337 @@
+##########################################################
+# This RNS example demonstrates a simple speedtest       #
+# program to measure link throughput.                    #
+##########################################################
+
+import os
+import sys
+import time
+import argparse
+import RNS
+
+# Let's define an app name. We'll use this for all
+# destinations we create.
+APP_NAME = "example_utilities"
+
+##########################################################
+#### Server Part #########################################
+##########################################################
+
+latest_client_link = None
+first_packet_at = None
+last_packet_at = None
+received_data = 0
+rc = 0
+data_cap = 2*1024*1024
+printed = False
+
+# This initialisation is executed when the users chooses
+# to run as a server
+def server(configpath):
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+    
+    # Randomly create a new identity for our link example
+    server_identity = RNS.Identity()
+
+    # We create a destination that clients can connect to. We
+    # want clients to create links to this destination, so we
+    # need to create a "single" destination type.
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.IN,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "speedtest"
+    )
+
+    # We configure a function that will get called every time
+    # a new client creates a link to this destination.
+    server_destination.set_link_established_callback(client_connected)
+
+    # Everything's ready!
+    # Let's Wait for client requests or user input
+    server_loop(server_destination)
+
+def server_loop(destination):
+    # Let the user know that everything is ready
+    RNS.log(
+        "Speedtest "+
+        RNS.prettyhexrep(destination.hash)+
+        " running, waiting for a connection."
+    )
+
+    RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
+
+    # We enter a loop that runs until the users exits.
+    # If the user hits enter, we will announce our server
+    # destination on the network, which will let clients
+    # know how to create messages directed towards it.
+    while True:
+        entered = input()
+        destination.announce()
+        RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
+
+# When a client establishes a link to our server
+# destination, this function will be called with
+# a reference to the link.
+def client_connected(link):
+    global latest_client_link, first_packet_at, rc
+
+    RNS.log("Client connected")
+    first_packet_at = time.time()
+    rc = 0
+    link.set_link_closed_callback(client_disconnected)
+    link.set_packet_callback(server_packet_received)
+    latest_client_link = link
+
+def client_disconnected(link):
+    RNS.log("Client disconnected")
+
+
+# A convenience function for printing a human-
+# readable file size
+def size_str(num, suffix='B'):
+    units = ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']
+    last_unit = 'Yi'
+
+    if suffix == 'b':
+        num *= 8
+        units = ['','K','M','G','T','P','E','Z']
+        last_unit = 'Y'
+
+    for unit in units:
+        if abs(num) < 1024.0:
+            return "%3.2f %s%s" % (num, unit, suffix)
+        num /= 1024.0
+    return "%.2f %s%s" % (num, last_unit, suffix)
+
+
+def server_packet_received(message, packet):
+    global latest_client_link, first_packet_at, last_packet_at, received_data, rc, data_cap
+    
+    received_data += len(packet.data)
+    
+    rc += 1
+    if rc >= 50:
+        RNS.log(size_str(received_data))
+        rc = 0
+
+    if received_data > data_cap:
+        rcv_d = received_data
+        received_data = 0
+        rc = 0
+
+        last_packet_at = time.time()
+        
+        # Print statistics
+        download_time = last_packet_at-first_packet_at
+        hours, rem = divmod(download_time, 3600)
+        minutes, seconds = divmod(rem, 60)
+        timestring = "{:0>2}:{:0>2}:{:05.2f}".format(int(hours),int(minutes),seconds)
+
+        print("")
+        print("")
+        print("--- Statistics -----")
+        print("\tTime taken       : "+timestring)
+        print("\tData transferred : "+size_str(rcv_d))
+        print("\tTransfer rate    : "+size_str(rcv_d/download_time, suffix='b')+"/s")
+        print("")
+
+        sys.stdout.flush()
+        latest_client_link.teardown()
+        time.sleep(0.2)
+        rc = 0
+        received_data = 0
+        # latest_client_link.teardown()
+        # os._exit(0)
+
+
+##########################################################
+#### Client Part #########################################
+##########################################################
+
+# A reference to the server link
+server_link = None
+
+# This initialisation is executed when the users chooses
+# to run as a client
+def client(destination_hexhash, configpath):
+    # We need a binary representation of the destination
+    # hash that was entered on the command line
+    try:
+        if len(destination_hexhash) != 20:
+            raise ValueError("Destination length is invalid, must be 20 hexadecimal characters (10 bytes)")
+        destination_hash = bytes.fromhex(destination_hexhash)
+    except:
+        RNS.log("Invalid destination entered. Check your input!\n")
+        exit()
+
+    # We must first initialise Reticulum
+    reticulum = RNS.Reticulum(configpath)
+
+    # Check if we know a path to the destination
+    if not RNS.Transport.has_path(destination_hash):
+        RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
+        RNS.Transport.request_path(destination_hash)
+        while not RNS.Transport.has_path(destination_hash):
+            time.sleep(0.1)
+
+    # Recall the server identity
+    server_identity = RNS.Identity.recall(destination_hash)
+
+    # Inform the user that we'll begin connecting
+    RNS.log("Establishing link with server...")
+
+    # When the server identity is known, we set
+    # up a destination
+    server_destination = RNS.Destination(
+        server_identity,
+        RNS.Destination.OUT,
+        RNS.Destination.SINGLE,
+        APP_NAME,
+        "speedtest"
+    )
+
+    # And create a link
+    link = RNS.Link(server_destination)
+
+    # We'll also set up functions to inform the
+    # user when the link is established or closed
+    link.set_link_established_callback(link_established)
+    link.set_link_closed_callback(link_closed)
+
+    # Everything is set up, so let's enter a loop
+    # for the user to interact with the example
+    client_loop()
+
+def client_loop():
+    global server_link
+
+    # Wait for the link to become active
+    while not server_link:
+        time.sleep(0.1)
+
+    should_quit = False
+    while not should_quit:
+        try:
+            text = input()
+
+            # Check if we should quit the example
+            if text == "quit" or text == "q" or text == "exit":
+                should_quit = True
+                server_link.teardown()
+
+        except Exception as e:
+            raise e
+
+# This function is called when a link
+# has been established with the server
+def link_established(link):
+    # We store a reference to the link
+    # instance for later use
+    global server_link, data_cap, printed
+    server_link = link
+    data_sent = 0
+
+    # Inform the user that the server is
+    # connected
+    RNS.log("Link established with server,sending...")
+    rd = os.urandom(RNS.Link.MDU)
+    started = time.time()
+    while link.status == RNS.Link.ACTIVE and data_sent < data_cap*1.25:
+        RNS.Packet(server_link, rd, create_receipt=False).send()
+        data_sent += len(rd)
+
+        if data_sent > data_cap and not printed:
+            printed = True
+            ended = time.time()
+            # Print statistics
+            download_time = ended-started
+            hours, rem = divmod(download_time, 3600)
+            minutes, seconds = divmod(rem, 60)
+            timestring = "{:0>2}:{:0>2}:{:05.2f}".format(int(hours),int(minutes),seconds)
+            print("")
+            print("")
+            print("--- Statistics -----")
+            print("\tTime taken       : "+timestring)
+            print("\tData transferred : "+size_str(data_sent))
+            print("\tTransfer rate    : "+size_str(data_sent/download_time, suffix='b')+"/s")
+            print("")
+
+            sys.stdout.flush()
+            time.sleep(0.1)
+
+
+# When a link is closed, we'll inform the
+# user, and exit the program
+def link_closed(link):
+    if link.teardown_reason == RNS.Link.TIMEOUT:
+        RNS.log("The link timed out, exiting now")
+    elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
+        RNS.log("The link was closed by the server, exiting now")
+    else:
+        RNS.log("Link closed, exiting now")
+    
+    RNS.Reticulum.exit_handler()
+
+    time.sleep(1.5)
+    os._exit(0)
+
+def client_packet_received(message, packet):
+    pass
+
+##########################################################
+#### Program Startup #####################################
+##########################################################
+
+# This part of the program runs at startup,
+# and parses input of from the user, and then
+# starts up the desired program mode.
+if __name__ == "__main__":
+    try:
+        parser = argparse.ArgumentParser(description="Speedtest example")
+
+        parser.add_argument(
+            "-s",
+            "--server",
+            action="store_true",
+            help="wait for incoming requests from clients"
+        )
+
+        parser.add_argument(
+            "--config",
+            action="store",
+            default=None,
+            help="path to alternative Reticulum config directory",
+            type=str
+        )
+
+        parser.add_argument(
+            "destination",
+            nargs="?",
+            default=None,
+            help="hexadecimal hash of the server destination",
+            type=str
+        )
+
+        args = parser.parse_args()
+
+        if args.config:
+            configarg = args.config
+        else:
+            configarg = None
+
+        if args.server:
+            server(configarg)
+        else:
+            if (args.destination == None):
+                print("")
+                parser.print_help()
+                print("")
+            else:
+                client(args.destination, configarg)
+
+    except KeyboardInterrupt:
+        print("")
+        exit()

Notes/Wire Format

@@ -1,54 +0,0 @@
-Reticulum Wire Format
-
-Header Types
------------------
-type 1          00  Two byte header, one 10 byte address field
-type 2          01  Two byte header, two 10 byte address fields
-type 3          10  Reserved
-type 4          11  Reserved
-
-
-Propagation Types
------------------
-broadcast       00
-transport       01
-reserved        10
-reserved        11
-
-
-Destination Types
------------------
-single          00
-group           01
-plain           10
-link            11
-
-
-Packet Types
------------------
-data            00
-announce        01
-link request    10
-proof           11
-
-
-+- Packet Example -+
-
-01010000 00000100 [ADDR1, 10 bytes] [ADDR2, 10 bytes] [CONTEXT, 1 byte] [DATA]
- | | | |    |
- | | | |    +-- Hops = 4
- | | | +------- DATA packet
- | | +--------- SINGLE destination
- | +----------- TRANSPORT propagation type
- +------------- HEADER_2, two byte header, two address fields
-
-
- +- Packet Example -+
-
-00000000 00000111 [ADDR1, 10 bytes] [CONTEXT, 1 byte] [DATA]
- | | | |    |
- | | | |    +-- Hops = 7
- | | | +------- DATA packet
- | | +--------- SINGLE destination
- | +----------- BROADCAST propagation type
- +------------- HEADER_1, two byte header, one address field

README.md

@@ -18,12 +18,13 @@ For more info, see [unsigned.io/projects/reticulum](https://unsigned.io/projects
 ## Notable Features
  - Coordination-less globally unique adressing and identification
  - Fully self-configuring multi-hop routing
- - Asymmetric RSA encryption and signatures as basis for all communication
- - Perfect Forward Secrecy on links with ephemereal Elliptic Curve Diffie-Hellman keys (on Curve25519)
- - Reticulum uses the [Fernet](https://github.com/fernet/spec/blob/master/Spec.md) specification for encryption on links and to group destinations
+ - Asymmetric X25519 encryption and Ed25519 signatures as a basis for all communication
+ - Forward Secrecy with ephemereal Elliptic Curve Diffie-Hellman keys on Curve25519
+ - Reticulum uses the [Fernet](https://github.com/fernet/spec/blob/master/Spec.md) specification for encryption
     - AES-128 in CBC mode with PKCS7 padding
     - HMAC using SHA256 for authentication
     - IVs are generated through os.urandom()
+    - Keys are ephemeral and derived from an ECDH key exchange on Curve25519
  - Unforgeable packet delivery confirmations
  - A variety of supported interface types
  - An intuitive and easy-to-use API
@@ -31,9 +32,13 @@ For more info, see [unsigned.io/projects/reticulum](https://unsigned.io/projects
     - Reticulum can handle a few bytes of data or files of many gigabytes
     - Sequencing, transfer coordination and checksumming is automatic
     - The API is very easy to use, and provides transfer progress
+ - Lightweight, flexible and expandable Request/Response mechanism
+ - Efficient link establishment
+    - Total bandwidth cost of setting up a link is 3 packets totalling 237 bytes
+    - Low cost of keeping links open at only 0.62 bits per second
 
 ## Where can Reticulum be used?
-On practically any hardware that can support at least a half-duplex channel with 1.000 bits per second throughput, and an MTU of 500 bytes. Data radios, modems, LoRa radios, serial lines, AX.25 TNCs, amateur radio digital modes, ad-hoc WiFi, free-space optical links and similar systems are all examples of the types of interfaces Reticulum was designed for.
+Over practically any medium that can support at least a half-duplex channel with 1.000 bits per second throughput, and an MTU of 500 bytes. Data radios, modems, LoRa radios, serial lines, AX.25 TNCs, amateur radio digital modes, ad-hoc WiFi, free-space optical links and similar systems are all examples of the types of interfaces Reticulum was designed for.
 
 An open-source LoRa-based interface called [RNode](https://unsigned.io/projects/rnode/) has been designed specifically for use with Reticulum. It is possible to build yourself, or it can be purchased as a complete transceiver that just needs a USB connection to the host.
 
@@ -70,49 +75,15 @@ Some countries still ban the use of encryption when operating under an amateur r
  - pyserial
 
 ## How do I get started?
-Full documentation and tutorials are coming with the stable alpha release. Until then, you are mostly on your own. If you want to experiment already, you could take a look in the "Examples" folder, for some well-documented example programs. The default configuration file created by Reticulum on the first run is also worth reading. Be sure to also read the [Reticulum Overview Document](http://unsigned.io/wp-content/uploads/2018/04/Reticulum_Overview_v0.4.pdf).
+The best way to get started with the Reticulum Network Stack depends on what
+you want to do. For full details and examples, have a look at the [Getting Started Fast](https://markqvist.github.io/Reticulum/manual/gettingstartedfast.html) section of the [Reticulum Manual](https://markqvist.github.io/Reticulum/manual/).
 
-If you just need Reticulum as a dependency for another application, the easiest way is probably via pip:
+If you just need Reticulum as a dependency for another application, the easiest way is via pip:
 
 ```bash
 pip3 install rns
 ```
 
-For Reticulum development, you might want to get the latest source from GitHub. In that case, don't use pip, but try this recipe:
-
-```bash
-# Install dependencies
-pip3 install cryptography pyserial
-
-# Clone repository
-git clone https://github.com/markqvist/Reticulum.git
-
-# Move into Reticulum folder and symlink library to examples folder
-cd Reticulum
-ln -s ../RNS ./Examples/
-
-# Run an example
-python3 Examples/Echo.py -s
-
-# Unless you've manually created a config file, Reticulum will do so now,
-# and immediately exit. Make any necessary changes to the file:
-nano ~/.reticulum/config
-
-# ... and launch the example again.
-python3 Examples/Echo.py -s
-
-# You can now repeat the process on another computer,
-# and run the same example with -h to get command line options.
-python3 Examples/Echo.py -h
-
-# Run the example in client mode to "ping" the server.
-# Replace the hash below with the actual destination hash of your server.
-python3 Examples/Echo.py 3e12fc71692f8ec47bc5
-
-# Have a look at another example
-python3 Examples/Filetransfer.py -h
-```
-
 The default config file contains examples for using Reticulum with LoRa transceivers (specifically [RNode](https://unsigned.io/projects/rnode/)), packet radio TNCs/modems and UDP. By default a UDP interface is already enabled in the default config, which will enable Reticulum communication in your local ethernet broadcast domain.
 
 You can use the examples in the config file to expand communication over other mediums such as packet radio or LoRa, or over fast IP links using the UDP interface. I'll add in-depth tutorials and explanations on these topics later. For now, the included examples will hopefully be enough to get started.

RNS/Destination.py

@@ -5,9 +5,6 @@ import RNS
 from cryptography.fernet import Fernet
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.primitives import serialization
-from cryptography.hazmat.primitives.asymmetric import rsa
-from cryptography.hazmat.primitives.asymmetric import padding
 
 class Callbacks:
     def __init__(self):
@@ -25,15 +22,12 @@ class Destination:
     encrypted communication with it.
 
     :param identity: An instance of :ref:`RNS.Identity<api-identity>`. Can hold only public keys for an outgoing destination, or holding private keys for an ingoing.
-    :param direction: ``RNS.Destination.IN`` or ``RNS.Destination.OUT``
+    :param direction: ``RNS.Destination.IN`` or ``RNS.Destination.OUT``.
     :param type: ``RNS.Destination.SINGLE``, ``RNS.Destination.GROUP`` or ``RNS.Destination.PLAIN``.
     :param app_name: A string specifying the app name.
     :param \*aspects: Any non-zero number of string arguments.
     """
 
-    KEYSIZE    = RNS.Identity.KEYSIZE;
-    PADDINGSIZE= RNS.Identity.PADDINGSIZE;
-
     # Constants
     SINGLE     = 0x00
     GROUP      = 0x01
@@ -46,6 +40,11 @@ class Destination:
     PROVE_ALL  = 0x23
     proof_strategies = [PROVE_NONE, PROVE_APP, PROVE_ALL]
 
+    ALLOW_NONE = 0x00
+    ALLOW_ALL  = 0x01
+    ALLOW_LIST = 0x02
+    request_policies = [ALLOW_NONE, ALLOW_ALL, ALLOW_LIST]
+
     IN         = 0x11;
     OUT        = 0x12;
     directions = [IN, OUT]
@@ -103,6 +102,7 @@ class Destination:
         if not type in Destination.types: raise ValueError("Unknown destination type")
         if not direction in Destination.directions: raise ValueError("Unknown destination direction")
         self.callbacks = Callbacks()
+        self.request_handlers = {}
         self.type = type
         self.direction = direction
         self.proof_strategy = Destination.PROVE_NONE
@@ -139,8 +139,8 @@ class Destination:
 
     def announce(self, app_data=None, path_response=False):
         """
-        Creates an announce packet for this destination and broadcasts it on
-        all interfaces. Application specific data can be added to the announce.
+        Creates an announce packet for this destination and broadcasts it on all
+        relevant interfaces. Application specific data can be added to the announce.
 
         :param app_data: *bytes* containing the app_data.
         :param path_response: Internal flag used by :ref:`RNS.Transport<api-transport>`. Ignore.
@@ -162,10 +162,7 @@ class Destination:
 
         signature = self.identity.sign(signed_data)
 
-        # TODO: Check if this could be optimised by only
-        # carrying the hash in the destination field, not
-        # also redundantly inside the signed blob as here
-        announce_data = self.hash+self.identity.get_public_key()+random_hash+signature
+        announce_data = self.identity.get_public_key()+random_hash+signature
 
         if app_data != None:
             announce_data += app_data
@@ -178,7 +175,7 @@ class Destination:
         RNS.Packet(self, announce_data, RNS.Packet.ANNOUNCE, context = announce_context).send()
 
 
-    def link_established_callback(self, callback):
+    def set_link_established_callback(self, callback):
         """
         Registers a function to be called when a link has been established to
         this destination.
@@ -187,7 +184,7 @@ class Destination:
         """
         self.callbacks.link_established = callback
 
-    def packet_callback(self, callback):
+    def set_packet_callback(self, callback):
         """
         Registers a function to be called when a packet has been received by
         this destination.
@@ -196,7 +193,7 @@ class Destination:
         """
         self.callbacks.packet = callback
 
-    def proof_requested_callback(self, callback):
+    def set_proof_requested_callback(self, callback):
         """
         Registers a function to be called when a proof has been requested for
         a packet sent to this destination. Allows control over when and if
@@ -217,15 +214,55 @@ class Destination:
         else:
             self.proof_strategy = proof_strategy
 
-    def receive(self, packet):
-        plaintext = self.decrypt(packet.data)
-        if plaintext != None:
-            if packet.packet_type == RNS.Packet.LINKREQUEST:
-                self.incoming_link_request(plaintext, packet)
 
-            if packet.packet_type == RNS.Packet.DATA:
-                if self.callbacks.packet != None:
-                    self.callbacks.packet(plaintext, packet)
+    def register_request_handler(self, path, response_generator = None, allow = ALLOW_NONE, allowed_list = None):
+        """
+        Registers a request handler.
+
+        :param path: The path for the request handler to be registered.
+        :param response_generator: A function or method with the signature *response_generator(path, data, request_id, remote_identity, requested_at)* to be called. Whatever this funcion returns will be sent as a response to the requester. If the function returns ``None``, no response will be sent.
+        :param allow: One of ``RNS.Destination.ALLOW_NONE``, ``RNS.Destination.ALLOW_ALL`` or ``RNS.Destination.ALLOW_LIST``. If ``RNS.Destination.ALLOW_LIST`` is set, the request handler will only respond to requests for identified peers in the supplied list.
+        :param allowed_list: A list of *bytes-like* :ref:`RNS.Identity<api-identity>` hashes.
+        :raises: ``ValueError`` if any of the supplied arguments are invalid.
+        """
+        if path == None or path == "":
+            raise ValueError("Invalid path specified")
+        elif not callable(response_generator):
+            raise ValueError("Invalid response generator specified")
+        elif not allow in Destination.request_policies:
+            raise ValueError("Invalid request policy")
+        else:
+            path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
+            request_handler = [path, response_generator, allow, allowed_list]
+            self.request_handlers[path_hash] = request_handler
+
+
+    def deregister_request_handler(self, path):
+        """
+        Deregisters a request handler.
+
+        :param path: The path for the request handler to be deregistered.
+        :returns: True if the handler was deregistered, otherwise False.
+        """
+        path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
+        if path_hash in self.request_handlers:
+            self.request_handlers.pop(path_hash)
+            return True
+        else:
+            return False
+
+        
+
+    def receive(self, packet):
+        if packet.packet_type == RNS.Packet.LINKREQUEST:
+            plaintext = packet.data
+            self.incoming_link_request(plaintext, packet)
+        else:
+            plaintext = self.decrypt(packet.data)
+            if plaintext != None:
+                if packet.packet_type == RNS.Packet.DATA:
+                    if self.callbacks.packet != None:
+                        self.callbacks.packet(plaintext, packet)
 
     def incoming_link_request(self, data, packet):
         link = RNS.Link.validate_request(self, data, packet)
@@ -245,8 +282,8 @@ class Destination:
             raise TypeError("A single destination holds keys through an Identity instance")
 
         if self.type == Destination.GROUP:
-            self.prv_bytes = Fernet.generate_key()
-            self.prv = Fernet(self.prv_bytes)
+            self.prv_bytes = base64.urlsafe_b64decode(Fernet.generate_key())
+            self.prv = Fernet(base64.urlsafe_b64encode(self.prv_bytes))
 
 
     def get_private_key(self):
@@ -278,7 +315,7 @@ class Destination:
 
         if self.type == Destination.GROUP:
             self.prv_bytes = key
-            self.prv = Fernet(self.prv_bytes)
+            self.prv = Fernet(base64.urlsafe_b64encode(self.prv_bytes))
 
     def load_public_key(self, key):
         if self.type != Destination.SINGLE:

RNS/Identity.py

@@ -4,14 +4,15 @@ import os
 import RNS
 import time
 import atexit
+import base64
 from .vendor import umsgpack as umsgpack
-from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives import serialization
-from cryptography.hazmat.primitives.serialization import load_der_public_key
-from cryptography.hazmat.primitives.serialization import load_der_private_key
-from cryptography.hazmat.primitives.asymmetric import rsa
-from cryptography.hazmat.primitives.asymmetric import padding
+from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey, Ed25519PublicKey
+from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey, X25519PublicKey
+from cryptography.hazmat.primitives.kdf.hkdf import HKDF
+from cryptography.fernet import Fernet
 
 class Identity:
     """
@@ -19,26 +20,30 @@ class Identity:
     for encryption, decryption, signatures and verification, and is the basis
     for all encrypted communication over Reticulum networks.
 
-    :param public_only: Specifies whether this destination only holds a public key.
+    :param create_keys: Specifies whether new encryption and signing keys should be generated.
     """
-    KEYSIZE     = 1024
+
+    CURVE = "Curve25519"
     """
-    RSA key size in bits.
+    The curve used for Elliptic Curve DH key exchanges
     """
-    DERKEYSIZE  = KEYSIZE+272
+
+    KEYSIZE     = 256*2
+    """
+    X25519 key size in bits. A complete key is the concatenation of a 256 bit encryption key, and a 256 bit signing key.
+    """   
 
     # Non-configurable constants
-    PADDINGSIZE = 336       # In bits
-    HASHLENGTH  = 256       # In bits
-    SIGLENGTH   = KEYSIZE
+    FERNET_VERSION   = 0x80
+    FERNET_OVERHEAD  = 54     # In bytes
+    AES128_BLOCKSIZE = 16     # In bytes
+    HASHLENGTH  = 256         # In bits
+    SIGLENGTH   = KEYSIZE     # In bits
 
-    ENCRYPT_CHUNKSIZE = (KEYSIZE-PADDINGSIZE)//8
-    DECRYPT_CHUNKSIZE = KEYSIZE//8
-
-    TRUNCATED_HASHLENGTH = 80 # In bits
+    TRUNCATED_HASHLENGTH = RNS.Reticulum.TRUNCATED_HASHLENGTH
     """
     Constant specifying the truncated hash length (in bits) used by Reticulum
-    for addressable hashes. Non-configurable.
+    for addressable hashes and other purposes. Non-configurable.
     """
 
     # Storage
@@ -46,7 +51,10 @@ class Identity:
 
     @staticmethod
     def remember(packet_hash, destination_hash, public_key, app_data = None):
-        Identity.known_destinations[destination_hash] = [time.time(), packet_hash, public_key, app_data]
+        if len(public_key) != Identity.KEYSIZE//8:
+            raise TypeError("Can't remember "+RNS.prettyhexrep(destination_hash)+", the public key size of "+str(len(public_key))+" is not valid.", RNS.LOG_ERROR)
+        else:
+            Identity.known_destinations[destination_hash] = [time.time(), packet_hash, public_key, app_data]
 
 
     @staticmethod
@@ -57,16 +65,13 @@ class Identity:
         :param destination_hash: Destination hash as *bytes*.
         :returns: An :ref:`RNS.Identity<api-identity>` instance that can be used to create an outgoing :ref:`RNS.Destination<api-destination>`, or *None* if the destination is unknown.
         """
-        RNS.log("Searching for "+RNS.prettyhexrep(destination_hash)+"...", RNS.LOG_EXTREME)
         if destination_hash in Identity.known_destinations:
             identity_data = Identity.known_destinations[destination_hash]
-            identity = Identity(public_only=True)
+            identity = Identity(create_keys=False)
             identity.load_public_key(identity_data[2])
             identity.app_data = identity_data[3]
-            RNS.log("Found "+RNS.prettyhexrep(destination_hash)+" in known destinations", RNS.LOG_EXTREME)
             return identity
         else:
-            RNS.log("Could not find "+RNS.prettyhexrep(destination_hash)+" in known destinations", RNS.LOG_EXTREME)
             return None
 
     @staticmethod
@@ -77,13 +82,10 @@ class Identity:
         :param destination_hash: Destination hash as *bytes*.
         :returns: *Bytes* containing app_data, or *None* if the destination is unknown.
         """
-        RNS.log("Searching for app_data for "+RNS.prettyhexrep(destination_hash)+"...", RNS.LOG_EXTREME)
         if destination_hash in Identity.known_destinations:
             app_data = Identity.known_destinations[destination_hash][3]
-            RNS.log("Found "+RNS.prettyhexrep(destination_hash)+" app_data in known destinations", RNS.LOG_EXTREME)
             return app_data
         else:
-            RNS.log("Could not find "+RNS.prettyhexrep(destination_hash)+" app_data in known destinations", RNS.LOG_EXTREME)
             return None
 
     @staticmethod
@@ -145,19 +147,19 @@ class Identity:
         if packet.packet_type == RNS.Packet.ANNOUNCE:
             RNS.log("Validating announce from "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_DEBUG)
             destination_hash = packet.destination_hash
-            public_key = packet.data[10:Identity.DERKEYSIZE//8+10]
-            random_hash = packet.data[Identity.DERKEYSIZE//8+10:Identity.DERKEYSIZE//8+20]
-            signature = packet.data[Identity.DERKEYSIZE//8+20:Identity.DERKEYSIZE//8+20+Identity.KEYSIZE//8]
+            public_key = packet.data[:Identity.KEYSIZE//8]
+            random_hash = packet.data[Identity.KEYSIZE//8:Identity.KEYSIZE//8+10]
+            signature = packet.data[Identity.KEYSIZE//8+10:Identity.KEYSIZE//8+10+Identity.KEYSIZE//8]
             app_data = b""
-            if len(packet.data) > Identity.DERKEYSIZE//8+20+Identity.KEYSIZE//8:
-                app_data = packet.data[Identity.DERKEYSIZE//8+20+Identity.KEYSIZE//8:]
+            if len(packet.data) > Identity.KEYSIZE//8+10+Identity.KEYSIZE//8:
+                app_data = packet.data[Identity.KEYSIZE//8+10+Identity.KEYSIZE//8:]
 
             signed_data = destination_hash+public_key+random_hash+app_data
 
-            if not len(packet.data) > Identity.DERKEYSIZE//8+20+Identity.KEYSIZE//8:
+            if not len(packet.data) > Identity.KEYSIZE//8+10+Identity.KEYSIZE//8:
                 app_data = None
 
-            announced_identity = Identity(public_only=True)
+            announced_identity = Identity(create_keys=False)
             announced_identity.load_public_key(public_key)
 
             if announced_identity.pub != None and announced_identity.validate(signature, signed_data):
@@ -175,6 +177,22 @@ class Identity:
         Identity.save_known_destinations()
 
 
+    @staticmethod
+    def from_bytes(prv_bytes):
+        """
+        Create a new :ref:`RNS.Identity<api-identity>` instance from *bytes* of private key.
+        Can be used to load previously created and saved identities into Reticulum.
+
+        :param prv_bytes: The *bytes* of private a saved private key. **HAZARD!** Never use this to generate a new key by feeding random data in prv_bytes.
+        :returns: A :ref:`RNS.Identity<api-identity>` instance, or *None* if the *bytes* data was invalid.
+        """
+        identity = Identity(create_keys=False)
+        if identity.load_private_key(prv_bytes):
+            return identity
+        else:
+            return None
+
+
     @staticmethod
     def from_file(path):
         """
@@ -184,104 +202,12 @@ class Identity:
         :param path: The full path to the saved :ref:`RNS.Identity<api-identity>` data
         :returns: A :ref:`RNS.Identity<api-identity>` instance, or *None* if the loaded data was invalid.
         """
-        identity = Identity(public_only=True)
+        identity = Identity(create_keys=False)
         if identity.load(path):
             return identity
         else:
             return None
 
-
-    def __init__(self,public_only=False):
-        # Initialize keys to none
-        self.prv = None
-        self.pub = None
-        self.prv_bytes = None
-        self.pub_bytes = None
-        self.hash = None
-        self.hexhash = None
-
-        if not public_only:
-            self.create_keys()
-
-    def create_keys(self):
-        self.prv = rsa.generate_private_key(
-            public_exponent=65537,
-            key_size=Identity.KEYSIZE,
-            backend=default_backend()
-        )
-        self.prv_bytes = self.prv.private_bytes(
-            encoding=serialization.Encoding.DER,
-            format=serialization.PrivateFormat.PKCS8,
-            encryption_algorithm=serialization.NoEncryption()
-        )
-        self.pub = self.prv.public_key()
-        self.pub_bytes = self.pub.public_bytes(
-            encoding=serialization.Encoding.DER,
-            format=serialization.PublicFormat.SubjectPublicKeyInfo
-        )
-
-        self.update_hashes()
-
-        RNS.log("Identity keys created for "+RNS.prettyhexrep(self.hash), RNS.LOG_VERBOSE)
-
-    def get_private_key(self):
-        """
-        :returns: The private key as *bytes*
-        """
-        return self.prv_bytes
-
-    def get_public_key(self):
-        """
-        :returns: The public key as *bytes*
-        """
-        return self.pub_bytes
-
-    def load_private_key(self, prv_bytes):
-        """
-        Load a private key into the instance.
-
-        :param prv_bytes: The private key as *bytes*.
-        :returns: True if the key was loaded, otherwise False.
-        """
-        try:
-            self.prv_bytes = prv_bytes
-            self.prv = serialization.load_der_private_key(
-                self.prv_bytes,
-                password=None,
-                backend=default_backend()
-            )
-            self.pub = self.prv.public_key()
-            self.pub_bytes = self.pub.public_bytes(
-                encoding=serialization.Encoding.DER,
-                format=serialization.PublicFormat.SubjectPublicKeyInfo
-            )
-            self.update_hashes()
-
-            return True
-
-        except Exception as e:
-            RNS.log("Failed to load identity key", RNS.LOG_ERROR)
-            RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
-            return False
-
-    def load_public_key(self, key):
-        """
-        Load a public key into the instance.
-
-        :param prv_bytes: The public key as *bytes*.
-        :returns: True if the key was loaded, otherwise False.
-        """
-        try:
-            self.pub_bytes = key
-            self.pub = load_der_public_key(self.pub_bytes, backend=default_backend())
-            self.update_hashes()
-        except Exception as e:
-            RNS.log("Error while loading public key, the contained exception was: "+str(e), RNS.LOG_ERROR)
-
-    def update_hashes(self):
-        self.hash = Identity.truncated_hash(self.pub_bytes)
-        self.hexhash = self.hash.hex()
-
     def to_file(self, path):
         """
         Saves the identity to a file. This will write the private key to disk,
@@ -293,13 +219,131 @@ class Identity:
         """
         try:
             with open(path, "wb") as key_file:
-                key_file.write(self.prv_bytes)
+                key_file.write(self.get_private_key())
                 return True
             return False
         except Exception as e:
             RNS.log("Error while saving identity to "+str(path), RNS.LOG_ERROR)
             RNS.log("The contained exception was: "+str(e))
 
+    def __init__(self,create_keys=True):
+        # Initialize keys to none
+        self.prv           = None
+        self.prv_bytes     = None
+        self.sig_prv       = None
+        self.sig_prv_bytes = None
+
+        self.pub           = None
+        self.pub_bytes     = None
+        self.sig_pub       = None
+        self.sig_pub_bytes = None
+
+        self.hash          = None
+        self.hexhash       = None
+
+        if create_keys:
+            self.create_keys()
+
+    def create_keys(self):
+        self.prv           = X25519PrivateKey.generate()
+        self.prv_bytes     = self.prv.private_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PrivateFormat.Raw,
+            encryption_algorithm=serialization.NoEncryption()
+        )
+
+        self.sig_prv       = Ed25519PrivateKey.generate()
+        self.sig_prv_bytes = self.sig_prv.private_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PrivateFormat.Raw,
+            encryption_algorithm=serialization.NoEncryption()
+        )
+
+        self.pub           = self.prv.public_key()
+        self.pub_bytes     = self.pub.public_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PublicFormat.Raw
+        )
+
+        self.sig_pub       = self.sig_prv.public_key()
+        self.sig_pub_bytes = self.sig_pub.public_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PublicFormat.Raw
+        )
+
+        self.update_hashes()
+
+        RNS.log("Identity keys created for "+RNS.prettyhexrep(self.hash), RNS.LOG_VERBOSE)
+
+    def get_private_key(self):
+        """
+        :returns: The private key as *bytes*
+        """
+        return self.prv_bytes+self.sig_prv_bytes
+
+    def get_public_key(self):
+        """
+        :returns: The public key as *bytes*
+        """
+        return self.pub_bytes+self.sig_pub_bytes
+
+    def load_private_key(self, prv_bytes):
+        """
+        Load a private key into the instance.
+
+        :param prv_bytes: The private key as *bytes*.
+        :returns: True if the key was loaded, otherwise False.
+        """
+        try:
+            self.prv_bytes     = prv_bytes[:Identity.KEYSIZE//8//2]
+            self.prv           = X25519PrivateKey.from_private_bytes(self.prv_bytes)
+            self.sig_prv_bytes = prv_bytes[Identity.KEYSIZE//8//2:]
+            self.sig_prv       = Ed25519PrivateKey.from_private_bytes(self.sig_prv_bytes)
+            
+            self.pub           = self.prv.public_key()
+            self.pub_bytes     = self.pub.public_bytes(
+                encoding=serialization.Encoding.Raw,
+                format=serialization.PublicFormat.Raw
+            )
+
+            self.sig_pub       = self.sig_prv.public_key()
+            self.sig_pub_bytes = self.sig_pub.public_bytes(
+                encoding=serialization.Encoding.Raw,
+                format=serialization.PublicFormat.Raw
+            )
+
+            self.update_hashes()
+
+            return True
+
+        except Exception as e:
+            raise e
+            RNS.log("Failed to load identity key", RNS.LOG_ERROR)
+            RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
+            return False
+
+    def load_public_key(self, pub_bytes):
+        """
+        Load a public key into the instance.
+
+        :param pub_bytes: The public key as *bytes*.
+        :returns: True if the key was loaded, otherwise False.
+        """
+        try:
+            self.pub_bytes     = pub_bytes[:Identity.KEYSIZE//8//2]
+            self.sig_pub_bytes = pub_bytes[Identity.KEYSIZE//8//2:]
+
+            self.pub           = X25519PublicKey.from_public_bytes(self.pub_bytes)
+            self.sig_pub       = Ed25519PublicKey.from_public_bytes(self.sig_pub_bytes)
+
+            self.update_hashes()
+        except Exception as e:
+            RNS.log("Error while loading public key, the contained exception was: "+str(e), RNS.LOG_ERROR)
+
+    def update_hashes(self):
+        self.hash = Identity.truncated_hash(self.get_public_key())
+        self.hexhash = self.hash.hex()
+
     def load(self, path):
         try:
             with open(path, "rb") as key_file:
@@ -310,71 +354,78 @@ class Identity:
             RNS.log("Error while loading identity from "+str(path), RNS.LOG_ERROR)
             RNS.log("The contained exception was: "+str(e))
 
+    def get_salt(self):
+        return self.hash
+
+    def get_context(self):
+        return None
+
     def encrypt(self, plaintext):
         """
         Encrypts information for the identity.
 
         :param plaintext: The plaintext to be encrypted as *bytes*.
-        :returns: Ciphertext as *bytes*.
-        :raises: *KeyError* if the instance does not hold a public key
+        :returns: Ciphertext token as *bytes*.
+        :raises: *KeyError* if the instance does not hold a public key.
         """
         if self.pub != None:
-            chunksize = Identity.ENCRYPT_CHUNKSIZE
-            chunks = int(math.ceil(len(plaintext)/(float(chunksize))))
+            ephemeral_key = X25519PrivateKey.generate()
+            ephemeral_pub_bytes = ephemeral_key.public_key().public_bytes(
+                encoding=serialization.Encoding.Raw,
+                format=serialization.PublicFormat.Raw
+            )
 
-            ciphertext = b"";
-            for chunk in range(chunks):
-                start = chunk*chunksize
-                end = (chunk+1)*chunksize
-                if (chunk+1)*chunksize > len(plaintext):
-                    end = len(plaintext)
-                
-                ciphertext += self.pub.encrypt(
-                    plaintext[start:end],
-                    padding.OAEP(
-                        mgf=padding.MGF1(algorithm=hashes.SHA1()),
-                        algorithm=hashes.SHA1(),
-                        label=None
-                    )
-                )
-            return ciphertext
+            shared_key = ephemeral_key.exchange(self.pub)
+            derived_key = derived_key = HKDF(
+                algorithm=hashes.SHA256(),
+                length=32,
+                salt=self.get_salt(),
+                info=self.get_context(),
+            ).derive(shared_key)
+
+            fernet = Fernet(base64.urlsafe_b64encode(derived_key))
+            ciphertext = base64.urlsafe_b64decode(fernet.encrypt(plaintext))
+            token = ephemeral_pub_bytes+ciphertext
+
+            return token
         else:
             raise KeyError("Encryption failed because identity does not hold a public key")
 
 
-    def decrypt(self, ciphertext):
+    def decrypt(self, ciphertext_token):
         """
         Decrypts information for the identity.
 
         :param ciphertext: The ciphertext to be decrypted as *bytes*.
         :returns: Plaintext as *bytes*, or *None* if decryption fails.
-        :raises: *KeyError* if the instance does not hold a private key
+        :raises: *KeyError* if the instance does not hold a private key.
         """
         if self.prv != None:
-            plaintext = None
-            try:
-                chunksize = Identity.DECRYPT_CHUNKSIZE
-                chunks = int(math.ceil(len(ciphertext)/(float(chunksize))))
+            if len(ciphertext_token) > Identity.KEYSIZE//8//2:
+                plaintext = None
+                try:
+                    peer_pub_bytes = ciphertext_token[:Identity.KEYSIZE//8//2]
+                    peer_pub = X25519PublicKey.from_public_bytes(peer_pub_bytes)
 
-                plaintext = b"";
-                for chunk in range(chunks):
-                    start = chunk*chunksize
-                    end = (chunk+1)*chunksize
-                    if (chunk+1)*chunksize > len(ciphertext):
-                        end = len(ciphertext)
+                    shared_key = self.prv.exchange(peer_pub)
+                    derived_key = derived_key = HKDF(
+                        algorithm=hashes.SHA256(),
+                        length=32,
+                        salt=self.get_salt(),
+                        info=self.get_context(),
+                    ).derive(shared_key)
 
-                    plaintext += self.prv.decrypt(
-                        ciphertext[start:end],
-                        padding.OAEP(
-                            mgf=padding.MGF1(algorithm=hashes.SHA1()),
-                            algorithm=hashes.SHA1(),
-                            label=None
-                        )
-                    )
-            except:
-                RNS.log("Decryption by "+RNS.prettyhexrep(self.hash)+" failed", RNS.LOG_VERBOSE)
-                
-            return plaintext;
+                    fernet = Fernet(base64.urlsafe_b64encode(derived_key))
+                    ciphertext = ciphertext_token[Identity.KEYSIZE//8//2:]
+                    plaintext = fernet.decrypt(base64.urlsafe_b64encode(ciphertext))
+
+                except Exception as e:
+                    RNS.log("Decryption by "+RNS.prettyhexrep(self.hash)+" failed: "+str(e), RNS.LOG_DEBUG)
+                    
+                return plaintext;
+            else:
+                RNS.log("Decryption failed because the token size was invalid.", RNS.LOG_DEBUG)
+                return None
         else:
             raise KeyError("Decryption failed because identity does not hold a private key")
 
@@ -385,18 +436,14 @@ class Identity:
 
         :param message: The message to be signed as *bytes*.
         :returns: Signature as *bytes*.
-        :raises: *KeyError* if the instance does not hold a private key
+        :raises: *KeyError* if the instance does not hold a private key.
         """
-        if self.prv != None:
-            signature = self.prv.sign(
-                message,
-                padding.PSS(
-                    mgf=padding.MGF1(hashes.SHA256()),
-                    salt_length=padding.PSS.MAX_LENGTH
-                ),
-                hashes.SHA256()
-            )
-            return signature
+        if self.sig_prv != None:
+            try:
+                return self.sig_prv.sign(message)    
+            except Exception as e:
+                RNS.log("The identity "+str(self)+" could not sign the requested message. The contained exception was: "+str(e), RNS.LOG_ERROR)
+                raise e 
         else:
             raise KeyError("Signing failed because identity does not hold a private key")
 
@@ -407,19 +454,11 @@ class Identity:
         :param signature: The signature to be validated as *bytes*.
         :param message: The message to be validated as *bytes*.
         :returns: True if the signature is valid, otherwise False.
-        :raises: *KeyError* if the instance does not hold a public key
+        :raises: *KeyError* if the instance does not hold a public key.
         """
         if self.pub != None:
             try:
-                self.pub.verify(
-                    signature,
-                    message,
-                    padding.PSS(
-                        mgf=padding.MGF1(hashes.SHA256()),
-                        salt_length=padding.PSS.MAX_LENGTH
-                    ),
-                    hashes.SHA256()
-                )
+                self.sig_pub.verify(signature, message)
                 return True
             except Exception as e:
                 return False

RNS/Interfaces/AX25KISSInterface.py

@@ -62,13 +62,12 @@ class AX25KISSInterface(Interface):
         self.stopbits = stopbits
         self.timeout  = 100
         self.online   = False
-        # TODO: Sane default and make this configurable
-        # TODO: Changed to 25ms instead of 100ms, check it
-        self.txdelay  = 0.025
 
         self.packet_queue    = []
         self.flow_control    = flow_control
         self.interface_ready = False
+        self.flow_control_timeout = 5
+        self.flow_control_locked  = time.time()
 
         if (len(self.src_call) < 3 or len(self.src_call) > 6):
             raise ValueError("Invalid callsign for "+str(self))
@@ -197,6 +196,7 @@ class AX25KISSInterface(Interface):
             if self.interface_ready:
                 if self.flow_control:
                     self.interface_ready = False
+                    self.flow_control_locked = time.time()
 
                 encoded_dst_ssid = bytes([0x60 | (self.dst_ssid << 1)])
                 encoded_src_ssid = bytes([0x60 | (self.src_ssid << 1) | 0x01])
@@ -223,10 +223,6 @@ class AX25KISSInterface(Interface):
                 data = data.replace(bytes([0xc0]), bytes([0xdb])+bytes([0xdc]))
                 kiss_frame = bytes([KISS.FEND])+bytes([0x00])+data+bytes([KISS.FEND])
 
-                if (self.txdelay > 0):
-                    RNS.log(str(self.name)+" delaying TX for "+str(self.txdelay)+" seconds", RNS.LOG_EXTREME)
-                    sleep(self.txdelay)
-
                 written = self.serial.write(kiss_frame)
                 if written != len(kiss_frame):
                     if self.flow_control:
@@ -294,7 +290,13 @@ class AX25KISSInterface(Interface):
                         in_frame = False
                         command = KISS.CMD_UNKNOWN
                         escape = False
-                    sleep(0.08)
+                    sleep(0.05)
+
+                    if self.flow_control:
+                        if not self.interface_ready:
+                            if time.time() > self.flow_control_locked + self.flow_control_timeout:
+                                RNS.log("Interface "+str(self)+" is unlocking flow control due to time-out. This should not happen. Your hardware might have missed a flow-control READY command, or maybe it does not support flow-control.", RNS.LOG_WARNING)
+                                self.process_queue()
 
         except Exception as e:
             self.online = False

RNS/Interfaces/Interface.py

@@ -11,5 +11,4 @@ class Interface:
         pass
 
     def get_hash(self):
-        # TODO: Maybe expand this to something more unique
         return RNS.Identity.full_hash(str(self).encode("utf-8"))

RNS/Interfaces/KISSInterface.py

@@ -60,7 +60,7 @@ class KISSInterface(Interface):
         self.packet_queue    = []
         self.flow_control    = flow_control
         self.interface_ready = False
-        self.flow_control_timeout = 10
+        self.flow_control_timeout = 5
         self.flow_control_locked  = time.time()
 
         self.preamble    = preamble if preamble != None else 350;
@@ -259,12 +259,12 @@ class KISSInterface(Interface):
                         in_frame = False
                         command = KISS.CMD_UNKNOWN
                         escape = False
-                    sleep(0.08)
+                    sleep(0.05)
 
                     if self.flow_control:
                         if not self.interface_ready:
                             if time.time() > self.flow_control_locked + self.flow_control_timeout:
-                                RNS.log("Interface "+str(self)+" is unlocking flow control due to time-out. This should not happen. Your hardware might have missed a flow-control READY command.", RNS.LOG_WARNING)
+                                RNS.log("Interface "+str(self)+" is unlocking flow control due to time-out. This should not happen. Your hardware might have missed a flow-control READY command, or maybe it does not support flow-control.", RNS.LOG_WARNING)
                                 self.process_queue()
 
                     if self.beacon_i != None and self.beacon_d != None:

RNS/Interfaces/TCPInterface.py

@@ -1,6 +1,7 @@
 from .Interface import Interface
 import socketserver
 import threading
+import netifaces
 import socket
 import time
 import sys
@@ -127,12 +128,21 @@ class TCPClientInterface(Interface):
 
 
 class TCPServerInterface(Interface):
+    @staticmethod
+    def get_address_for_if(name):
+        return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['addr']
 
-    def __init__(self, owner, name, bindip=None, bindport=None):
+    def get_broadcast_for_if(name):
+        return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['broadcast']
+
+    def __init__(self, owner, name, device=None, bindip=None, bindport=None):
         self.IN  = True
         self.OUT = False
         self.name = name
 
+        if device != None:
+            bindip = TCPServerInterface.get_address_for_if(device)
+
         if (bindip != None and bindport != None):
             self.receives = True
             self.bind_ip = bindip

RNS/Interfaces/UDPInterface.py

@@ -1,18 +1,34 @@
 from .Interface import Interface
 import socketserver
 import threading
+import netifaces
 import socket
 import time
 import sys
 import RNS
 
+
 class UDPInterface(Interface):
 
-    def __init__(self, owner, name, bindip=None, bindport=None, forwardip=None, forwardport=None):
+    @staticmethod
+    def get_address_for_if(name):
+        return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['addr']
+
+    def get_broadcast_for_if(name):
+        return netifaces.ifaddresses(name)[netifaces.AF_INET][0]['broadcast']
+
+    def __init__(self, owner, name, device=None, bindip=None, bindport=None, forwardip=None, forwardport=None):
         self.IN  = True
         self.OUT = False
         self.name = name
 
+        if device != None:
+            if bindip == None:
+                bindip = UDPInterface.get_broadcast_for_if(device)
+            if forwardip == None:
+                forwardip = UDPInterface.get_broadcast_for_if(device)
+
+
         if (bindip != None and bindport != None):
             self.receives = True
             self.bind_ip = bindip

RNS/Link.py

@@ -23,38 +23,41 @@ class LinkCallbacks:
         self.resource = None
         self.resource_started = None
         self.resource_concluded = None
+        self.remote_identified = None
 
 class Link:
     """
-    This class.
+    This class is used to establish and manage links to other peers. When a
+    link instance is created, Reticulum will attempt to establish verified
+    connectivity with the specified destination.
 
     :param destination: A :ref:`RNS.Destination<api-destination>` instance which to establish a link to.
-    :param owner: Internal use by :ref:`RNS.Transport<api-Transport>`, ignore this argument.
-    :param peer_pub_bytes: Internal use, ignore this argument.
-    :param peer_sig_pub_bytes: Internal use, ignore this argument.
+    :param established_callback: An optional function or method with the signature *callback(link)* to be called when the link has been established.
+    :param closed_callback: An optional function or method with the signature *callback(link)* to be called when the link is closed.
     """
-    CURVE = "Curve25519"
+    CURVE = RNS.Identity.CURVE
     """
     The curve used for Elliptic Curve DH key exchanges
     """
 
-    ECPUBSIZE = 32+32
-    BLOCKSIZE = 16
-    KEYSIZE   = 32
+    ECPUBSIZE         = 32+32
+    KEYSIZE           = 32
 
-    AES_HMAC_OVERHEAD = 58
-    MDU = math.floor((RNS.Reticulum.MDU-AES_HMAC_OVERHEAD)/BLOCKSIZE)*BLOCKSIZE - 1
+    MDU = math.floor((RNS.Reticulum.MTU-RNS.Reticulum.HEADER_MINSIZE-RNS.Identity.FERNET_OVERHEAD)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
 
-    # TODO: This should not be hardcoded,
-    # but calculated from something like 
-    # first-hop RTT latency and distance 
-    DEFAULT_TIMEOUT = 15.0
+    # This value is set at a reasonable level for a 1 Kb/s channel.
+    #
+    # TODO: Find a way to automatically raise or lower this according to
+    # channel bandwidth and utilisation.
+    ESTABLISHMENT_TIMEOUT_PER_HOP = 5
     """
-    Default timeout for link establishment in seconds.
+    Default timeout for link establishment in seconds per hop to destination.
     """
-    TIMEOUT_FACTOR = 3
+
+    TRAFFIC_TIMEOUT_FACTOR = 6
+    KEEPALIVE_TIMEOUT_FACTOR = 4
     STALE_GRACE = 2
-    KEEPALIVE = 180
+    KEEPALIVE = 360
     """
     Interval for sending keep-alive packets on established links in seconds.
     """
@@ -81,6 +84,7 @@ class Link:
                 link = Link(owner = owner, peer_pub_bytes=data[:Link.ECPUBSIZE//2], peer_sig_pub_bytes=data[Link.ECPUBSIZE//2:Link.ECPUBSIZE])
                 link.set_link_id(packet)
                 link.destination = packet.destination
+                link.establishment_timeout = Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, packet.hops)
                 RNS.log("Validating link request "+RNS.prettyhexrep(link.link_id), RNS.LOG_VERBOSE)
                 link.handshake()
                 link.attached_interface = packet.receiving_interface
@@ -89,11 +93,6 @@ class Link:
                 RNS.Transport.register_link(link)
                 link.last_inbound = time.time()
                 link.start_watchdog()
-
-                # TODO: Why was link_established callback here? Seems weird
-                # to call this before RTT packet has been received
-                #if self.owner.callbacks.link_established != None:
-                #   self.owner.callbacks.link_established(link)
                 
                 RNS.log("Incoming link request "+str(link)+" accepted", RNS.LOG_VERBOSE)
                 return link
@@ -108,7 +107,7 @@ class Link:
             return None
 
 
-    def __init__(self, destination=None, owner=None, peer_pub_bytes = None, peer_sig_pub_bytes = None):
+    def __init__(self, destination=None, established_callback = None, closed_callback = None, owner=None, peer_pub_bytes = None, peer_sig_pub_bytes = None):
         if destination != None and destination.type != RNS.Destination.SINGLE:
             raise TypeError("Links can only be established to the \"single\" destination type")
         self.rtt = None
@@ -116,15 +115,15 @@ class Link:
         self.resource_strategy = Link.ACCEPT_NONE
         self.outgoing_resources = []
         self.incoming_resources = []
+        self.pending_requests   = []
         self.last_inbound = 0
         self.last_outbound = 0
         self.tx = 0
         self.rx = 0
         self.txbytes = 0
         self.rxbytes = 0
-        self.default_timeout = Link.DEFAULT_TIMEOUT
-        self.proof_timeout = self.default_timeout
-        self.timeout_factor = Link.TIMEOUT_FACTOR
+        self.traffic_timeout_factor = Link.TRAFFIC_TIMEOUT_FACTOR
+        self.keepalive_timeout_factor = Link.KEEPALIVE_TIMEOUT_FACTOR
         self.keepalive = Link.KEEPALIVE
         self.watchdog_lock = False
         self.status = Link.PENDING
@@ -132,17 +131,19 @@ class Link:
         self.owner = owner
         self.destination = destination
         self.attached_interface = None
-        self.__encryption_disabled = False
+        self.__remote_identity = None
         if self.destination == None:
             self.initiator = False
+            self.prv     = self.owner.identity.prv
+            self.sig_prv = self.owner.identity.sig_prv
         else:
             self.initiator = True
+            self.establishment_timeout = Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, RNS.Transport.hops_to(destination.hash))
+            self.prv     = X25519PrivateKey.generate()
+            self.sig_prv = Ed25519PrivateKey.generate()
 
         self.fernet  = None
         
-        self.prv     = X25519PrivateKey.generate()
-        self.sig_prv = Ed25519PrivateKey.generate()
-        
         self.pub = self.prv.public_key()
         self.pub_bytes = self.pub.public_bytes(
             encoding=serialization.Encoding.Raw,
@@ -161,11 +162,21 @@ class Link:
         else:
             self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
 
+        if established_callback != None:
+            self.set_link_established_callback(established_callback)
+
+        if closed_callback != None:
+            self.set_link_closed_callback(closed_callback)
+
         if (self.initiator):
+            peer_pub_bytes = self.destination.identity.get_public_key()[:Link.ECPUBSIZE//2]
+            peer_sig_pub_bytes = self.destination.identity.get_public_key()[Link.ECPUBSIZE//2:Link.ECPUBSIZE]
             self.request_data = self.pub_bytes+self.sig_pub_bytes
             self.packet = RNS.Packet(destination, self.request_data, packet_type=RNS.Packet.LINKREQUEST)
             self.packet.pack()
             self.set_link_id(self.packet)
+            self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
+            self.handshake()
             RNS.Transport.register_link(self)
             self.request_time = time.time()
             self.start_watchdog()
@@ -202,7 +213,7 @@ class Link:
         signed_data = self.link_id+self.pub_bytes+self.sig_pub_bytes
         signature = self.owner.identity.sign(signed_data)
 
-        proof_data = self.pub_bytes+self.sig_pub_bytes+signature
+        proof_data = signature
         proof = RNS.Packet(self, proof_data, packet_type=RNS.Packet.PROOF, context=RNS.Packet.LRPROOF)
         proof.send()
         self.had_outbound()
@@ -221,32 +232,98 @@ class Link:
         self.had_outbound()
 
     def validate_proof(self, packet):
-        if self.initiator and len(packet.data) == Link.ECPUBSIZE+RNS.Identity.KEYSIZE//8:
-            peer_pub_bytes = packet.data[:Link.ECPUBSIZE//2]
-            peer_sig_pub_bytes = packet.data[Link.ECPUBSIZE//2:Link.ECPUBSIZE]
-            signed_data = self.link_id+peer_pub_bytes+peer_sig_pub_bytes
-            signature = packet.data[Link.ECPUBSIZE:RNS.Identity.KEYSIZE//8+Link.ECPUBSIZE]
+        if self.status == Link.HANDSHAKE:
+            if self.initiator and len(packet.data) == RNS.Identity.SIGLENGTH//8:
+                signed_data = self.link_id+self.peer_pub_bytes+self.peer_sig_pub_bytes
+                signature = packet.data[:RNS.Identity.SIGLENGTH//8]
+                
+                if self.destination.identity.validate(signature, signed_data):
+                    self.rtt = time.time() - self.request_time
+                    self.attached_interface = packet.receiving_interface
+                    self.__remote_identity = self.destination.identity
+                    RNS.Transport.activate_link(self)
+                    RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(self.rtt), RNS.LOG_VERBOSE)
+                    rtt_data = umsgpack.packb(self.rtt)
+                    rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
+                    rtt_packet.send()
+                    self.had_outbound()
 
-            if self.destination.identity.validate(signature, signed_data):
-                self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
-                self.handshake()
-                self.rtt = time.time() - self.request_time
-                self.attached_interface = packet.receiving_interface
-                RNS.Transport.activate_link(self)
-                RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(self.rtt), RNS.LOG_VERBOSE)
-                rtt_data = umsgpack.packb(self.rtt)
-                rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
-                RNS.log("Sending RTT packet", RNS.LOG_EXTREME);
-                rtt_packet.send()
-                self.had_outbound()
+                    self.status = Link.ACTIVE
+                    if self.callbacks.link_established != None:
+                        thread = threading.Thread(target=self.callbacks.link_established, args=(self,))
+                        thread.setDaemon(True)
+                        thread.start()
+                else:
+                    RNS.log("Invalid link proof signature received by "+str(self)+". Ignoring.", RNS.LOG_DEBUG)
 
-                self.status = Link.ACTIVE
-                if self.callbacks.link_established != None:
-                    thread = threading.Thread(target=self.callbacks.link_established, args=(self,))
-                    thread.setDaemon(True)
-                    thread.start()
+
+    def identify(self, identity):
+        """
+        Identifies the initiator of the link to the remote peer. This can only happen
+        once the link has been established, and is carried out over the encrypted link.
+        The identity is only revealed to the remote peer, and initiator anonymity is
+        thus preserved. This method can be used for authentication.
+
+        :param identity: An RNS.Identity instance to identify as.
+        """
+        if self.initiator:
+            signed_data = self.link_id + identity.get_public_key()
+            signature = identity.sign(signed_data)
+            proof_data = identity.get_public_key() + signature
+
+            proof = RNS.Packet(self, proof_data, RNS.Packet.DATA, context = RNS.Packet.LINKIDENTIFY)
+            proof.send()
+            self.had_outbound()
+
+
+    def request(self, path, data = None, response_callback = None, failed_callback = None, progress_callback = None, timeout = None):
+        """
+        Sends a request to the remote peer.
+
+        :param path: The request path.
+        :param response_callback: An optional function or method with the signature *response_callback(request_receipt)* to be called when a response is received. See the :ref:`Request Example<example-request>` for more info.
+        :param failed_callback: An optional function or method with the signature *failed_callback(request_receipt)* to be called when a request fails. See the :ref:`Request Example<example-request>` for more info.
+        :param progress_callback: An optional function or method with the signature *progress_callback(request_receipt)* to be called when progress is made receiving the response. Progress can be accessed as a float between 0.0 and 1.0 by the *request_receipt.progress* property.
+        :param timeout: An optional timeout in seconds for the request. If *None* is supplied it will be calculated based on link RTT.
+        :returns: A :ref:`RNS.RequestReceipt<api-requestreceipt>` instance if the request was sent, or *False* if it was not.
+        """
+        request_path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
+        unpacked_request  = [time.time(), request_path_hash, data]
+        packed_request    = umsgpack.packb(unpacked_request)
+
+        if timeout == None:
+            timeout = self.rtt * self.traffic_timeout_factor + RNS.Resource.RESPONSE_MAX_GRACE_TIME
+
+        if len(packed_request) <= Link.MDU:
+            request_packet   = RNS.Packet(self, packed_request, RNS.Packet.DATA, context = RNS.Packet.REQUEST)
+            packet_receipt   = request_packet.send()
+
+            if packet_receipt == False:
+                return False
             else:
-                RNS.log("Invalid link proof signature received by "+str(self)+". Ignoring.", RNS.LOG_DEBUG)
+                packet_receipt.set_timeout(timeout)
+                return RequestReceipt(
+                    self,
+                    packet_receipt = packet_receipt,
+                    response_callback = response_callback,
+                    failed_callback = failed_callback,
+                    progress_callback = progress_callback,
+                    timeout = timeout
+                )
+            
+        else:
+            request_id = RNS.Identity.truncated_hash(packed_request)
+            RNS.log("Sending request "+RNS.prettyhexrep(request_id)+" as resource.", RNS.LOG_DEBUG)
+            request_resource = RNS.Resource(packed_request, self, request_id = request_id, is_response = False, timeout = timeout)
+
+            return RequestReceipt(
+                self,
+                resource = request_resource,
+                response_callback = response_callback,
+                failed_callback = failed_callback,
+                progress_callback = progress_callback,
+                timeout = timeout
+            )
 
 
     def rtt_packet(self, packet):
@@ -265,8 +342,7 @@ class Link:
             if self.owner.callbacks.link_established != None:
                     self.owner.callbacks.link_established(self)
         except Exception as e:
-            RNS.log("Error occurred while processing RTT packet, tearing down link", RNS.LOG_ERROR)
-            traceback.print_exc()
+            RNS.log("Error occurred while processing RTT packet, tearing down link. The contained exception was: "+str(e), RNS.LOG_ERROR)
             self.teardown()
 
     def get_salt(self):
@@ -293,6 +369,12 @@ class Link:
         """
         return min(self.no_inbound_for(), self.no_outbound_for())
 
+    def get_remote_identity(self):
+        """
+        :returns: The identity of the remote peer, if it is known
+        """
+        return self.__remote_identity
+
     def had_outbound(self):
         self.last_outbound = time.time()
 
@@ -354,9 +436,9 @@ class Link:
                 # Link was initiated, but no response
                 # from destination yet
                 if self.status == Link.PENDING:
-                    next_check = self.request_time + self.proof_timeout
+                    next_check = self.request_time + self.establishment_timeout
                     sleep_time = next_check - time.time()
-                    if time.time() >= self.request_time + self.proof_timeout:
+                    if time.time() >= self.request_time + self.establishment_timeout:
                         RNS.log("Link establishment timed out", RNS.LOG_VERBOSE)
                         self.status = Link.CLOSED
                         self.teardown_reason = Link.TIMEOUT
@@ -364,10 +446,14 @@ class Link:
                         sleep_time = 0.001
 
                 elif self.status == Link.HANDSHAKE:
-                    next_check = self.request_time + self.proof_timeout
+                    next_check = self.request_time + self.establishment_timeout
                     sleep_time = next_check - time.time()
-                    if time.time() >= self.request_time + self.proof_timeout:
-                        RNS.log("Timeout waiting for RTT packet from link initiator", RNS.LOG_DEBUG)
+                    if time.time() >= self.request_time + self.establishment_timeout:
+                        if self.initiator:
+                            RNS.log("Timeout waiting link request proof", RNS.LOG_DEBUG)
+                        else:
+                            RNS.log("Timeout waiting for RTT packet from link initiator", RNS.LOG_DEBUG)
+
                         self.status = Link.CLOSED
                         self.teardown_reason = Link.TIMEOUT
                         self.link_closed()
@@ -375,7 +461,7 @@ class Link:
 
                 elif self.status == Link.ACTIVE:
                     if time.time() >= self.last_inbound + self.keepalive:
-                        sleep_time = self.rtt * self.timeout_factor + Link.STALE_GRACE
+                        sleep_time = self.rtt * self.keepalive_timeout_factor + Link.STALE_GRACE
                         self.status = Link.STALE
                         if self.initiator:
                             self.send_keepalive()
@@ -404,6 +490,84 @@ class Link:
         keepalive_packet.send()
         self.had_outbound()
 
+    def handle_request(self, request_id, unpacked_request):
+        if self.status == Link.ACTIVE:
+            requested_at = unpacked_request[0]
+            path_hash    = unpacked_request[1]
+            request_data = unpacked_request[2]
+
+            if path_hash in self.destination.request_handlers:
+                request_handler = self.destination.request_handlers[path_hash]
+                path               = request_handler[0]
+                response_generator = request_handler[1]
+                allow              = request_handler[2]
+                allowed_list       = request_handler[3]
+
+                allowed = False
+                if not allow == RNS.Destination.ALLOW_NONE:
+                    if allow == RNS.Destination.ALLOW_LIST:
+                        if self.__remote_identity.hash in allowed_list:
+                            allowed = True
+                    elif allow == RNS.Destination.ALLOW_ALL:
+                        allowed = True
+
+                if allowed:
+                    RNS.log("Handling request "+RNS.prettyhexrep(request_id)+" for: "+str(path), RNS.LOG_DEBUG)
+                    response = response_generator(path, request_data, request_id, self.__remote_identity, requested_at)
+                    if response != None:
+                        packed_response = umsgpack.packb([request_id, response])
+
+                        if len(packed_response) <= Link.MDU:
+                            RNS.Packet(self, packed_response, RNS.Packet.DATA, context = RNS.Packet.RESPONSE).send()
+                        else:
+                            response_resource = RNS.Resource(packed_response, self, request_id = request_id, is_response = True)
+                else:
+                    identity_string = RNS.prettyhexrep(self.get_remote_identity()) if self.get_remote_identity() != None else "<Unknown>"
+                    RNS.log("Request "+RNS.prettyhexrep(request_id)+" from "+identity_string+" not allowed for: "+str(path), RNS.LOG_DEBUG)
+
+    def handle_response(self, request_id, response_data, response_size, response_transfer_size):
+        if self.status == Link.ACTIVE:
+            remove = None
+            for pending_request in self.pending_requests:
+                if pending_request.request_id == request_id:
+                    remove = pending_request
+                    try:
+                        pending_request.response_size = response_size
+                        pending_request.response_transfer_size = response_transfer_size
+                        pending_request.response_received(response_data)
+                    except Exception as e:
+                        RNS.log("Error occurred while handling response. The contained exception was: "+str(e), RNS.LOG_ERROR)
+
+                    break
+
+            if remove != None:
+                self.pending_requests.remove(remove)
+
+    def request_resource_concluded(self, resource):
+        if resource.status == RNS.Resource.COMPLETE:
+            packed_request    = resource.data.read()
+            unpacked_request  = umsgpack.unpackb(packed_request)
+            request_id        = RNS.Identity.truncated_hash(packed_request)
+            request_data      = unpacked_request
+
+            self.handle_request(request_id, request_data)
+        else:
+            RNS.log("Incoming request resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
+
+    def response_resource_concluded(self, resource):
+        if resource.status == RNS.Resource.COMPLETE:
+            packed_response   = resource.data.read()
+            unpacked_response = umsgpack.unpackb(packed_response)
+            request_id        = unpacked_response[0]
+            response_data     = unpacked_response[1]
+
+            self.handle_response(request_id, response_data, resource.total_size, resource.size)
+        else:
+            RNS.log("Incoming response resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
+            for pending_request in self.pending_requests:
+                if pending_request.request_id == resource.request_id:
+                    pending_request.request_timed_out(None)
+
     def receive(self, packet):
         self.watchdog_lock = True
         if not self.status == Link.CLOSED and not (self.initiator and packet.context == RNS.Packet.KEEPALIVE and packet.data == bytes([0xFF])):
@@ -431,6 +595,41 @@ class Link:
                             if self.destination.callbacks.proof_requested:
                                 self.destination.callbacks.proof_requested(packet)
 
+                    elif packet.context == RNS.Packet.LINKIDENTIFY:
+                        plaintext = self.decrypt(packet.data)
+
+                        if not self.initiator and len(plaintext) == RNS.Identity.KEYSIZE//8 + RNS.Identity.SIGLENGTH//8:
+                            public_key   = plaintext[:RNS.Identity.KEYSIZE//8]
+                            signed_data  = self.link_id+public_key
+                            signature    = plaintext[RNS.Identity.KEYSIZE//8:RNS.Identity.KEYSIZE//8+RNS.Identity.SIGLENGTH//8]
+                            identity     = RNS.Identity(create_keys=False)
+                            identity.load_public_key(public_key)
+
+                            if identity.validate(signature, signed_data):
+                                self.__remote_identity = identity
+                                if self.callbacks.remote_identified != None:
+                                    self.callbacks.remote_identified(self.__remote_identity)
+
+                    elif packet.context == RNS.Packet.REQUEST:
+                        try:
+                            request_id = packet.getTruncatedHash()
+                            packed_request = self.decrypt(packet.data)
+                            unpacked_request = umsgpack.unpackb(packed_request)
+                            self.handle_request(request_id, unpacked_request)
+                        except Exception as e:
+                            RNS.log("Error occurred while handling request. The contained exception was: "+str(e), RNS.LOG_ERROR)
+
+                    elif packet.context == RNS.Packet.RESPONSE:
+                        try:
+                            packed_response = self.decrypt(packet.data)
+                            unpacked_response = umsgpack.unpackb(packed_response)
+                            request_id = unpacked_response[0]
+                            response_data = unpacked_response[1]
+                            transfer_size = len(umsgpack.packb(response_data))-2
+                            self.handle_response(request_id, response_data, transfer_size, transfer_size)
+                        except Exception as e:
+                            RNS.log("Error occurred while handling response. The contained exception was: "+str(e), RNS.LOG_ERROR)
+
                     elif packet.context == RNS.Packet.LRRTT:
                         if not self.initiator:
                             self.rtt_packet(packet)
@@ -440,7 +639,18 @@ class Link:
 
                     elif packet.context == RNS.Packet.RESOURCE_ADV:
                         packet.plaintext = self.decrypt(packet.data)
-                        if self.resource_strategy == Link.ACCEPT_NONE:
+
+                        if RNS.ResourceAdvertisement.is_request(packet):
+                            RNS.Resource.accept(packet, callback=self.request_resource_concluded)
+                        elif RNS.ResourceAdvertisement.is_response(packet):
+                            request_id = RNS.ResourceAdvertisement.get_request_id(packet)
+                            for pending_request in self.pending_requests:
+                                if pending_request.request_id == request_id:
+                                    RNS.Resource.accept(packet, callback=self.response_resource_concluded, progress_callback=pending_request.response_resource_progress, request_id = request_id)
+                                    pending_request.response_size = RNS.ResourceAdvertisement.get_size(packet)
+                                    pending_request.response_transfer_size = RNS.ResourceAdvertisement.get_transfer_size(packet)
+                                    pending_request.started_at = time.time()
+                        elif self.resource_strategy == Link.ACCEPT_NONE:
                             pass
                         elif self.resource_strategy == Link.ACCEPT_APP:
                             if self.callbacks.resource != None:
@@ -457,7 +667,11 @@ class Link:
                             resource_hash = plaintext[1:RNS.Identity.HASHLENGTH//8+1]
                         for resource in self.outgoing_resources:
                             if resource.hash == resource_hash:
-                                resource.request(plaintext)
+                                # We need to check that this request has not been
+                                # received before in order to avoid sequencing errors.
+                                if not packet.packet_hash in resource.req_hashlist:
+                                    resource.req_hashlist.append(packet.packet_hash)
+                                    resource.request(plaintext)
 
                     elif packet.context == RNS.Packet.RESOURCE_HMU:
                         plaintext = self.decrypt(packet.data)
@@ -499,32 +713,42 @@ class Link:
 
 
     def encrypt(self, plaintext):
-        if self.__encryption_disabled:
-            return plaintext
         try:
             if not self.fernet:
-                self.fernet = Fernet(base64.urlsafe_b64encode(self.derived_key))
+                try:
+                    self.fernet = Fernet(base64.urlsafe_b64encode(self.derived_key))
+                except Exception as e:
+                    RNS.log("Could not "+str(self)+" instantiate Fernet while performin encryption on link. The contained exception was: "+str(e), RNS.LOG_ERROR)
+                    raise e
 
-            ciphertext = base64.urlsafe_b64decode(self.fernet.encrypt(plaintext))
+            # The fernet token VERSION field is stripped here and
+            # reinserted on the receiving end, since it is always
+            # set to 0x80.
+            #
+            # Since we're also quite content with supporting time-
+            # stamps until the year 8921556 AD, we'll also strip 2
+            # bytes from the timestamp field and reinsert those as
+            # 0x00 when received.
+            ciphertext = base64.urlsafe_b64decode(self.fernet.encrypt(plaintext))[3:]
             return ciphertext
+
         except Exception as e:
             RNS.log("Encryption on link "+str(self)+" failed. The contained exception was: "+str(e), RNS.LOG_ERROR)
+            raise e
 
 
     def decrypt(self, ciphertext):
-        if self.__encryption_disabled:
-            return ciphertext
         try:
             if not self.fernet:
                 self.fernet = Fernet(base64.urlsafe_b64encode(self.derived_key))
                 
-            plaintext = self.fernet.decrypt(base64.urlsafe_b64encode(ciphertext))
+            plaintext = self.fernet.decrypt(base64.urlsafe_b64encode(bytes([RNS.Identity.FERNET_VERSION, 0x00, 0x00])+ciphertext))
             return plaintext
         except Exception as e:
             RNS.log("Decryption failed on link "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
             RNS.log(traceback.format_exc(), RNS.LOG_ERROR)
-            # TODO: Do we really need to do this? Or can we recover somehow?
-            self.teardown()
+            # TODO: Think long about implications here
+            # self.teardown()
 
 
     def sign(self, message):
@@ -537,13 +761,13 @@ class Link:
         except Exception as e:
             return False
 
-    def link_established_callback(self, callback):
+    def set_link_established_callback(self, callback):
         self.callbacks.link_established = callback
 
-    def link_closed_callback(self, callback):
+    def set_link_closed_callback(self, callback):
         self.callbacks.link_closed = callback
 
-    def packet_callback(self, callback):
+    def set_packet_callback(self, callback):
         """
         Registers a function to be called when a packet has been
         received over this link.
@@ -552,7 +776,7 @@ class Link:
         """
         self.callbacks.packet = callback
 
-    def resource_callback(self, callback):
+    def set_resource_callback(self, callback):
         """
         Registers a function to be called when a resource has been
         advertised over this link. If the function returns *True*
@@ -563,7 +787,7 @@ class Link:
         """
         self.callbacks.resource = callback
 
-    def resource_started_callback(self, callback):
+    def set_resource_started_callback(self, callback):
         """
         Registers a function to be called when a resource has begun
         transferring over this link.
@@ -572,7 +796,7 @@ class Link:
         """
         self.callbacks.resource_started = callback
 
-    def resource_concluded_callback(self, callback):
+    def set_resource_concluded_callback(self, callback):
         """
         Registers a function to be called when a resource has concluded
         transferring over this link.
@@ -581,6 +805,15 @@ class Link:
         """
         self.callbacks.resource_concluded = callback
 
+    def set_remote_identified_callback(self, callback):
+        """
+        Registers a function to be called when an initiating peer has
+        identified over this link.
+
+        :param callback: A function or method with the signature *callback(identity)* to be called.
+        """
+        self.callbacks.remote_identified = callback
+
     def resource_concluded(self, resource):
         if resource in self.incoming_resources:
             self.incoming_resources.remove(resource)
@@ -623,27 +856,177 @@ class Link:
         else:
             return True
 
-    def disable_encryption(self):
-        """
-        HAZARDOUS. This will downgrade the link to encryptionless. All
-        information over the link will be sent in plaintext. Never use
-        this in production applications. Should only be used for debugging
-        purposes, and will disappear in a future version.
-
-        If encryptionless links are not explicitly allowed in the users
-        configuration file, Reticulum will terminate itself along with the
-        client application and throw an error message to the user.
-        """
-        if (RNS.Reticulum.should_allow_unencrypted()):
-            RNS.log("The link "+str(self)+" was downgraded to an encryptionless link", RNS.LOG_NOTICE)
-            self.__encryption_disabled = True
-        else:
-            RNS.log("Attempt to disable encryption on link, but encryptionless links are not allowed by config.", RNS.LOG_CRITICAL)
-            RNS.log("Shutting down Reticulum now!", RNS.LOG_CRITICAL)
-            RNS.panic()
-
-    def encryption_disabled(self):
-        return self.__encryption_disabled
-
     def __str__(self):
-        return RNS.prettyhexrep(self.link_id)
+        return RNS.prettyhexrep(self.link_id)
+
+
+class RequestReceipt():
+    """
+    An instance of this class is returned by the ``request`` method of ``RNS.Link``
+    instances. It should never be instantiated manually. It provides methods to
+    check status, response time and response data when the request concludes.
+    """
+
+    FAILED    = 0x00
+    SENT      = 0x01
+    DELIVERED = 0x02
+    RECEIVING = 0x03
+    READY     = 0x04
+
+    def __init__(self, link, packet_receipt = None, resource = None, response_callback = None, failed_callback = None, progress_callback = None, timeout = None):
+        self.packet_receipt = packet_receipt
+        self.resource = resource
+        self.started_at = None
+
+        if self.packet_receipt != None:
+            self.hash = packet_receipt.truncated_hash
+            self.packet_receipt.set_timeout_callback(self.request_timed_out)
+            self.started_at = time.time()
+
+        elif self.resource != None:
+            self.hash = resource.request_id
+            resource.set_callback(self.request_resource_concluded)
+        
+        self.link                   = link
+        self.request_id             = self.hash
+
+        self.response               = None
+        self.response_transfer_size = None
+        self.response_size          = None
+        self.status                 = RequestReceipt.SENT
+        self.sent_at                = time.time()
+        self.progress               = 0
+        self.concluded_at           = None
+        self.response_concluded_at  = None
+
+        if timeout != None:
+            self.timeout        = timeout
+        else:
+            raise ValueError("No timeout specified for request receipt")
+
+        self.callbacks          = RequestReceiptCallbacks()
+        self.callbacks.response = response_callback
+        self.callbacks.failed   = failed_callback
+        self.callbacks.progress = progress_callback
+
+        self.link.pending_requests.append(self)
+
+
+    def request_resource_concluded(self, resource):
+        if resource.status == RNS.Resource.COMPLETE:
+            RNS.log("Request "+RNS.prettyhexrep(self.request_id)+" successfully sent as resource.", RNS.LOG_DEBUG)
+            self.started_at = time.time()
+            self.status = RequestReceipt.DELIVERED
+            self.__resource_response_timeout = time.time()+self.timeout
+            response_timeout_thread = threading.Thread(target=self.__response_timeout_job)
+            response_timeout_thread.setDaemon(True)
+            response_timeout_thread.start()
+        else:
+            RNS.log("Sending request "+RNS.prettyhexrep(self.request_id)+" as resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
+            self.status = RequestReceipt.FAILED
+            self.concluded_at = time.time()
+            self.link.pending_requests.remove(self)
+
+            if self.callbacks.failed != None:
+                self.callbacks.failed(self)
+
+
+    def __response_timeout_job(self):
+        while self.status == RequestReceipt.DELIVERED:
+            now = time.time()
+            if now > self.__resource_response_timeout:
+                self.request_timed_out(None)
+
+            time.sleep(0.1)
+
+
+    def request_timed_out(self, packet_receipt):
+        self.status = RequestReceipt.FAILED
+        self.concluded_at = time.time()
+        self.link.pending_requests.remove(self)
+
+        if self.callbacks.failed != None:
+            self.callbacks.failed(self)
+
+
+    def response_resource_progress(self, resource):
+        if not self.status == RequestReceipt.FAILED:
+            self.status = RequestReceipt.RECEIVING
+            if self.packet_receipt != None:
+                self.packet_receipt.status = RNS.PacketReceipt.DELIVERED
+                self.packet_receipt.proved = True
+                self.packet_receipt.concluded_at = time.time()
+                if self.packet_receipt.callbacks.delivery != None:
+                    self.packet_receipt.callbacks.delivery(self.packet_receipt)
+
+            self.progress = resource.get_progress()
+            
+            if self.callbacks.progress != None:
+                self.callbacks.progress(self)
+        else:
+            resource.cancel()
+
+    
+    def response_received(self, response):
+        if not self.status == RequestReceipt.FAILED:
+            self.progress = 1.0
+            self.response = response
+            self.status = RequestReceipt.READY
+            self.response_concluded_at = time.time()
+
+            if self.packet_receipt != None:
+                self.packet_receipt.status = RNS.PacketReceipt.DELIVERED
+                self.packet_receipt.proved = True
+                self.packet_receipt.concluded_at = time.time()
+                if self.packet_receipt.callbacks.delivery != None:
+                    self.packet_receipt.callbacks.delivery(self.packet_receipt)
+
+            if self.callbacks.progress != None:
+                self.callbacks.progress(self)
+
+            if self.callbacks.response != None:
+                self.callbacks.response(self)
+
+    def get_request_id(self):
+        """
+        :returns: The request ID as *bytes*.
+        """
+        return self.request_id
+
+    def get_status(self):
+        """
+        :returns: The current status of the request, one of ``RNS.RequestReceipt.FAILED``, ``RNS.RequestReceipt.SENT``, ``RNS.RequestReceipt.DELIVERED``, ``RNS.RequestReceipt.READY``.
+        """
+        return self.status
+
+    def get_progress(self):
+        """
+        :returns: The progress of a response being received as a *float* between 0.0 and 1.0.
+        """
+        return self.progress
+
+    def get_response(self):
+        """
+        :returns: The response as *bytes* if it is ready, otherwise *None*.
+        """
+        if self.status == RequestReceipt.READY:
+            return self.response
+        else:
+            return None
+
+    def get_response_time(self):
+        """
+        :returns: The response time of the request in seconds.
+        """
+        if self.status == RequestReceipt.READY:
+            return self.response_concluded_at - self.started_at
+        else:
+            return None
+
+
+
+class RequestReceiptCallbacks:
+    def __init__(self):
+        self.response = None
+        self.failed   = None
+        self.progress = None

RNS/Packet.py

@@ -6,17 +6,20 @@ import RNS
 
 class Packet:
     """
-    The Packet class is used to create packet instances that can be
-    sent over a Reticulum network.
+    The Packet class is used to create packet instances that can be sent
+    over a Reticulum network. Packets to will automatically be encrypted if
+    they are adressed to a ``RNS.Destination.SINGLE`` destination,
+    ``RNS.Destination.GROUP`` destination or a :ref:`RNS.Link<api-link>`.
+
+    For ``RNS.Destination.GROUP`` destinations, Reticulum will use the
+    pre-shared key configured for the destination.
+
+    For ``RNS.Destination.SINGLE`` destinations and :ref:`RNS.Link<api-link>`
+    destinations, reticulum will use ephemeral keys, and offers **Forward Secrecy**.
 
     :param destination: A :ref:`RNS.Destination<api-destination>` instance to which the packet will be sent.
     :param data: The data payload to be included in the packet as *bytes*.
     :param create_receipt: Specifies whether a :ref:`RNS.PacketReceipt<api-packetreceipt>` should be created when instantiating the packet.
-    :param type: Internal use by :ref:`RNS.Transport<api-transport>`. Defaults to ``RNS.Packet.DATA``, and should not be specified.
-    :param context: Internal use by :ref:`RNS.Transport<api-transport>`. Ignore.
-    :param transport_type: Internal use by :ref:`RNS.Transport<api-transport>`. Ignore.
-    :param transport_id: Internal use by :ref:`RNS.Transport<api-transport>`. Ignore.
-    :param attached_interface: Internal use by :ref:`RNS.Transport<api-transport>`. Ignore.
     """
 
     # Packet types
@@ -33,7 +36,7 @@ class Packet:
     HEADER_4     = 0x03     # Reserved
     header_types = [HEADER_1, HEADER_2, HEADER_3, HEADER_4]
 
-    # Data packet context types
+    # Packet context types
     NONE           = 0x00   # Generic data packet
     RESOURCE       = 0x01   # Packet is part of a resource
     RESOURCE_ADV   = 0x02   # Packet is a resource advertisement
@@ -48,7 +51,8 @@ class Packet:
     PATH_RESPONSE  = 0x0B   # Packet is a response to a path request
     COMMAND        = 0x0C   # Packet is a command
     COMMAND_STATUS = 0x0D   # Packet is a status of an executed command
-    KEEPALIVE      = 0xFB   # Packet is a keepalive packet
+    KEEPALIVE      = 0xFA   # Packet is a keepalive packet
+    LINKIDENTIFY   = 0xFB   # Packet is a link peer identification proof
     LINKCLOSE      = 0xFC   # Packet is a link close message
     LINKPROOF      = 0xFD   # Packet is a link packet proof
     LRRTT          = 0xFE   # Packet is a link request round-trip time measurement
@@ -56,19 +60,24 @@ class Packet:
 
     # This is used to calculate allowable
     # payload sizes
-    HEADER_MAXSIZE = 23
+    HEADER_MAXSIZE = RNS.Reticulum.HEADER_MAXSIZE
     MDU            = RNS.Reticulum.MDU
 
-    # With an MTU of 500, the maximum RSA-encrypted
-    # amount of data we can send in a single packet
-    # is given by the below calculation; 258 bytes.
-    RSA_MDU   = math.floor(MDU/RNS.Identity.DECRYPT_CHUNKSIZE)*RNS.Identity.ENCRYPT_CHUNKSIZE
-    PLAIN_MDU = MDU
+    # With an MTU of 500, the maximum of data we can
+    # send in a single encrypted packet is given by
+    # the below calculation; 383 bytes.
+    ENCRYPTED_MDU  = math.floor((RNS.Reticulum.MDU-RNS.Identity.FERNET_OVERHEAD-RNS.Identity.KEYSIZE//16)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
+    """
+    The maximum size of the payload data in a single encrypted packet 
+    """
+    PLAIN_MDU      = MDU
+    """
+    The maximum size of the payload data in a single unencrypted packet 
+    """
 
-    # TODO: This should be calculated
-    # more intelligently
-    # Default packet timeout
-    TIMEOUT      = 60
+    # This value is set at a reasonable
+    # level for a 1 Kb/s channel.
+    TIMEOUT_PER_HOP = 5
 
     def __init__(self, destination, data, packet_type = DATA, context = NONE, transport_type = RNS.Transport.BROADCAST, header_type = HEADER_1, transport_id = None, attached_interface = None, create_receipt = True):
         if destination != None:
@@ -128,6 +137,9 @@ class Packet:
                 if self.packet_type == Packet.ANNOUNCE:
                     # Announce packets are not encrypted
                     self.ciphertext = self.data
+                elif self.packet_type == Packet.LINKREQUEST:
+                    # Link request packets are not encrypted
+                    self.ciphertext = self.data
                 elif self.packet_type == Packet.PROOF and self.context == Packet.RESOURCE_PRF:
                     # Resource proofs are not encrypted
                     self.ciphertext = self.data
@@ -171,6 +183,7 @@ class Packet:
         self.packed = True
         self.update_hash()
 
+
     def unpack(self):
         self.flags = self.raw[0]
         self.hops  = self.raw[1]
@@ -291,8 +304,8 @@ class PacketReceipt:
     """
     The PacketReceipt class is used to receive notifications about
     :ref:`RNS.Packet<api-packet>` instances sent over the network. Instances
-    of this class should never be created manually, but always returned
-    from a the *send()* method of a :ref:`RNS.Packet<api-packet>` instance.
+    of this class are never created manually, but always returned from
+    the *send()* method of a :ref:`RNS.Packet<api-packet>` instance.
     """
     # Receipt status constants
     FAILED    = 0x00
@@ -306,15 +319,21 @@ class PacketReceipt:
 
     # Creates a new packet receipt from a sent packet
     def __init__(self, packet):
-        self.hash    = packet.get_hash()
-        self.sent    = True
-        self.sent_at = time.time()
-        self.timeout = Packet.TIMEOUT
-        self.proved  = False
-        self.status  = PacketReceipt.SENT
-        self.destination = packet.destination
-        self.callbacks   = PacketReceiptCallbacks()
-        self.concluded_at = None
+        self.hash           = packet.get_hash()
+        self.truncated_hash = packet.getTruncatedHash()
+        self.sent           = True
+        self.sent_at        = time.time()
+        self.proved         = False
+        self.status         = PacketReceipt.SENT
+        self.destination    = packet.destination
+        self.callbacks      = PacketReceiptCallbacks()
+        self.concluded_at   = None
+
+        if packet.destination.type == RNS.Destination.LINK:
+            self.timeout    = packet.destination.rtt * packet.destination.traffic_timeout_factor
+        else:
+            self.timeout    = Packet.TIMEOUT_PER_HOP * RNS.Transport.hops_to(self.destination.hash)
+
 
     def get_status(self):
         """
@@ -406,7 +425,7 @@ class PacketReceipt:
         else:
             return False
 
-    def rtt(self):
+    def get_rtt(self):
         """
         :returns: The round-trip-time in seconds
         """
@@ -416,7 +435,7 @@ class PacketReceipt:
         return (self.sent_at+self.timeout < time.time())
 
     def check_timeout(self):
-        if self.is_timed_out():
+        if self.status == PacketReceipt.SENT and self.is_timed_out():
             if self.timeout == -1:
                 self.status = PacketReceipt.CULLED
             else:
@@ -428,7 +447,6 @@ class PacketReceipt:
                 thread = threading.Thread(target=self.callbacks.timeout, args=(self,))
                 thread.setDaemon(True)
                 thread.start()
-                #self.callbacks.timeout(self)
 
 
     def set_timeout(self, timeout):
@@ -439,7 +457,7 @@ class PacketReceipt:
         """
         self.timeout = float(timeout)
 
-    def delivery_callback(self, callback):
+    def set_delivery_callback(self, callback):
         """
         Sets a function that gets called if a successfull delivery has been proven.
 
@@ -449,7 +467,7 @@ class PacketReceipt:
 
     # Set a function that gets called if the
     # delivery times out
-    def timeout_callback(self, callback):
+    def set_timeout_callback(self, callback):
         """
         Sets a function that gets called if the delivery times out.
 

RNS/Resource.py

@@ -15,13 +15,10 @@ class Resource:
 
     :param data: The data to be transferred. Can be *bytes* or an open *file handle*. See the :ref:`Filetransfer Example<example-filetransfer>` for details.
     :param link: The :ref:`RNS.Link<api-link>` instance on which to transfer the data.
-    :param advertise: Whether to automatically advertise the resource. Can be *True* or *False*.
-    :param auto_compress: Whether to auto-compress the resource. Can be *True* or *False*.
-    :param auto_compress: Whether the resource must be compressed. Can be *True* or *False*. Used for debugging, will disappear in the future.
-    :param callback: A *callable* with the signature *callback(resource)*. Will be called when the resource transfer concludes.
-    :param progress_callback: A *callable* with the signature *callback(resource)*. Will be called whenever the resource transfer progress is updated.
-    :param segment_index: Internal use, ignore.
-    :param original_hash: Internal use, ignore.
+    :param advertise: Optional. Whether to automatically advertise the resource. Can be *True* or *False*.
+    :param auto_compress: Optional. Whether to auto-compress the resource. Can be *True* or *False*.
+    :param callback: An optional *callable* with the signature *callback(resource)*. Will be called when the resource transfer concludes.
+    :param progress_callback: An optional *callable* with the signature *callback(resource)*. Will be called whenever the resource transfer progress is updated.
     """
     WINDOW_FLEXIBILITY   = 4
     WINDOW_MIN           = 1
@@ -35,26 +32,31 @@ class Resource:
     # maximum size a resource should be, if
     # it is to be handled within reasonable
     # time constraint, even on small systems.
-    
+    #
     # A small system in this regard is
     # defined as a Raspberry Pi, which should
     # be able to compress, encrypt and hash-map
     # the resource in about 10 seconds.
-
+    #
     # This constant will be used when determining
     # how to sequence the sending of large resources.
-    MAX_EFFICIENT_SIZE   = 16 * 1024 * 1024
+    #
+    # Capped at 16777215 (0xFFFFFF) per segment to
+    # fit in 3 bytes in resource advertisements.
+    MAX_EFFICIENT_SIZE      = 16 * 1024 * 1024 - 1
+    RESPONSE_MAX_GRACE_TIME = 10
     
     # The maximum size to auto-compress with
     # bz2 before sending.
     AUTO_COMPRESS_MAX_SIZE = MAX_EFFICIENT_SIZE
 
-    # TODO: Should be allocated more
-    # intelligently
-    # TODO: Set higher
-    MAX_RETRIES       = 5
-    SENDER_GRACE_TIME = 10
-    RETRY_GRACE_TIME  = 0.25
+    PART_TIMEOUT_FACTOR           = 4
+    PART_TIMEOUT_FACTOR_AFTER_RTT = 2
+    MAX_RETRIES                   = 5
+    SENDER_GRACE_TIME             = 10
+    RETRY_GRACE_TIME              = 0.25
+
+    WATCHDOG_MAX_SLEEP            = 1
 
     HASHMAP_IS_NOT_EXHAUSTED = 0x00
     HASHMAP_IS_EXHAUSTED = 0xFF
@@ -71,11 +73,11 @@ class Resource:
     CORRUPT         = 0x08
 
     @staticmethod
-    def accept(advertisement_packet, callback=None, progress_callback = None):
+    def accept(advertisement_packet, callback=None, progress_callback = None, request_id = None):
         try:
             adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
 
-            resource = Resource(None, advertisement_packet.link)
+            resource = Resource(None, advertisement_packet.link, request_id = request_id)
             resource.status = Resource.TRANSFERRING
 
             resource.flags               = adv.f
@@ -120,7 +122,8 @@ class Resource:
             resource.link.register_incoming_resource(resource)
 
             RNS.log("Accepting resource advertisement for "+RNS.prettyhexrep(resource.hash), RNS.LOG_DEBUG)
-            resource.link.callbacks.resource_started(resource)
+            if resource.link.callbacks.resource_started != None:
+                resource.link.callbacks.resource_started(resource)
 
             resource.hashmap_update(0, resource.hashmap_raw)
 
@@ -134,7 +137,7 @@ class Resource:
     # Create a resource for transmission to a remote destination
     # The data passed can be either a bytes-array or a file opened
     # in binary read mode.
-    def __init__(self, data, link, advertise=True, auto_compress=True, must_compress=False, callback=None, progress_callback=None, segment_index = 1, original_hash = None):
+    def __init__(self, data, link, advertise=True, auto_compress=True, callback=None, progress_callback=None, timeout = None, segment_index = 1, original_hash = None, request_id = None, is_response = False):
         data_size = None
         resource_data = None
         if hasattr(data, "read"):
@@ -181,24 +184,32 @@ class Resource:
         self.link = link
         self.max_retries = Resource.MAX_RETRIES
         self.retries_left = self.max_retries
-        self.default_timeout = self.link.default_timeout
-        self.timeout_factor = self.link.timeout_factor
+        self.timeout_factor = self.link.traffic_timeout_factor
+        self.part_timeout_factor = Resource.PART_TIMEOUT_FACTOR
         self.sender_grace_time = Resource.SENDER_GRACE_TIME
         self.hmu_retry_ok = False
         self.watchdog_lock = False
         self.__watchdog_job_id = 0
         self.__progress_callback = progress_callback
         self.rtt = None
+        self.request_id = request_id
+        self.is_response = is_response
 
+        self.req_hashlist = []
         self.receiver_min_consecutive_height = 0
 
+        if timeout != None:
+            self.timeout = timeout
+        else:
+            self.timeout = self.link.rtt * self.link.traffic_timeout_factor
+
         if data != None:
             self.initiator         = True
             self.callback          = callback
             self.uncompressed_data = data
 
             compression_began = time.time()
-            if must_compress or (auto_compress and len(self.uncompressed_data) < Resource.AUTO_COMPRESS_MAX_SIZE):
+            if (auto_compress and len(self.uncompressed_data) < Resource.AUTO_COMPRESS_MAX_SIZE):
                 RNS.log("Compressing resource data...", RNS.LOG_DEBUG)
                 self.compressed_data   = bz2.compress(self.uncompressed_data)
                 RNS.log("Compression completed in "+str(round(time.time()-compression_began, 3))+" seconds", RNS.LOG_DEBUG)
@@ -234,11 +245,8 @@ class Resource:
             # make optimal use of packet MTU on an entire
             # encrypted stream. The Resource instance will
             # use it's underlying link directly to encrypt.
-            if not self.link.encryption_disabled():
-                self.data = self.link.encrypt(self.data)
-                self.encrypted = True
-            else:
-                self.encrypted = False
+            self.data = self.link.encrypt(self.data)
+            self.encrypted = True
 
             self.size = len(self.data)
             self.sent_parts = 0
@@ -251,6 +259,7 @@ class Resource:
 
                 self.random_hash       = RNS.Identity.get_random_hash()[:Resource.RANDOM_HASH_SIZE]
                 self.hash = RNS.Identity.full_hash(data+self.random_hash)
+                self.truncated_hash = RNS.Identity.truncated_hash(data+self.random_hash)
                 self.expected_proof = RNS.Identity.full_hash(data+self.hash)
 
                 if original_hash == None:
@@ -365,7 +374,7 @@ class Resource:
             sleep_time = None
 
             if self.status == Resource.ADVERTISED:
-                sleep_time = (self.adv_sent+self.default_timeout)-time.time()
+                sleep_time = (self.adv_sent+self.timeout)-time.time()
                 if sleep_time < 0:
                     if self.retries_left <= 0:
                         RNS.log("Resource transfer timeout after sending advertisement", RNS.LOG_DEBUG)
@@ -386,8 +395,24 @@ class Resource:
 
             elif self.status == Resource.TRANSFERRING:
                 if not self.initiator:
-                    rtt = self.link.rtt if self.rtt == None else self.rtt
-                    sleep_time = self.last_activity + (rtt*self.timeout_factor) + Resource.RETRY_GRACE_TIME - time.time()
+
+                    if self.rtt == None:
+                        rtt = self.link.rtt
+                    else:
+                        rtt = self.rtt
+
+                    window_remaining = self.outstanding_parts
+
+                    sleep_time = self.last_activity + (rtt*(self.part_timeout_factor+window_remaining)) + Resource.RETRY_GRACE_TIME - time.time()
+                    
+                    # TODO: Remove debug info
+                    # RNS.log("rtt   "+str(rtt))
+                    # RNS.log("ptof  "+str(self.part_timeout_factor))
+                    # RNS.log("wait  "+str((rtt*self.part_timeout_factor) + Resource.RETRY_GRACE_TIME))
+                    # RNS.log("sleep "+str(sleep_time))
+                    # RNS.log("wndw  "+str(self.window))
+                    # RNS.log("wndwr "+str(window_remaining))
+                    # RNS.log("")
 
                     if sleep_time < 0:
                         if self.retries_left > 0:
@@ -438,7 +463,7 @@ class Resource:
                 self.cancel()
             
             if sleep_time != None:
-                sleep(sleep_time)
+                sleep(min(sleep_time, Resource.WATCHDOG_MAX_SLEEP))
 
     def assemble(self):
         if not self.status == Resource.FAILED:
@@ -537,11 +562,15 @@ class Resource:
         if self.req_resp == None:
             self.req_resp = self.last_activity
             rtt = self.req_resp-self.req_sent
+
+            self.part_timeout_factor = Resource.PART_TIMEOUT_FACTOR_AFTER_RTT
             if self.rtt == None:
-                self.rtt = rtt
+                self.rtt = self.link.rtt
                 self.watchdog_job()
-            elif self.rtt < rtt:
-                self.rtt = rtt
+            elif rtt < self.rtt:
+                self.rtt = max(self.rtt - self.rtt*0.05, rtt)
+            elif rtt > self.rtt:
+                self.rtt = min(self.rtt + self.rtt*0.05, rtt)
 
         if not self.status == Resource.FAILED:
             self.status = Resource.TRANSFERRING
@@ -566,14 +595,21 @@ class Resource:
                             self.consecutive_completed_height = cp
                             cp += 1
 
+                        if self.__progress_callback != None:
+                            self.__progress_callback(self)
+
+                        # TODO: Remove debug info
+                        # RNS.log("outstanding_parts "+str(self.outstanding_parts))
+                        # RNS.log("total_parts "+str(self.total_parts))
+                        # RNS.log("received_count "+str(self.received_count))
+
                 i += 1
 
             self.receiving_part = False
 
-            if self.__progress_callback != None:
-                self.__progress_callback(self)
-
-            if self.outstanding_parts == 0 and self.received_count == self.total_parts:
+            # TODO: Remove
+            #if self.outstanding_parts == 0 and self.received_count == self.total_parts:
+            if self.received_count == self.total_parts:
                 self.assemble()
             elif self.outstanding_parts == 0:
                 # TODO: Figure out if there is a mathematically
@@ -691,6 +727,7 @@ class Resource:
                 if part_index % ResourceAdvertisement.HASHMAP_MAX_LEN != 0:
                     RNS.log("Resource sequencing error, cancelling transfer!", RNS.LOG_ERROR)
                     self.cancel()
+                    return
                 else:
                     segment = part_index // ResourceAdvertisement.HASHMAP_MAX_LEN
 
@@ -740,16 +777,17 @@ class Resource:
                 self.link.resource_concluded(self)
                 self.callback(self)
 
+    def set_callback(self, callback):
+        self.callback = callback
+
     def progress_callback(self, callback):
         self.__progress_callback = callback
 
-    def progress(self):
+    def get_progress(self):
         """
         :returns: The current progress of the resource transfer as a *float* between 0.0 and 1.0.
         """
         if self.initiator:
-            # TODO: Remove
-            # progress = self.sent_parts / len(self.parts)
             self.processed_parts  = (self.segment_index-1)*math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)
             self.processed_parts += self.sent_parts
             self.progress_total_parts = float(self.grand_total_parts)
@@ -770,24 +808,78 @@ class Resource:
 
 
 class ResourceAdvertisement:
-    HASHMAP_MAX_LEN      = 73
+    OVERHEAD             = 128
+    HASHMAP_MAX_LEN      = math.floor((RNS.Link.MDU-OVERHEAD)/Resource.MAPHASH_LEN)
     COLLISION_GUARD_SIZE = 2*Resource.WINDOW_MAX+HASHMAP_MAX_LEN
 
-    def __init__(self, resource=None):
+    assert HASHMAP_MAX_LEN > 0, "The configured MTU is too small to include any map hashes in resource advertisments"
+
+    @staticmethod
+    def is_request(advertisement_packet):
+        adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
+        if adv.q != None and adv.u:
+            return True
+        else:
+            return False
+
+
+    @staticmethod
+    def is_response(advertisement_packet):
+        adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
+
+        if adv.q != None and adv.p:
+            return True
+        else:
+            return False
+
+
+    @staticmethod
+    def get_request_id(advertisement_packet):
+        adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
+        return adv.q
+
+
+    @staticmethod
+    def get_transfer_size(advertisement_packet):
+        adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
+        return adv.t
+
+
+    @staticmethod
+    def get_size(advertisement_packet):
+        adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
+        return adv.d
+
+
+    def __init__(self, resource=None, request_id=None, is_response=False):
         if resource != None:
-            self.t = resource.size                             # Transfer size
-            self.d = resource.total_size                       # Total uncompressed data size
-            self.n = len(resource.parts)                       # Number of parts
-            self.h = resource.hash                             # Resource hash
-            self.r = resource.random_hash                      # Resource random hash
-            self.o = resource.original_hash                    # First-segment hash
-            self.m = resource.hashmap                          # Resource hashmap
-            self.c = resource.compressed                       # Compression flag
-            self.e = resource.encrypted                        # Encryption flag
-            self.s = resource.split                            # Split flag
-            self.i = resource.segment_index                    # Segment index
-            self.l = resource.total_segments                   # Total segments
-            self.f = 0x00 | self.s << 2 | self.c << 1 | self.e # Flags
+            self.t = resource.size              # Transfer size
+            self.d = resource.total_size        # Total uncompressed data size
+            self.n = len(resource.parts)        # Number of parts
+            self.h = resource.hash              # Resource hash
+            self.r = resource.random_hash       # Resource random hash
+            self.o = resource.original_hash     # First-segment hash
+            self.m = resource.hashmap           # Resource hashmap
+            self.c = resource.compressed        # Compression flag
+            self.e = resource.encrypted         # Encryption flag
+            self.s = resource.split             # Split flag
+            self.i = resource.segment_index     # Segment index
+            self.l = resource.total_segments    # Total segments
+            self.q = resource.request_id        # ID of associated request
+            self.u = False                      # Is request flag
+            self.p = False                      # Is response flag
+
+            if self.q != None:
+                if not resource.is_response:
+                    self.u = True
+                    self.p = False
+                else:
+                    self.u = False
+                    self.p = True
+
+            # Flags
+            self.f = 0x00 | self.p << 4 | self.u << 3 | self.s << 2 | self.c << 1 | self.e
+
 
     def pack(self, segment=0):
         hashmap_start = segment*ResourceAdvertisement.HASHMAP_MAX_LEN
@@ -806,12 +898,14 @@ class ResourceAdvertisement:
             "o": self.o,    # Original hash
             "i": self.i,    # Segment index
             "l": self.l,    # Total segments
+            "q": self.q,    # Request ID
             "f": self.f,    # Resource flags
             "m": hashmap
         }
 
         return umsgpack.packb(dictionary)
 
+
     @staticmethod
     def unpack(data):
         dictionary = umsgpack.unpackb(data)
@@ -827,8 +921,11 @@ class ResourceAdvertisement:
         adv.f = dictionary["f"]
         adv.i = dictionary["i"]
         adv.l = dictionary["l"]
+        adv.q = dictionary["q"]
         adv.e = True if (adv.f & 0x01) == 0x01 else False
         adv.c = True if ((adv.f >> 1) & 0x01) == 0x01 else False
         adv.s = True if ((adv.f >> 2) & 0x01) == 0x01 else False
+        adv.u = True if ((adv.f >> 3) & 0x01) == 0x01 else False
+        adv.p = True if ((adv.f >> 4) & 0x01) == 0x01 else False
 
         return adv

RNS/Reticulum.py

@@ -36,15 +36,26 @@ class Reticulum:
     other programs to use on demand.
     """
 
-    # The default RNS MTU is 500 bytes. This number has been chosen as
-    # a balance between compatibility with existing hardware devices
-    # on one hand, and the ability to use sufficiently high cryptographic
-    # key sizes on the other. In custom RNS network implementations, it
-    # is possible to raise this value, but doing so will completely break
-    # compatibility with all other RNS networks. An identical MTU is a
-    # prerequisite for peers to communicate in the same network.
+    # Future minimum will probably be locked in at 244 bytes to support
+    # networks with segments of different MTUs. Absolute minimum is 211.
     MTU            = 500
-    HEADER_MAXSIZE = 23
+    """
+    The MTU that Reticulum adheres to, and will expect other peers to
+    adhere to. By default, the MTU is 500 bytes. In custom RNS network
+    implementations, it is possible to change this value, but doing so will
+    completely break compatibility with all other RNS networks. An identical
+    MTU is a prerequisite for peers to communicate in the same network.
+
+    Unless you really know what you are doing, the MTU should be left at
+    the default value.
+    """
+
+    # Length of truncated hashes in bits.
+    TRUNCATED_HASHLENGTH = 80
+
+    HEADER_MINSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*1
+    HEADER_MAXSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*2
+    
     MDU            = MTU - HEADER_MAXSIZE
 
     router         = None
@@ -84,7 +95,6 @@ class Reticulum:
         Reticulum.cachepath     = Reticulum.configdir+"/storage/cache"
         Reticulum.resourcepath  = Reticulum.configdir+"/storage/resources"
 
-        Reticulum.__allow_unencrypted = False
         Reticulum.__transport_enabled = False
         Reticulum.__use_implicit_proof = True
 
@@ -191,20 +201,6 @@ class Reticulum:
                         Reticulum.__use_implicit_proof = True
                     if v == False:
                         Reticulum.__use_implicit_proof = False
-                if option == "allow_unencrypted":
-                    v = self.config["reticulum"].as_bool(option)
-                    if v == True:
-                        RNS.log("", RNS.LOG_CRITICAL)
-                        RNS.log("! ! !     ! ! !     ! ! !", RNS.LOG_CRITICAL)
-                        RNS.log("", RNS.LOG_CRITICAL)
-                        RNS.log("Danger! Encryptionless links have been allowed in the config file!", RNS.LOG_CRITICAL)
-                        RNS.log("Beware of the consequences! Any data sent over a link can potentially be intercepted,", RNS.LOG_CRITICAL)
-                        RNS.log("read and modified! If you are not absolutely sure that you want this,", RNS.LOG_CRITICAL)
-                        RNS.log("you should exit Reticulum NOW and change your config file!", RNS.LOG_CRITICAL)
-                        RNS.log("", RNS.LOG_CRITICAL)
-                        RNS.log("! ! !     ! ! !     ! ! !", RNS.LOG_CRITICAL)
-                        RNS.log("", RNS.LOG_CRITICAL)
-                        Reticulum.__allow_unencrypted = True
 
         self.__start_local_interface()
 
@@ -217,13 +213,27 @@ class Reticulum:
                     try:
                         if ("interface_enabled" in c) and c.as_bool("interface_enabled") == True:
                             if c["type"] == "UDPInterface":
+                                device       = c["device"] if "device" in c else None
+                                port         = int(c["port"]) if "port" in c else None
+                                listen_ip    = c["listen_ip"] if "listen_ip" in c else None
+                                listen_port  = int(c["listen_port"]) if "listen_port" in c else None
+                                forward_ip   = c["forward_ip"] if "forward_ip" in c else None
+                                forward_port = int(c["forward_port"]) if "forward_port" in c else None
+
+                                if port != None:
+                                    if listen_port == None:
+                                        listen_port = port
+                                    if forward_port == None:
+                                        forward_port = port
+
                                 interface = UDPInterface.UDPInterface(
                                     RNS.Transport,
                                     name,
-                                    c["listen_ip"],
-                                    int(c["listen_port"]),
-                                    c["forward_ip"],
-                                    int(c["forward_port"])
+                                    device,
+                                    listen_ip,
+                                    listen_port,
+                                    forward_ip,
+                                    forward_port
                                 )
 
                                 if "outgoing" in c and c.as_bool("outgoing") == True:
@@ -235,11 +245,20 @@ class Reticulum:
 
 
                             if c["type"] == "TCPServerInterface":
+                                device       = c["device"] if "device" in c else None
+                                port         = int(c["port"]) if "port" in c else None
+                                listen_ip    = c["listen_ip"] if "listen_ip" in c else None
+                                listen_port  = int(c["listen_port"]) if "listen_port" in c else None
+
+                                if port != None:
+                                    listen_port = port
+
                                 interface = TCPInterface.TCPServerInterface(
                                     RNS.Transport,
                                     name,
-                                    c["listen_ip"],
-                                    int(c["listen_port"])
+                                    device,
+                                    listen_ip,
+                                    listen_port
                                 )
 
                                 if "outgoing" in c and c.as_bool("outgoing") == True:
@@ -432,16 +451,6 @@ class Reticulum:
         self.config.write()
         self.__apply_config()
 
-    @staticmethod
-    def should_allow_unencrypted():
-        """
-        Returns whether unencrypted links are allowed by the
-        current configuration.
-
-        :returns: True if the current running configuration allows downgrading links to plaintext. False if not.
-        """
-        return Reticulum.__allow_unencrypted
-
     @staticmethod
     def should_use_implicit_proof():
         """
@@ -472,20 +481,12 @@ __default_rns_config__ = '''# This is the default Reticulum config file.
 
 [reticulum]
 
-# Don't allow unencrypted links by default.
-# If you REALLY need to allow unencrypted links, for example
-# for debug or regulatory purposes, this can be set to true.
-# This directive is optional and can be removed for brevity.
-
-allow_unencrypted = False
-
-
 # If you enable Transport, your system will route traffic
 # for other peers, pass announces and serve path requests.
-# Unless you really know what you're doing, this should be
-# done only for systems that are suited to act as transport
-# nodes, ie. if they are stationary and always-on. This
-# directive is optional and can be removed for brevity.
+# This should be done for systems that are suited to act
+# as transport nodes, ie. if they are stationary and
+# always-on. This directive is optional and can be removed
+# for brevity.
 
 enable_transport = False
 
@@ -533,11 +534,11 @@ loglevel = 4
 [interfaces]
 
   # This interface enables communication with other
-  # Reticulum nodes on your local ethernet networks.
-  # It's enabled by default, and provides basic
-  # connectivity to other peers in your local ethernet
-  # broadcast domain. You can modify it to suit your
-  # needs or turn it off completely.
+  # local Reticulum nodes over UDP. You can modify it
+  # to suit your needs or turn it off completely.
+  # As a minimum, you should probably specify the
+  # network device you want to communicate on, such
+  # as eth0 or wlan0.
   
   [[Default UDP Interface]]
     type = UDPInterface
@@ -548,6 +549,38 @@ loglevel = 4
     forward_ip = 255.255.255.255
     forward_port = 4242
 
+    # The above configuration will allow communication
+    # within the local broadcast domains of all local
+    # IP interfaces. This is enabled by default as an
+    # easy way to get started, but you might want to
+    # consider altering it to something more specific.
+
+    # Instead of specifying listen_ip, listen_port,
+    # forward_ip and forward_port, you can also bind
+    # to a specific network device like below.
+
+    # device = eth0
+    # port = 4242
+
+    # Assuming the eth0 device has the address
+    # 10.55.0.72/24, the above configuration would
+    # be equivalent to the following manual setup.
+    # Note that we are both listening and forwarding to
+    # the broadcast address of the network segments.
+
+    # listen_ip = 10.55.0.255
+    # listen_port = 4242
+    # forward_ip = 10.55.0.255
+    # forward_port = 4242
+
+    # You can of course also communicate only with
+    # a single IP address
+
+    # listen_ip = 10.55.0.15
+    # listen_port = 4242
+    # forward_ip = 10.55.0.16
+    # forward_port = 4242
+
 
   # This example demonstrates a TCP server interface.
   # It will listen for incoming connections on the
@@ -557,9 +590,23 @@ loglevel = 4
     type = TCPServerInterface
     interface_enabled = False
     outgoing = True
+
+    # This configuration will listen on all IP
+    # interfaces on port 4242
+    
     listen_ip = 0.0.0.0
     listen_port = 4242
 
+    # Alternatively you can bind to a specific IP
+    
+    # listen_ip = 10.0.0.88
+    # listen_port = 4242
+
+    # Or a specific network device
+    
+    # device = eth0
+    # port = 4242
+
 
   # To connect to a TCP server interface, you would
   # naturally use the TCP client interface. Here's

RNS/Transport.py

@@ -9,6 +9,10 @@ from time import sleep
 from .vendor import umsgpack as umsgpack
 
 class Transport:
+    """
+    Through static methods of this class you can interact with Reticulums
+    Transport system.
+    """
     # Constants
     BROADCAST    = 0x00;
     TRANSPORT    = 0x01;
@@ -22,9 +26,10 @@ class Transport:
 
     APP_NAME = "rnstransport"
 
-    # TODO: Document the addition of random windows
-    # and max local rebroadcasts.
-    PATHFINDER_M    = 18        # Max hops
+    PATHFINDER_M    = 128       # Max hops
+    """
+    Maximum amount of hops that Reticulum will transport a packet.
+    """
     PATHFINDER_C    = 2.0       # Decay constant
     PATHFINDER_R    = 1         # Retransmit retries
     PATHFINDER_T    = 10        # Retry grace period
@@ -51,6 +56,8 @@ class Transport:
     receipts             = []         # Receipts of all outgoing packets for proof processing
 
     # TODO: "destination_table" should really be renamed to "path_table"
+    # Notes on memory usage: 1 megabyte of memory can store approximately
+    # 55.100 path table entries or approximately 22.300 link table entries.
     announce_table       = {}         # A table for storing announces currently waiting to be retransmitted
     destination_table    = {}         # A lookup table containing the next hop to a given destination
     reverse_table        = {}         # A lookup table for storing packet hashes used to return proofs and replies
@@ -108,7 +115,7 @@ class Transport:
 
         # Create transport-specific destinations
         Transport.path_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
-        Transport.path_request_destination.packet_callback(Transport.path_request_handler)
+        Transport.path_request_destination.set_packet_callback(Transport.path_request_handler)
         Transport.control_destinations.append(Transport.path_request_destination)
         Transport.control_hashes.append(Transport.path_request_destination.hash)
 
@@ -180,7 +187,7 @@ class Transport:
                     while len(Transport.receipts) > Transport.MAX_RECEIPTS:
                         culled_receipt = Transport.receipts.pop(0)
                         culled_receipt.timeout = -1
-                        receipt.check_timeout()
+                        culled_receipt.check_timeout()
 
                     for receipt in Transport.receipts:
                         receipt.check_timeout()
@@ -246,8 +253,8 @@ class Transport:
 
 
                 # Cull the packet hashlist if it has reached max size
-                while (len(Transport.packet_hashlist) > Transport.hashlist_maxsize):
-                    Transport.packet_hashlist.pop(0)
+                if len(Transport.packet_hashlist) > Transport.hashlist_maxsize:
+                    Transport.packet_hashlist = Transport.packet_hashlist[len(Transport.packet_hashlist)-Transport.hashlist_maxsize:len(Transport.packet_hashlist)-1]
 
                 if time.time() > Transport.tables_last_culled + Transport.tables_cull_interval:
                     # Cull the reverse table according to timeout
@@ -338,8 +345,6 @@ class Transport:
                     new_raw += packet.raw[1:2]
                     new_raw += Transport.destination_table[packet.destination_hash][1]
                     new_raw += packet.raw[2:]
-                    # TODO: Remove at some point
-                    # RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
                     outbound_interface.processOutgoing(new_raw)
                     Transport.destination_table[packet.destination_hash][0] = time.time()
                     sent = True
@@ -359,8 +364,6 @@ class Transport:
                     new_raw += packet.raw[1:2]
                     new_raw += Transport.destination_table[packet.destination_hash][1]
                     new_raw += packet.raw[2:]
-                    # TODO: Remove at some point
-                    # RNS.log("Packet was inserted into transport via "+RNS.prettyhexrep(Transport.destination_table[packet.destination_hash][1])+" on: "+str(outbound_interface), RNS.LOG_EXTREME)
                     outbound_interface.processOutgoing(new_raw)
                     Transport.destination_table[packet.destination_hash][0] = time.time()
                     sent = True
@@ -377,6 +380,7 @@ class Transport:
         # just the relevant interface if the packet has an attached
         # interface, or belongs to a link.
         else:
+            stored_hash = False
             for interface in Transport.interfaces:
                 if interface.OUT:
                     should_transmit = True
@@ -389,8 +393,9 @@ class Transport:
                         should_transmit = False
                             
                     if should_transmit:
-                        RNS.log("Transmitting "+str(len(packet.raw))+" bytes on: "+str(interface), RNS.LOG_EXTREME)
-                        RNS.log("Hash is "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
+                        if not stored_hash:
+                            Transport.packet_hashlist.append(packet.packet_hash)
+
                         interface.processOutgoing(packet.raw)
                         sent = True
 
@@ -398,7 +403,7 @@ class Transport:
             packet.sent = True
             packet.sent_at = time.time()
 
-                # Don't generate receipt if it has been explicitly disabled
+            # Don't generate receipt if it has been explicitly disabled
             if (packet.create_receipt == True and
                 # Only generate receipts for DATA packets
                 packet.packet_type == RNS.Packet.DATA and
@@ -447,8 +452,7 @@ class Transport:
     @staticmethod
     def inbound(raw, interface=None):
         while (Transport.jobs_running):
-            # TODO: Decrease this for performance
-            sleep(0.1)
+            sleep(0.01)
             
         Transport.jobs_locked = True
         
@@ -457,8 +461,6 @@ class Transport:
         packet.receiving_interface = interface
         packet.hops += 1
 
-        RNS.log(str(interface)+" received packet with hash "+RNS.prettyhexrep(packet.packet_hash), RNS.LOG_EXTREME)
-
         if len(Transport.local_client_interfaces) > 0:
 
             if Transport.is_local_client_interface(interface):
@@ -523,11 +525,10 @@ class Transport:
                 # accordingly if we are.
                 if packet.transport_id != None and packet.packet_type != RNS.Packet.ANNOUNCE:
                     if packet.transport_id == Transport.identity.hash:
-                        RNS.log("Received packet in transport for "+RNS.prettyhexrep(packet.destination_hash)+" with matching transport ID, transporting it...", RNS.LOG_DEBUG)
                         if packet.destination_hash in Transport.destination_table:
                             next_hop = Transport.destination_table[packet.destination_hash][1]
                             remaining_hops = Transport.destination_table[packet.destination_hash][2]
-                            RNS.log("Next hop to destination is "+RNS.prettyhexrep(next_hop)+" with "+str(remaining_hops)+" hops remaining, transporting it.", RNS.LOG_DEBUG)
+                            
                             if remaining_hops > 1:
                                 # Just increase hop count and transmit
                                 new_raw  = packet.raw[0:1]
@@ -652,7 +653,7 @@ class Transport:
                     # First, check that the announce is not for a destination
                     # local to this system, and that hops are less than the max
                     if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
-                        random_blob = packet.data[RNS.Identity.DERKEYSIZE//8+10:RNS.Identity.DERKEYSIZE//8+20]
+                        random_blob = packet.data[RNS.Identity.KEYSIZE//8+10:RNS.Identity.KEYSIZE//8+20]
                         random_blobs = []
                         if packet.destination_hash in Transport.destination_table:
                             random_blobs = Transport.destination_table[packet.destination_hash][4]
@@ -734,19 +735,39 @@ class Transport:
                                 announce_context = RNS.Packet.NONE
                                 announce_data = packet.data
 
-                                new_announce = RNS.Packet(
-                                    announce_destination,
-                                    announce_data,
-                                    RNS.Packet.ANNOUNCE,
-                                    context = announce_context,
-                                    header_type = RNS.Packet.HEADER_2,
-                                    transport_type = Transport.TRANSPORT,
-                                    transport_id = Transport.identity.hash,
-                                    attached_interface = attached_interface
-                                )
+                                if Transport.from_local_client(packet) and packet.context == RNS.Packet.PATH_RESPONSE:
+                                    for interface in Transport.interfaces:
+                                        if packet.receiving_interface != interface:
+                                            new_announce = RNS.Packet(
+                                                announce_destination,
+                                                announce_data,
+                                                RNS.Packet.ANNOUNCE,
+                                                context = announce_context,
+                                                header_type = RNS.Packet.HEADER_2,
+                                                transport_type = Transport.TRANSPORT,
+                                                transport_id = Transport.identity.hash,
+                                                attached_interface = interface
+                                            )
+                                            
+                                            new_announce.hops = packet.hops
+                                            new_announce.send()
+
+                                else:
+                                    for local_interface in Transport.local_client_interfaces:
+                                        new_announce = RNS.Packet(
+                                            announce_destination,
+                                            announce_data,
+                                            RNS.Packet.ANNOUNCE,
+                                            context = announce_context,
+                                            header_type = RNS.Packet.HEADER_2,
+                                            transport_type = Transport.TRANSPORT,
+                                            transport_id = Transport.identity.hash,
+                                            attached_interface = local_interface
+                                        )
+
+                                        new_announce.hops = packet.hops
+                                        new_announce.send()
 
-                                new_announce.hops = packet.hops
-                                new_announce.send()
 
                             Transport.destination_table[packet.destination_hash] = [now, received_from, announce_hops, expires, random_blobs, packet.receiving_interface, packet]
                             RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" is now "+str(announce_hops)+" hops away via "+RNS.prettyhexrep(received_from)+" on "+str(packet.receiving_interface), RNS.LOG_VERBOSE)
@@ -864,12 +885,16 @@ class Transport:
                             if receipt.hash == proof_hash:
                                 receipt_validated = receipt.validate_proof_packet(packet)
                         else:
+                            # TODO: This looks like it should actually
+                            # be rewritten when implicit proofs are added.
+
                             # In case of an implicit proof, we have
                             # to check every single outstanding receipt
                             receipt_validated = receipt.validate_proof_packet(packet)
 
                         if receipt_validated:
-                            Transport.receipts.remove(receipt)
+                            if receipt in Transport.receipts:
+                                Transport.receipts.remove(receipt)
 
         Transport.jobs_locked = False
 
@@ -880,8 +905,13 @@ class Transport:
             for registered_destination in Transport.destinations:
                 if destination.hash == registered_destination.hash:
                     raise KeyError("Attempt to register an already registered destination.")
+            
             Transport.destinations.append(destination)
 
+            if Transport.owner.is_connected_to_shared_instance:
+                if destination.type == RNS.Destination.SINGLE:
+                    destination.announce(path_response=True)
+
     @staticmethod
     def deregister_destination(destination):
         if destination in Transport.destinations:
@@ -1028,6 +1058,17 @@ class Transport:
         else:
             return False
 
+    @staticmethod
+    def hops_to(destination_hash):
+        """
+        :param destination_hash: A destination hash as *bytes*.
+        :returns: The number of hops to the specified destination, or ``RNS.Transport.PATHFINDER_M`` if the number of hops is unknown.
+        """
+        if destination_hash in Transport.destination_table:
+            return Transport.destination_table[destination_hash][2]
+        else:
+            return Transport.PATHFINDER_M
+
     @staticmethod
     def request_path(destination_hash):
         """
@@ -1138,13 +1179,17 @@ class Transport:
 
     @staticmethod
     def exit_handler():
-        RNS.log("Saving packet hashlist to storage...", RNS.LOG_VERBOSE)
         try:
+            if not RNS.Reticulum.transport_enabled():
+                Transport.packet_hashlist = []
+            else:
+                RNS.log("Saving packet hashlist to storage...", RNS.LOG_VERBOSE)
+
             packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
             file = open(packet_hashlist_path, "wb")
             file.write(umsgpack.packb(Transport.packet_hashlist))
             file.close()
-            RNS.log("Done packet hashlist to storage", RNS.LOG_VERBOSE)
+
         except Exception as e:
             RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
 

RNS/__init__.py

@@ -5,14 +5,16 @@ import time
 import random
 import threading
 
+from ._version import __version__
+
 from .Reticulum import Reticulum
 from .Identity import Identity
-from .Link import Link
+from .Link import Link, RequestReceipt
 from .Transport import Transport
 from .Destination import Destination
 from .Packet import Packet
 from .Packet import PacketReceipt
-from .Resource import Resource
+from .Resource import Resource, ResourceAdvertisement
 
 modules = glob.glob(os.path.dirname(__file__)+"/*.py")
 __all__ = [ os.path.basename(f)[:-3] for f in modules if not f.endswith('__init__.py')]
@@ -60,6 +62,9 @@ def loglevelname(level):
     
     return "Unknown"
 
+def version():
+    return __version__
+
 def log(msg, level=3, _override_destination = False):
     global _always_override_destination
     
@@ -68,7 +73,7 @@ def log(msg, level=3, _override_destination = False):
         logstring = "["+time.strftime(logtimefmt)+"] ["+loglevelname(level)+"] "+msg
         logging_lock.acquire()
 
-        if (logdest == LOG_STDOUT or _always_override_destination):
+        if (logdest == LOG_STDOUT or _always_override_destination or _override_destination):
             print(logstring)
             logging_lock.release()
 

RNS/_version.py

@@ -0,0 +1 @@
+__version__ = "0.2.4"

RNS/vendor/configobj.py

@@ -19,7 +19,7 @@ import sys
 
 from codecs import BOM_UTF8, BOM_UTF16, BOM_UTF16_BE, BOM_UTF16_LE
 
-import six
+import RNS.vendor.six as six
 __version__ = '5.0.6'
 
 # imported lazily to avoid startup performance hit if it isn't used

RNS/vendor/six.py

@@ -0,0 +1,998 @@
+# Copyright (c) 2010-2020 Benjamin Peterson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+"""Utilities for writing code that runs on Python 2 and 3"""
+
+from __future__ import absolute_import
+
+import functools
+import itertools
+import operator
+import sys
+import types
+
+__author__ = "Benjamin Peterson <benjamin@python.org>"
+__version__ = "1.16.0"
+
+
+# Useful for very coarse version differentiation.
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+PY34 = sys.version_info[0:2] >= (3, 4)
+
+if PY3:
+    string_types = str,
+    integer_types = int,
+    class_types = type,
+    text_type = str
+    binary_type = bytes
+
+    MAXSIZE = sys.maxsize
+else:
+    string_types = basestring,
+    integer_types = (int, long)
+    class_types = (type, types.ClassType)
+    text_type = unicode
+    binary_type = str
+
+    if sys.platform.startswith("java"):
+        # Jython always uses 32 bits.
+        MAXSIZE = int((1 << 31) - 1)
+    else:
+        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
+        class X(object):
+
+            def __len__(self):
+                return 1 << 31
+        try:
+            len(X())
+        except OverflowError:
+            # 32-bit
+            MAXSIZE = int((1 << 31) - 1)
+        else:
+            # 64-bit
+            MAXSIZE = int((1 << 63) - 1)
+        del X
+
+if PY34:
+    from importlib.util import spec_from_loader
+else:
+    spec_from_loader = None
+
+
+def _add_doc(func, doc):
+    """Add documentation to a function."""
+    func.__doc__ = doc
+
+
+def _import_module(name):
+    """Import module, returning the module after the last dot."""
+    __import__(name)
+    return sys.modules[name]
+
+
+class _LazyDescr(object):
+
+    def __init__(self, name):
+        self.name = name
+
+    def __get__(self, obj, tp):
+        result = self._resolve()
+        setattr(obj, self.name, result)  # Invokes __set__.
+        try:
+            # This is a bit ugly, but it avoids running this again by
+            # removing this descriptor.
+            delattr(obj.__class__, self.name)
+        except AttributeError:
+            pass
+        return result
+
+
+class MovedModule(_LazyDescr):
+
+    def __init__(self, name, old, new=None):
+        super(MovedModule, self).__init__(name)
+        if PY3:
+            if new is None:
+                new = name
+            self.mod = new
+        else:
+            self.mod = old
+
+    def _resolve(self):
+        return _import_module(self.mod)
+
+    def __getattr__(self, attr):
+        _module = self._resolve()
+        value = getattr(_module, attr)
+        setattr(self, attr, value)
+        return value
+
+
+class _LazyModule(types.ModuleType):
+
+    def __init__(self, name):
+        super(_LazyModule, self).__init__(name)
+        self.__doc__ = self.__class__.__doc__
+
+    def __dir__(self):
+        attrs = ["__doc__", "__name__"]
+        attrs += [attr.name for attr in self._moved_attributes]
+        return attrs
+
+    # Subclasses should override this
+    _moved_attributes = []
+
+
+class MovedAttribute(_LazyDescr):
+
+    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
+        super(MovedAttribute, self).__init__(name)
+        if PY3:
+            if new_mod is None:
+                new_mod = name
+            self.mod = new_mod
+            if new_attr is None:
+                if old_attr is None:
+                    new_attr = name
+                else:
+                    new_attr = old_attr
+            self.attr = new_attr
+        else:
+            self.mod = old_mod
+            if old_attr is None:
+                old_attr = name
+            self.attr = old_attr
+
+    def _resolve(self):
+        module = _import_module(self.mod)
+        return getattr(module, self.attr)
+
+
+class _SixMetaPathImporter(object):
+
+    """
+    A meta path importer to import six.moves and its submodules.
+
+    This class implements a PEP302 finder and loader. It should be compatible
+    with Python 2.5 and all existing versions of Python3
+    """
+
+    def __init__(self, six_module_name):
+        self.name = six_module_name
+        self.known_modules = {}
+
+    def _add_module(self, mod, *fullnames):
+        for fullname in fullnames:
+            self.known_modules[self.name + "." + fullname] = mod
+
+    def _get_module(self, fullname):
+        return self.known_modules[self.name + "." + fullname]
+
+    def find_module(self, fullname, path=None):
+        if fullname in self.known_modules:
+            return self
+        return None
+
+    def find_spec(self, fullname, path, target=None):
+        if fullname in self.known_modules:
+            return spec_from_loader(fullname, self)
+        return None
+
+    def __get_module(self, fullname):
+        try:
+            return self.known_modules[fullname]
+        except KeyError:
+            raise ImportError("This loader does not know module " + fullname)
+
+    def load_module(self, fullname):
+        try:
+            # in case of a reload
+            return sys.modules[fullname]
+        except KeyError:
+            pass
+        mod = self.__get_module(fullname)
+        if isinstance(mod, MovedModule):
+            mod = mod._resolve()
+        else:
+            mod.__loader__ = self
+        sys.modules[fullname] = mod
+        return mod
+
+    def is_package(self, fullname):
+        """
+        Return true, if the named module is a package.
+
+        We need this method to get correct spec objects with
+        Python 3.4 (see PEP451)
+        """
+        return hasattr(self.__get_module(fullname), "__path__")
+
+    def get_code(self, fullname):
+        """Return None
+
+        Required, if is_package is implemented"""
+        self.__get_module(fullname)  # eventually raises ImportError
+        return None
+    get_source = get_code  # same as get_code
+
+    def create_module(self, spec):
+        return self.load_module(spec.name)
+
+    def exec_module(self, module):
+        pass
+
+_importer = _SixMetaPathImporter(__name__)
+
+
+class _MovedItems(_LazyModule):
+
+    """Lazy loading of moved objects"""
+    __path__ = []  # mark as package
+
+
+_moved_attributes = [
+    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
+    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
+    MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
+    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
+    MovedAttribute("intern", "__builtin__", "sys"),
+    MovedAttribute("map", "itertools", "builtins", "imap", "map"),
+    MovedAttribute("getcwd", "os", "os", "getcwdu", "getcwd"),
+    MovedAttribute("getcwdb", "os", "os", "getcwd", "getcwdb"),
+    MovedAttribute("getoutput", "commands", "subprocess"),
+    MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("reload_module", "__builtin__", "importlib" if PY34 else "imp", "reload"),
+    MovedAttribute("reduce", "__builtin__", "functools"),
+    MovedAttribute("shlex_quote", "pipes", "shlex", "quote"),
+    MovedAttribute("StringIO", "StringIO", "io"),
+    MovedAttribute("UserDict", "UserDict", "collections"),
+    MovedAttribute("UserList", "UserList", "collections"),
+    MovedAttribute("UserString", "UserString", "collections"),
+    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
+    MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
+    MovedModule("builtins", "__builtin__"),
+    MovedModule("configparser", "ConfigParser"),
+    MovedModule("collections_abc", "collections", "collections.abc" if sys.version_info >= (3, 3) else "collections"),
+    MovedModule("copyreg", "copy_reg"),
+    MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
+    MovedModule("dbm_ndbm", "dbm", "dbm.ndbm"),
+    MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread" if sys.version_info < (3, 9) else "_thread"),
+    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
+    MovedModule("http_cookies", "Cookie", "http.cookies"),
+    MovedModule("html_entities", "htmlentitydefs", "html.entities"),
+    MovedModule("html_parser", "HTMLParser", "html.parser"),
+    MovedModule("http_client", "httplib", "http.client"),
+    MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
+    MovedModule("email_mime_image", "email.MIMEImage", "email.mime.image"),
+    MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
+    MovedModule("email_mime_nonmultipart", "email.MIMENonMultipart", "email.mime.nonmultipart"),
+    MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
+    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
+    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
+    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
+    MovedModule("cPickle", "cPickle", "pickle"),
+    MovedModule("queue", "Queue"),
+    MovedModule("reprlib", "repr"),
+    MovedModule("socketserver", "SocketServer"),
+    MovedModule("_thread", "thread", "_thread"),
+    MovedModule("tkinter", "Tkinter"),
+    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
+    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
+    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
+    MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
+    MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
+    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
+    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
+    MovedModule("tkinter_colorchooser", "tkColorChooser",
+                "tkinter.colorchooser"),
+    MovedModule("tkinter_commondialog", "tkCommonDialog",
+                "tkinter.commondialog"),
+    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_font", "tkFont", "tkinter.font"),
+    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
+    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
+                "tkinter.simpledialog"),
+    MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
+    MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
+    MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
+    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
+    MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
+    MovedModule("xmlrpc_server", "SimpleXMLRPCServer", "xmlrpc.server"),
+]
+# Add windows specific modules.
+if sys.platform == "win32":
+    _moved_attributes += [
+        MovedModule("winreg", "_winreg"),
+    ]
+
+for attr in _moved_attributes:
+    setattr(_MovedItems, attr.name, attr)
+    if isinstance(attr, MovedModule):
+        _importer._add_module(attr, "moves." + attr.name)
+del attr
+
+_MovedItems._moved_attributes = _moved_attributes
+
+moves = _MovedItems(__name__ + ".moves")
+_importer._add_module(moves, "moves")
+
+
+class Module_six_moves_urllib_parse(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_parse"""
+
+
+_urllib_parse_moved_attributes = [
+    MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
+    MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
+    MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
+    MovedAttribute("urljoin", "urlparse", "urllib.parse"),
+    MovedAttribute("urlparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("quote", "urllib", "urllib.parse"),
+    MovedAttribute("quote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("unquote", "urllib", "urllib.parse"),
+    MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("unquote_to_bytes", "urllib", "urllib.parse", "unquote", "unquote_to_bytes"),
+    MovedAttribute("urlencode", "urllib", "urllib.parse"),
+    MovedAttribute("splitquery", "urllib", "urllib.parse"),
+    MovedAttribute("splittag", "urllib", "urllib.parse"),
+    MovedAttribute("splituser", "urllib", "urllib.parse"),
+    MovedAttribute("splitvalue", "urllib", "urllib.parse"),
+    MovedAttribute("uses_fragment", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_netloc", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_params", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_query", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_relative", "urlparse", "urllib.parse"),
+]
+for attr in _urllib_parse_moved_attributes:
+    setattr(Module_six_moves_urllib_parse, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse"),
+                      "moves.urllib_parse", "moves.urllib.parse")
+
+
+class Module_six_moves_urllib_error(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_error"""
+
+
+_urllib_error_moved_attributes = [
+    MovedAttribute("URLError", "urllib2", "urllib.error"),
+    MovedAttribute("HTTPError", "urllib2", "urllib.error"),
+    MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
+]
+for attr in _urllib_error_moved_attributes:
+    setattr(Module_six_moves_urllib_error, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_error(__name__ + ".moves.urllib.error"),
+                      "moves.urllib_error", "moves.urllib.error")
+
+
+class Module_six_moves_urllib_request(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_request"""
+
+
+_urllib_request_moved_attributes = [
+    MovedAttribute("urlopen", "urllib2", "urllib.request"),
+    MovedAttribute("install_opener", "urllib2", "urllib.request"),
+    MovedAttribute("build_opener", "urllib2", "urllib.request"),
+    MovedAttribute("pathname2url", "urllib", "urllib.request"),
+    MovedAttribute("url2pathname", "urllib", "urllib.request"),
+    MovedAttribute("getproxies", "urllib", "urllib.request"),
+    MovedAttribute("Request", "urllib2", "urllib.request"),
+    MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
+    MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FileHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("urlretrieve", "urllib", "urllib.request"),
+    MovedAttribute("urlcleanup", "urllib", "urllib.request"),
+    MovedAttribute("URLopener", "urllib", "urllib.request"),
+    MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
+    MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
+    MovedAttribute("parse_http_list", "urllib2", "urllib.request"),
+    MovedAttribute("parse_keqv_list", "urllib2", "urllib.request"),
+]
+for attr in _urllib_request_moved_attributes:
+    setattr(Module_six_moves_urllib_request, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_request(__name__ + ".moves.urllib.request"),
+                      "moves.urllib_request", "moves.urllib.request")
+
+
+class Module_six_moves_urllib_response(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_response"""
+
+
+_urllib_response_moved_attributes = [
+    MovedAttribute("addbase", "urllib", "urllib.response"),
+    MovedAttribute("addclosehook", "urllib", "urllib.response"),
+    MovedAttribute("addinfo", "urllib", "urllib.response"),
+    MovedAttribute("addinfourl", "urllib", "urllib.response"),
+]
+for attr in _urllib_response_moved_attributes:
+    setattr(Module_six_moves_urllib_response, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_response(__name__ + ".moves.urllib.response"),
+                      "moves.urllib_response", "moves.urllib.response")
+
+
+class Module_six_moves_urllib_robotparser(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_robotparser"""
+
+
+_urllib_robotparser_moved_attributes = [
+    MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
+]
+for attr in _urllib_robotparser_moved_attributes:
+    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser"),
+                      "moves.urllib_robotparser", "moves.urllib.robotparser")
+
+
+class Module_six_moves_urllib(types.ModuleType):
+
+    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
+    __path__ = []  # mark as package
+    parse = _importer._get_module("moves.urllib_parse")
+    error = _importer._get_module("moves.urllib_error")
+    request = _importer._get_module("moves.urllib_request")
+    response = _importer._get_module("moves.urllib_response")
+    robotparser = _importer._get_module("moves.urllib_robotparser")
+
+    def __dir__(self):
+        return ['parse', 'error', 'request', 'response', 'robotparser']
+
+_importer._add_module(Module_six_moves_urllib(__name__ + ".moves.urllib"),
+                      "moves.urllib")
+
+
+def add_move(move):
+    """Add an item to six.moves."""
+    setattr(_MovedItems, move.name, move)
+
+
+def remove_move(name):
+    """Remove item from six.moves."""
+    try:
+        delattr(_MovedItems, name)
+    except AttributeError:
+        try:
+            del moves.__dict__[name]
+        except KeyError:
+            raise AttributeError("no such move, %r" % (name,))
+
+
+if PY3:
+    _meth_func = "__func__"
+    _meth_self = "__self__"
+
+    _func_closure = "__closure__"
+    _func_code = "__code__"
+    _func_defaults = "__defaults__"
+    _func_globals = "__globals__"
+else:
+    _meth_func = "im_func"
+    _meth_self = "im_self"
+
+    _func_closure = "func_closure"
+    _func_code = "func_code"
+    _func_defaults = "func_defaults"
+    _func_globals = "func_globals"
+
+
+try:
+    advance_iterator = next
+except NameError:
+    def advance_iterator(it):
+        return it.next()
+next = advance_iterator
+
+
+try:
+    callable = callable
+except NameError:
+    def callable(obj):
+        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
+
+
+if PY3:
+    def get_unbound_function(unbound):
+        return unbound
+
+    create_bound_method = types.MethodType
+
+    def create_unbound_method(func, cls):
+        return func
+
+    Iterator = object
+else:
+    def get_unbound_function(unbound):
+        return unbound.im_func
+
+    def create_bound_method(func, obj):
+        return types.MethodType(func, obj, obj.__class__)
+
+    def create_unbound_method(func, cls):
+        return types.MethodType(func, None, cls)
+
+    class Iterator(object):
+
+        def next(self):
+            return type(self).__next__(self)
+
+    callable = callable
+_add_doc(get_unbound_function,
+         """Get the function out of a possibly unbound function""")
+
+
+get_method_function = operator.attrgetter(_meth_func)
+get_method_self = operator.attrgetter(_meth_self)
+get_function_closure = operator.attrgetter(_func_closure)
+get_function_code = operator.attrgetter(_func_code)
+get_function_defaults = operator.attrgetter(_func_defaults)
+get_function_globals = operator.attrgetter(_func_globals)
+
+
+if PY3:
+    def iterkeys(d, **kw):
+        return iter(d.keys(**kw))
+
+    def itervalues(d, **kw):
+        return iter(d.values(**kw))
+
+    def iteritems(d, **kw):
+        return iter(d.items(**kw))
+
+    def iterlists(d, **kw):
+        return iter(d.lists(**kw))
+
+    viewkeys = operator.methodcaller("keys")
+
+    viewvalues = operator.methodcaller("values")
+
+    viewitems = operator.methodcaller("items")
+else:
+    def iterkeys(d, **kw):
+        return d.iterkeys(**kw)
+
+    def itervalues(d, **kw):
+        return d.itervalues(**kw)
+
+    def iteritems(d, **kw):
+        return d.iteritems(**kw)
+
+    def iterlists(d, **kw):
+        return d.iterlists(**kw)
+
+    viewkeys = operator.methodcaller("viewkeys")
+
+    viewvalues = operator.methodcaller("viewvalues")
+
+    viewitems = operator.methodcaller("viewitems")
+
+_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
+_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
+_add_doc(iteritems,
+         "Return an iterator over the (key, value) pairs of a dictionary.")
+_add_doc(iterlists,
+         "Return an iterator over the (key, [values]) pairs of a dictionary.")
+
+
+if PY3:
+    def b(s):
+        return s.encode("latin-1")
+
+    def u(s):
+        return s
+    unichr = chr
+    import struct
+    int2byte = struct.Struct(">B").pack
+    del struct
+    byte2int = operator.itemgetter(0)
+    indexbytes = operator.getitem
+    iterbytes = iter
+    import io
+    StringIO = io.StringIO
+    BytesIO = io.BytesIO
+    del io
+    _assertCountEqual = "assertCountEqual"
+    if sys.version_info[1] <= 1:
+        _assertRaisesRegex = "assertRaisesRegexp"
+        _assertRegex = "assertRegexpMatches"
+        _assertNotRegex = "assertNotRegexpMatches"
+    else:
+        _assertRaisesRegex = "assertRaisesRegex"
+        _assertRegex = "assertRegex"
+        _assertNotRegex = "assertNotRegex"
+else:
+    def b(s):
+        return s
+    # Workaround for standalone backslash
+
+    def u(s):
+        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
+    unichr = unichr
+    int2byte = chr
+
+    def byte2int(bs):
+        return ord(bs[0])
+
+    def indexbytes(buf, i):
+        return ord(buf[i])
+    iterbytes = functools.partial(itertools.imap, ord)
+    import StringIO
+    StringIO = BytesIO = StringIO.StringIO
+    _assertCountEqual = "assertItemsEqual"
+    _assertRaisesRegex = "assertRaisesRegexp"
+    _assertRegex = "assertRegexpMatches"
+    _assertNotRegex = "assertNotRegexpMatches"
+_add_doc(b, """Byte literal""")
+_add_doc(u, """Text literal""")
+
+
+def assertCountEqual(self, *args, **kwargs):
+    return getattr(self, _assertCountEqual)(*args, **kwargs)
+
+
+def assertRaisesRegex(self, *args, **kwargs):
+    return getattr(self, _assertRaisesRegex)(*args, **kwargs)
+
+
+def assertRegex(self, *args, **kwargs):
+    return getattr(self, _assertRegex)(*args, **kwargs)
+
+
+def assertNotRegex(self, *args, **kwargs):
+    return getattr(self, _assertNotRegex)(*args, **kwargs)
+
+
+if PY3:
+    exec_ = getattr(moves.builtins, "exec")
+
+    def reraise(tp, value, tb=None):
+        try:
+            if value is None:
+                value = tp()
+            if value.__traceback__ is not tb:
+                raise value.with_traceback(tb)
+            raise value
+        finally:
+            value = None
+            tb = None
+
+else:
+    def exec_(_code_, _globs_=None, _locs_=None):
+        """Execute code in a namespace."""
+        if _globs_ is None:
+            frame = sys._getframe(1)
+            _globs_ = frame.f_globals
+            if _locs_ is None:
+                _locs_ = frame.f_locals
+            del frame
+        elif _locs_ is None:
+            _locs_ = _globs_
+        exec("""exec _code_ in _globs_, _locs_""")
+
+    exec_("""def reraise(tp, value, tb=None):
+    try:
+        raise tp, value, tb
+    finally:
+        tb = None
+""")
+
+
+if sys.version_info[:2] > (3,):
+    exec_("""def raise_from(value, from_value):
+    try:
+        raise value from from_value
+    finally:
+        value = None
+""")
+else:
+    def raise_from(value, from_value):
+        raise value
+
+
+print_ = getattr(moves.builtins, "print", None)
+if print_ is None:
+    def print_(*args, **kwargs):
+        """The new-style print function for Python 2.4 and 2.5."""
+        fp = kwargs.pop("file", sys.stdout)
+        if fp is None:
+            return
+
+        def write(data):
+            if not isinstance(data, basestring):
+                data = str(data)
+            # If the file has an encoding, encode unicode with it.
+            if (isinstance(fp, file) and
+                    isinstance(data, unicode) and
+                    fp.encoding is not None):
+                errors = getattr(fp, "errors", None)
+                if errors is None:
+                    errors = "strict"
+                data = data.encode(fp.encoding, errors)
+            fp.write(data)
+        want_unicode = False
+        sep = kwargs.pop("sep", None)
+        if sep is not None:
+            if isinstance(sep, unicode):
+                want_unicode = True
+            elif not isinstance(sep, str):
+                raise TypeError("sep must be None or a string")
+        end = kwargs.pop("end", None)
+        if end is not None:
+            if isinstance(end, unicode):
+                want_unicode = True
+            elif not isinstance(end, str):
+                raise TypeError("end must be None or a string")
+        if kwargs:
+            raise TypeError("invalid keyword arguments to print()")
+        if not want_unicode:
+            for arg in args:
+                if isinstance(arg, unicode):
+                    want_unicode = True
+                    break
+        if want_unicode:
+            newline = unicode("\n")
+            space = unicode(" ")
+        else:
+            newline = "\n"
+            space = " "
+        if sep is None:
+            sep = space
+        if end is None:
+            end = newline
+        for i, arg in enumerate(args):
+            if i:
+                write(sep)
+            write(arg)
+        write(end)
+if sys.version_info[:2] < (3, 3):
+    _print = print_
+
+    def print_(*args, **kwargs):
+        fp = kwargs.get("file", sys.stdout)
+        flush = kwargs.pop("flush", False)
+        _print(*args, **kwargs)
+        if flush and fp is not None:
+            fp.flush()
+
+_add_doc(reraise, """Reraise an exception.""")
+
+if sys.version_info[0:2] < (3, 4):
+    # This does exactly the same what the :func:`py3:functools.update_wrapper`
+    # function does on Python versions after 3.2. It sets the ``__wrapped__``
+    # attribute on ``wrapper`` object and it doesn't raise an error if any of
+    # the attributes mentioned in ``assigned`` and ``updated`` are missing on
+    # ``wrapped`` object.
+    def _update_wrapper(wrapper, wrapped,
+                        assigned=functools.WRAPPER_ASSIGNMENTS,
+                        updated=functools.WRAPPER_UPDATES):
+        for attr in assigned:
+            try:
+                value = getattr(wrapped, attr)
+            except AttributeError:
+                continue
+            else:
+                setattr(wrapper, attr, value)
+        for attr in updated:
+            getattr(wrapper, attr).update(getattr(wrapped, attr, {}))
+        wrapper.__wrapped__ = wrapped
+        return wrapper
+    _update_wrapper.__doc__ = functools.update_wrapper.__doc__
+
+    def wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS,
+              updated=functools.WRAPPER_UPDATES):
+        return functools.partial(_update_wrapper, wrapped=wrapped,
+                                 assigned=assigned, updated=updated)
+    wraps.__doc__ = functools.wraps.__doc__
+
+else:
+    wraps = functools.wraps
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    # This requires a bit of explanation: the basic idea is to make a dummy
+    # metaclass for one level of class instantiation that replaces itself with
+    # the actual metaclass.
+    class metaclass(type):
+
+        def __new__(cls, name, this_bases, d):
+            if sys.version_info[:2] >= (3, 7):
+                # This version introduced PEP 560 that requires a bit
+                # of extra care (we mimic what is done by __build_class__).
+                resolved_bases = types.resolve_bases(bases)
+                if resolved_bases is not bases:
+                    d['__orig_bases__'] = bases
+            else:
+                resolved_bases = bases
+            return meta(name, resolved_bases, d)
+
+        @classmethod
+        def __prepare__(cls, name, this_bases):
+            return meta.__prepare__(name, bases)
+    return type.__new__(metaclass, 'temporary_class', (), {})
+
+
+def add_metaclass(metaclass):
+    """Class decorator for creating a class with a metaclass."""
+    def wrapper(cls):
+        orig_vars = cls.__dict__.copy()
+        slots = orig_vars.get('__slots__')
+        if slots is not None:
+            if isinstance(slots, str):
+                slots = [slots]
+            for slots_var in slots:
+                orig_vars.pop(slots_var)
+        orig_vars.pop('__dict__', None)
+        orig_vars.pop('__weakref__', None)
+        if hasattr(cls, '__qualname__'):
+            orig_vars['__qualname__'] = cls.__qualname__
+        return metaclass(cls.__name__, cls.__bases__, orig_vars)
+    return wrapper
+
+
+def ensure_binary(s, encoding='utf-8', errors='strict'):
+    """Coerce **s** to six.binary_type.
+
+    For Python 2:
+      - `unicode` -> encoded to `str`
+      - `str` -> `str`
+
+    For Python 3:
+      - `str` -> encoded to `bytes`
+      - `bytes` -> `bytes`
+    """
+    if isinstance(s, binary_type):
+        return s
+    if isinstance(s, text_type):
+        return s.encode(encoding, errors)
+    raise TypeError("not expecting type '%s'" % type(s))
+
+
+def ensure_str(s, encoding='utf-8', errors='strict'):
+    """Coerce *s* to `str`.
+
+    For Python 2:
+      - `unicode` -> encoded to `str`
+      - `str` -> `str`
+
+    For Python 3:
+      - `str` -> `str`
+      - `bytes` -> decoded to `str`
+    """
+    # Optimization: Fast return for the common case.
+    if type(s) is str:
+        return s
+    if PY2 and isinstance(s, text_type):
+        return s.encode(encoding, errors)
+    elif PY3 and isinstance(s, binary_type):
+        return s.decode(encoding, errors)
+    elif not isinstance(s, (text_type, binary_type)):
+        raise TypeError("not expecting type '%s'" % type(s))
+    return s
+
+
+def ensure_text(s, encoding='utf-8', errors='strict'):
+    """Coerce *s* to six.text_type.
+
+    For Python 2:
+      - `unicode` -> `unicode`
+      - `str` -> `unicode`
+
+    For Python 3:
+      - `str` -> `str`
+      - `bytes` -> decoded to `str`
+    """
+    if isinstance(s, binary_type):
+        return s.decode(encoding, errors)
+    elif isinstance(s, text_type):
+        return s
+    else:
+        raise TypeError("not expecting type '%s'" % type(s))
+
+
+def python_2_unicode_compatible(klass):
+    """
+    A class decorator that defines __unicode__ and __str__ methods under Python 2.
+    Under Python 3 it does nothing.
+
+    To support Python 2 and 3 with a single code base, define a __str__ method
+    returning text and apply this decorator to the class.
+    """
+    if PY2:
+        if '__str__' not in klass.__dict__:
+            raise ValueError("@python_2_unicode_compatible cannot be applied "
+                             "to %s because it doesn't define __str__()." %
+                             klass.__name__)
+        klass.__unicode__ = klass.__str__
+        klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
+    return klass
+
+
+# Complete the moves implementation.
+# This code is at the end of this module to speed up module loading.
+# Turn this module into a package.
+__path__ = []  # required for PEP 302 and PEP 451
+__package__ = __name__  # see PEP 366 @ReservedAssignment
+if globals().get("__spec__") is not None:
+    __spec__.submodule_search_locations = []  # PEP 451 @UndefinedVariable
+# Remove other six meta path importers, since they cause problems. This can
+# happen if six is removed from sys.modules and then reloaded. (Setuptools does
+# this for some reason.)
+if sys.meta_path:
+    for i, importer in enumerate(sys.meta_path):
+        # Here's some real nastiness: Another "instance" of the six module might
+        # be floating around. Therefore, we can't use isinstance() to check for
+        # the six meta path importer, since the other six instance will have
+        # inserted an importer with different class.
+        if (type(importer).__name__ == "_SixMetaPathImporter" and
+                importer.name == __name__):
+            del sys.meta_path[i]
+            break
+    del i, importer
+# Finally, add the importer to the meta path import hook.
+sys.meta_path.append(_importer)

docs/manual/.buildinfo

@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 010a10c5bc670583cef4151858e38839
+config: eda3a1317314f558917722e3479f8836
 tags: 645f666f9bcd5a90fca523b33c5a78b7

docs/manual/_sources/examples.rst.txt

@@ -68,6 +68,29 @@ destination, and passing traffic back and forth over the link.
 
 This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Link.py>`_.
 
+.. _example-identify:
+
+Identification
+==============
+
+The *Identify* example explores identifying an intiator of a link, once
+the link has been established.
+
+.. literalinclude:: ../../Examples/Identify.py
+
+This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Identify.py>`_.
+
+.. _example-request:
+
+Requests & Responses
+====================
+
+The *Request* example explores sendig requests and receiving responses.
+
+.. literalinclude:: ../../Examples/Request.py
+
+This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Request.py>`_.
+
 .. _example-filetransfer:
 
 Filetransfer

docs/manual/_sources/gettingstartedfast.rst.txt

@@ -1,7 +1,6 @@
 ********************
 Getting Started Fast
 ********************
-What do we want to do? Something! When do we want to do it? Right now! Let's go.
 
 The best way to get started with the Reticulum Network Stack depends on what
 you want to do. This guide will outline sensible starting paths for different
@@ -23,7 +22,7 @@ in the development for the messaging and information-sharing protocol
 Develop a Program with Reticulum
 ===========================================
 If you want to develop programs that use Reticulum, the easiest way to get
-started is to install Reticulum via pip:
+started is to install the latest release of Reticulum via pip:
 
 .. code::
 

docs/manual/_sources/index.rst.txt

@@ -10,9 +10,9 @@ the development of Reticulum itself.
 
    whatis
    gettingstartedfast
-   examples
-   reference
    understanding
+   reference
+   examples
 
 
 Indices and Tables

docs/manual/_sources/reference.rst.txt

@@ -39,7 +39,7 @@ Destination
 Packet
 ------
 
-.. autoclass:: RNS.Packet
+.. autoclass:: RNS.Packet(destination, data, create_receipt = True)
    :members:
 
 .. _api-packetreceipt:
@@ -47,7 +47,7 @@ Packet
 Packet Receipt
 --------------
 
-.. autoclass:: RNS.PacketReceipt
+.. autoclass:: RNS.PacketReceipt()
    :members:
 
 .. _api-link:
@@ -55,7 +55,15 @@ Packet Receipt
 Link
 ----
 
-.. autoclass:: RNS.Link
+.. autoclass:: RNS.Link(destination, established_callback=None, closed_callback = None)
+   :members:
+
+.. _api-requestreceipt:
+
+Request Receipt
+---------------
+
+.. autoclass:: RNS.RequestReceipt()
    :members:
 
 .. _api-resource:
@@ -63,7 +71,7 @@ Link
 Resource
 --------
 
-.. autoclass:: RNS.Resource
+.. autoclass:: RNS.Resource(data, link, advertise=True, auto_compress=True, callback=None, progress_callback=None, timeout=None)
    :members:
 
 .. _api-transport:

docs/manual/_sources/understanding.rst.txt

@@ -157,12 +157,16 @@ destinations. Reticulum uses three different basic destination types, and one sp
 Destination Naming
 ^^^^^^^^^^^^^^^^^^
 
-Destinations are created and named in an easy to understand dotted notation of *aspects* , and
+Destinations are created and named in an easy to understand dotted notation of *aspects*, and
 represented on the network as a hash of this value. The hash is a SHA-256 truncated to 80 bits. The
 top level aspect should always be a unique identifier for the application using the destination.
-The next levels of aspects can be defined in any way by the creator of the application. For example,
-a destination for a environmental monitoring application could be made up of the application name, a
-device type and measurement type, like this:
+The next levels of aspects can be defined in any way by the creator of the application.
+
+Aspects can be as long and as plentiful as required, and a resulting long destination name will not
+impact efficiency, as names are always represented as truncated SHA-256 hashes on the network.
+
+As an example, a destination for a environmental monitoring application could be made up of the
+application name, a device type and measurement type, like this:
 
 .. code-block:: text
 
@@ -201,9 +205,8 @@ To recap, the different destination types should be used in the following situat
 * **Single**
     When private communication between two endpoints is needed. Supports multiple hops.
 * **Group**
-    When private communication between two or more endpoints is needed. More efficient in
-    data usage than *single* destinations. Supports multiple hops indirectly, but must first be
-    established through a *single* destination.
+    When private communication between two or more endpoints is needed. Supports multiple hops
+    indirectly, but must first be established through a *single* destination.
 * **Plain**
     When plain-text communication is desirable, for example when broadcasting information.
 
@@ -214,9 +217,9 @@ an unknown public key from the network, as all participating nodes serve as a di
 of public keys.
 
 Note that public key information can be shared and verified in many other ways than using the
-built-in methodology, and that it is therefore not required to use the announce/request functionality.
-It is by far the easiest though, and should definitely be used if there is not a good reason for
-doing it differently.
+built-in *announce* functionality, and that it is therefore not required to use the announce/request
+functionality to obtain public keys. It is by far the easiest though, and should definitely be used
+if there is not a good reason for doing it differently.
 
 .. _understanding-keyannouncements:
 
@@ -235,7 +238,7 @@ contain the following information:
 * The announcers public key
 * Application specific data, in this case the users nickname and availability status
 * A random blob, making each new announce unique
-* A signature of the above information, verifying authenticity
+* An Ed25519 signature of the above information, verifying authenticity
 
 With this information, any Reticulum node that receives it will be able to reconstruct an outgoing
 destination to securely communicate with that destination. You might have noticed that there is one
@@ -244,8 +247,9 @@ the aspect names of the destination. These are intentionally left out to save ba
 will be implicit in almost all cases. If a destination name is not entirely implicit, information can be
 included in the application specific data part that will allow the receiver to infer the naming.
 
-It is important to note that announcements will be forwarded throughout the network according to a
-certain pattern. This will be detailed later.
+It is important to note that announces will be forwarded throughout the network according to a
+certain pattern. This will be detailed in the section
+:ref:`The Announce Mechanism in Detail<understanding-announce>`.
 
 Seeing how *single* destinations are always tied to a private/public key pair leads us to the next topic.
 
@@ -268,8 +272,8 @@ the identity first, and then link it to created destinations.
 
 Building upon the simple messenger example, we could use an identity to represent the user of the
 application. Destinations created will then be linked to this identity to allow communication to
-reach the user. In such a case it is of great importance to store the user’s identity securely and
-privately.
+reach the user. In all cases it is of great importance to store the private keys associated with any
+Reticulum Identity securely and privately.
 
 .. _understanding-gettingfurther:
 
@@ -279,8 +283,9 @@ Getting Further
 The above functions and principles form the core of Reticulum, and would suffice to create
 functional networked applications in local clusters, for example over radio links where all interested
 nodes can directly hear each other. But to be truly useful, we need a way to direct traffic over multiple
-hops in the network. In the next sections, two concepts that allow this will be introduced, *paths* and
-*links*.
+hops in the network.
+
+In the following sections, two concepts that allow this will be introduced, *paths* and *links*.
 
 .. _understanding-transport:
 
@@ -298,70 +303,28 @@ useable over bandwidth-limited, high-latency links.
 
 To overcome such challenges, Reticulum’s *Transport* system uses public-key cryptography to
 implement the concept of *paths* that allow discovery of how to get information to a certain
-destination, and *resources* that help make reliable data transfer more efficient.
+destination. It is important to note that no single node in a Reticulum network knows the complete
+path to a destination. Every Transport node participating in a Reticulum network will only
+know what the most direct way to get a packet one hop closer to it's destination is.
 
-.. _understanding-paths:
+.. _understanding-announce:
 
-Reaching the Destination
-------------------------
+The Announce Mechanism in Detail
+--------------------------------
 
-In networks with changing topology and trustless connectivity, nodes need a way to establish
-*verified connectivity* with each other. Since the network is assumed to be trustless, Reticulum
-must provide a way to guarantee that the peer you are communicating with is actually who you
-expect. To do this, the following process is employed:
+When an *announce* is transmitted by a node, it will be forwarded by any node receiving it, but
+according to some specific rules:
 
 
-* | First, the node that wishes to establish connectivity will send out a special packet, that
-    traverses the network and locates the desired destination. Along the way, the nodes that
-    forward the packet will take note of this *link request*.
+* | If this exact announce has already been received before, ignore it.
 
-* | Second, if the destination accepts the *link request* , it will send back a packet that proves the
-    authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
-    nodes that initially forwarded the packet will also be able to verify this proof, and thus
-    accept the validity of the *link* throughout the network.
-
-* | When the validity of the *link* has been accepted by forwarding nodes, these nodes will
-    remember the *link* , and it can subsequently be used by referring to a hash representing it.
-
-* | As a part of the *link request* , a Diffie-Hellman key exchange takes place, that sets up an
-    efficient symmetrically encrypted tunnel between the two nodes, using elliptic curve
-    cryptography. As such, this mode of communication is preferred, even for situations when
-    nodes can directly communicate, when the amount of data to be exchanged numbers in the
-    tens of packets.
-
-* | When a *link* has been set up, it automatically provides message receipt functionality, so the
-    sending node can obtain verified confirmation that the information reached the intended
-    recipient.
-
-In a moment, we will discuss the specifics of how this methodology is implemented, but let’s first
-recap what purposes this serves. We first ensure that the node answering our request is actually the
-one we want to communicate with, and not a malicious actor pretending to be so. At the same time
-we establish an efficient encrypted channel. The setup of this is relatively cheap in terms of
-bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will also
-rotate encryption keys, but the link can also be kept alive for longer periods of time, if this is
-more suitable to the application. The amount of bandwidth used on keeping a link open is practically
-negligible. The procedure also inserts the *link id* , a hash calculated from the link request packet,
-into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each
-other simply by referring to this *link id*.
-
-Step 1: Pathfinding
-^^^^^^^^^^^^^^^^^^^
-
-The pathfinding method builds on the *announce* functionality discussed earlier. When an announce
-is sent out by a node, it will be forwarded by any node receiving it, but according to some specific
-rules:
-
-
-* | If this announce has already been received before, ignore it.
-
-* | Record into a table which node the announce was received from, and how many times in
+* | If not, record into a table which node the announce was received from, and how many times in
     total it has been retransmitted to get here.
 
 * | If the announce has been retransmitted *m+1* times, it will not be forwarded. By default, *m* is
     set to 18.
 
-* | The announce will be assigned a delay *d* = c\ :sup:`h` seconds, where *c* is a decay constant, by
-    default 2, and *h* is the amount of times this packet has already been forwarded.
+* | The announce will be assigned a delay *d* = c\ :sup:`h` seconds, where *c* is a decay constant, and *h* is the amount of times this packet has already been forwarded.
 
 * | The packet will be given a priority *p = 1/d*.
 
@@ -370,10 +333,11 @@ rules:
     not utilized by other traffic, the announce will be forwarded.
 
 * | If no other nodes are heard retransmitting the announce with a greater hop count than when
-    it left this node, transmitting it will be retried *r* times. By default, *r* is set to 2. Retries follow
-    same rules as above, with the exception that it must wait for at least *d* = c\ :sup:`h+1` + t seconds, ie.,
-    the amount of time it would take the next node to retransmit the packet. By default, *t* is set to
-    10.
+    it left this node, transmitting it will be retried *r* times. By default, *r* is set to 1. Retries
+    follow same rules as above, with the exception that it must wait for at least *d* = c\ :sup:`h+1` +
+    t + rand(0, rw) seconds. This amount of time is equal to the amount of time it would take the next
+    node to retransmit the packet, plus a random window. By default, *t* is set to 10 seconds, and the
+    random window *rw* is set to 10 seconds.
 
 * | If a newer announce from the same destination arrives, while an identical one is already in
     the queue, the newest announce is discarded. If the newest announce contains different
@@ -392,14 +356,95 @@ distance of *Lavg =* 15 kilometers, an announce will be able to propagate outwar
 kilometers in 34 minutes, and a *maximum announce radius* of 270 kilometers in approximately 3
 days.
 
-Step 2: Link Establishment
-^^^^^^^^^^^^^^^^^^^^^^^^^^
+.. _understanding-paths:
 
-After seeing how the conditions for finding a path through the network are created, we will now
-explore how two nodes can establish reliable communications over multiple hops. The *link* in
-Reticulum terminology should not be viewed as a direct node-to-node link on the physical layer, but
-as an abstract channel, that can be open for any amount of time, and can span an arbitrary number
-of hops, where information will be exchanged between two nodes.
+Reaching the Destination
+------------------------
+
+In networks with changing topology and trustless connectivity, nodes need a way to establish
+*verified connectivity* with each other. Since the network is assumed to be trustless, Reticulum
+must provide a way to guarantee that the peer you are communicating with is actually who you
+expect. Reticulum offers two ways to do this.
+
+For exchanges of small amounts of information, Reticulum offers the *Packet* API, which works exactly like you would expect - on a per packet level. The following process is employed when sending a packet:
+
+* | A packet is always created with an associated destination and some payload data. When the packet is sent
+    to a *single* destination type, Reticulum will automatically create an ephemeral encryption key, perform
+    an ECDH key exchange with the destinations public key, and encrypt the information.
+
+* | It is important to note that this key exchange does not require any network traffic. The sender already
+    knows the public key of the destination from an earlier received *announce*, and can thus perform the ECDH
+    key exchange locally, before sending the packet.
+
+* | The public part of the newly generated ephemeral key-pair is included with the encrypted token, and sent
+    along with the encrypted payload data in the packet.
+
+* | When the destination receives the packet, it can itself perform an ECDH key exchange and decrypt the
+    packet.
+
+* | A new ephemeral key is used for every packet sent in this way, and forward secrecy is guaranteed on a
+    per packet level.
+
+* | Once the packet has been received and decrypted by the addressed destination, that destination can opt
+    to *prove* its receipt of the packet. It does this by calculating the SHA-256 hash of the received packet,
+    and signing this hash with it's Ed25519 signing key. Transport nodes in the network can then direct this
+    *proof* back to the packets origin, where the signature can be verified against the destinations known
+    public signing key.
+
+* | In case the packet is addressed to a *group* destination type, the packet will be encrypted with the
+    pre-shared AES-128 key associated with the destination. In case the packet is addressed to a *plain*
+    destination type, the payload data will not be encrypted. Neither of these two destination types offer
+    forward secrecy. In general, it is recommended to always use the *single* destination type, unless it is
+    strictly necessary to use one of the others.
+
+
+For exchanges of larger amounts of data, or when longer sessions of bidirectional communication is desired, Reticulum offers the *Link* API. To establish a *link*, the following process is employed:
+
+* | First, the node that wishes to establish a link will send out a special packet, that
+    traverses the network and locates the desired destination. Along the way, the nodes that
+    forward the packet will take note of this *link request*.
+
+* | Second, if the destination accepts the *link request* , it will send back a packet that proves the
+    authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
+    nodes that initially forwarded the packet will also be able to verify this proof, and thus
+    accept the validity of the *link* throughout the network.
+
+* | When the validity of the *link* has been accepted by forwarding nodes, these nodes will
+    remember the *link* , and it can subsequently be used by referring to a hash representing it.
+
+* | As a part of the *link request* , a Diffie-Hellman key exchange takes place, that sets up an
+    efficiently encrypted tunnel between the two nodes, using elliptic curve cryptography. As such,
+    this mode of communication is preferred, even for situations when nodes can directly communicate,
+    when the amount of data to be exchanged numbers in the tens of packets.
+
+* | When a *link* has been set up, it automatically provides message receipt functionality, through
+    the same *proof* mechanism discussed before, so the sending node can obtain verified confirmation
+    that the information reached the intended recipient.
+
+In a moment, we will discuss the details of how this methodology is implemented, but let’s first
+recap what purposes this methodology serves. We first ensure that the node answering our request
+is actually the one we want to communicate with, and not a malicious actor pretending to be so.
+At the same time we establish an efficient encrypted channel. The setup of this is relatively cheap in
+terms of bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will
+also rotate encryption keys. The link can also be kept alive for longer periods of time, if this is
+more suitable to the application. The procedure also inserts the *link id* , a hash calculated from the link request packet, into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each other simply by referring to this *link id*.
+
+The combined bandwidth cost of setting up a link is 3 packets totalling 237 bytes (more info in the
+:ref:`Binary Packet Format<understanding-packetformat>` section). The amount of bandwidth used on keeping
+a link open is practically negligible, at 0.62 bits per second. Even on a slow 1200 bits per second packet
+radio channel, 100 concurrent links will still leave 95% channel capacity for actual data.
+
+
+Link Establishment in Detail
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+After exploring the basics of the announce mechanism, finding a path through the network, and an overview
+of the link establishment procedure, this section will go into greater detail about the Reticulum link
+establishment process.
+
+The *link* in Reticulum terminology should not be viewed as a direct node-to-node link on the
+physical layer, but as an abstract channel, that can be open for any amount of time, and can span
+an arbitrary number of hops, where information will be exchanged between two nodes.
 
 
 * | When a node in the network wants to establish verified connectivity with another node, it
@@ -412,25 +457,25 @@ of hops, where information will be exchanged between two nodes.
     considered as single public key for simplicity in this explanation.*
 
 * | The *link request* is addressed to the destination hash of the desired destination, and
-    contains the following data: The newly generated X25519 public key *LKi*. The contents 
-    are encrypted with the RSA public key of the destination and tramsitted over the network.
+    contains the following data: The newly generated X25519 public key *LKi*.
 
 * | The broadcasted packet will be directed through the network according to the rules laid out
     previously.
 
 * | Any node that forwards the link request will store a *link id* in it’s *link table* , along with the
     amount of hops the packet had taken when received. The link id is a hash of the entire link
-    request packet. If the path is not *proven* within some set amount of time, the entry will be
-    dropped from the *link table* again.
+    request packet. If the link request packet is not *proven* by the addressed destination within some
+    set amount of time, the entry will be dropped from the *link table* again.
 
-* | When the destination receives the link request packet, it will decrypt it and decide whether to
-    accept the request. If it is accepted, the destination will also generate a new X25519 private/public
-    key pair, and perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used
-    to encrypt the channel, once it has been established.
+* | When the destination receives the link request packet, it will decide whether to accept the request.
+    If it is accepted, the destination will also generate a new X25519 private/public key pair, and
+    perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used to encrypt the
+    channel, once it has been established.
 
 * | A *link proof* packet is now constructed and transmitted over the network. This packet is
     addressed to the *link id* of the *link*. It contains the following data: The newly generated X25519
-    public key *LKr* and an RSA-1024 signature of the *link id* and *LKr*.
+    public key *LKr* and an Ed25519 signature of the *link id* and *LKr* made by the signing key of
+    the addressed destination.
    
 * | By verifying this *link proof* packet, all nodes that originally transported the *link request*
     packet to the destination from the originator can now verify that the intended destination received
@@ -556,6 +601,8 @@ the light of Reticulums goal of equal access, doing so would need to be the subj
 investigation of the consequences first.
 
 
+.. _understanding-packetformat:
+
 Binary Packet Format
 --------------------
 
@@ -651,8 +698,8 @@ Binary Packet Format
      wire size including all fields.
 
      - Path Request    :    33  bytes
-     - Announce        :    323 bytes
-     - Link Request    :    141 bytes
-     - Link Proof      :    205 bytes
-     - Link RTT packet :    86  bytes
+     - Announce        :    151 bytes
+     - Link Request    :    77  bytes
+     - Link Proof      :    77  bytes
+     - Link RTT packet :    83  bytes
      - Link keepalive  :    14  bytes

docs/manual/_sources/whatis.rst.txt

@@ -2,7 +2,9 @@
 What is Reticulum?
 ******************
 
-Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth. Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.
+Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth.
+
+Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.
 
 Reticulum is a complete networking stack, and does not use IP or higher layers, although it is easy to utilise IP (with TCP or UDP) as the underlying carrier for Reticulum. It is therefore trivial to tunnel Reticulum over the Internet or private IP networks. Reticulum is built directly on cryptographic principles, allowing resilience and stable functionality in open and trustless networks.
 
@@ -25,11 +27,11 @@ What does Reticulum Offer?
 
 * Fully self-configuring multi-hop routing
 
-* Asymmetric RSA encryption and signatures as basis for all communication
+* Asymmetric X25519 encryption and Ed25519 signatures as a basis for all communication
 
-* Perfect Forward Secrecy on links with ephemereal Elliptic Curve Diffie-Hellman keys (on Curve25519)
+* Forward Secrecy with ephemereal Elliptic Curve Diffie-Hellman keys on Curve25519
 
-* Reticulum uses the Fernet specification for encryption on links and to group destinations
+* Reticulum uses the `Fernet <https://github.com/fernet/spec/blob/master/Spec.md>`_ specification for encryption
 
   * AES-128 in CBC mode with PKCS7 padding
 
@@ -37,11 +39,13 @@ What does Reticulum Offer?
 
   * IVs are generated through os.urandom()
 
+  * Keys are ephemeral and derived from an ECDH key exchange on Curve25519
+
 * Unforgeable packet delivery confirmations
 
 * A variety of supported interface types
 
-* An intuitive and easy-to-use API
+* An intuitive and developer-friendly API
 
 * Reliable and efficient transfer of arbritrary amounts of data
 
@@ -51,10 +55,16 @@ What does Reticulum Offer?
 
   * The API is very easy to use, and provides transfer progress
 
+* Efficient link establishment
+
+  * Total bandwidth cost of setting up a link is only 3 packets, totalling 237 bytes
+
+  * Low cost of keeping links open at only 0.62 bits per second
+
 
 Where can Reticulum be Used?
 ============================
-On practically any hardware that can support at least a half-duplex channel
+Over practically any medium that can support at least a half-duplex channel
 with 1.000 bits per second throughput, and an MTU of 500 bytes. Data radios,
 modems, LoRa radios, serial lines, AX.25 TNCs, amateur radio digital modes,
 ad-hoc WiFi, free-space optical links and similar systems are all examples

docs/manual/_static/documentation_options.js

@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '0.2.0 beta',
+    VERSION: '0.2.4 beta',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',

docs/manual/examples.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Examples &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Examples &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -16,8 +16,7 @@
     
     <link rel="index" title="Index" href="genindex.html" />
     <link rel="search" title="Search" href="search.html" />
-    <link rel="next" title="API Reference" href="reference.html" />
-    <link rel="prev" title="Getting Started Fast" href="gettingstartedfast.html" /> 
+    <link rel="prev" title="API Reference" href="reference.html" /> 
   </head><body>
     <div class="related" role="navigation" aria-label="related navigation">
       <h3>Navigation</h3>
@@ -27,11 +26,8 @@
              accesskey="I">index</a></li>
         <li class="right" >
           <a href="reference.html" title="API Reference"
-             accesskey="N">next</a> |</li>
-        <li class="right" >
-          <a href="gettingstartedfast.html" title="Getting Started Fast"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Examples</a></li> 
       </ul>
     </div>  
@@ -380,7 +376,7 @@ over the network.</p>
 
     <span class="c1"># We specify a callback that will get called every time</span>
     <span class="c1"># the destination receives data.</span>
-    <span class="n">broadcast_destination</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">packet_callback</span><span class="p">)</span>
+    <span class="n">broadcast_destination</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">packet_callback</span><span class="p">)</span>
     
     <span class="c1"># Everything&#39;s ready!</span>
     <span class="c1"># Let&#39;s hand over control to the main loop</span>
@@ -522,7 +518,7 @@ the Packet interface.</p>
     <span class="c1"># Tell the destination which function in our program to</span>
     <span class="c1"># run when a packet is received. We do this so we can</span>
     <span class="c1"># print a log message when the server receives a request</span>
-    <span class="n">echo_destination</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">server_callback</span><span class="p">)</span>
+    <span class="n">echo_destination</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">server_callback</span><span class="p">)</span>
 
     <span class="c1"># Everything&#39;s ready!</span>
     <span class="c1"># Let&#39;s Wait for client requests or user input</span>
@@ -640,12 +636,12 @@ the Packet interface.</p>
             <span class="c1"># the packet times out.</span>
             <span class="k">if</span> <span class="n">timeout</span> <span class="o">!=</span> <span class="kc">None</span><span class="p">:</span>
                 <span class="n">packet_receipt</span><span class="o">.</span><span class="n">set_timeout</span><span class="p">(</span><span class="n">timeout</span><span class="p">)</span>
-                <span class="n">packet_receipt</span><span class="o">.</span><span class="n">timeout_callback</span><span class="p">(</span><span class="n">packet_timed_out</span><span class="p">)</span>
+                <span class="n">packet_receipt</span><span class="o">.</span><span class="n">set_timeout_callback</span><span class="p">(</span><span class="n">packet_timed_out</span><span class="p">)</span>
 
             <span class="c1"># We can then set a delivery callback on the receipt.</span>
             <span class="c1"># This will get automatically called when a proof for</span>
             <span class="c1"># this specific packet is received from the destination.</span>
-            <span class="n">packet_receipt</span><span class="o">.</span><span class="n">delivery_callback</span><span class="p">(</span><span class="n">packet_delivered</span><span class="p">)</span>
+            <span class="n">packet_receipt</span><span class="o">.</span><span class="n">set_delivery_callback</span><span class="p">(</span><span class="n">packet_delivered</span><span class="p">)</span>
 
             <span class="c1"># Tell the user that the echo request was sent</span>
             <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Sent echo request to &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">request_destination</span><span class="o">.</span><span class="n">hash</span><span class="p">))</span>
@@ -659,7 +655,7 @@ the Packet interface.</p>
 <span class="c1"># receives a proof packet.</span>
 <span class="k">def</span> <span class="nf">packet_delivered</span><span class="p">(</span><span class="n">receipt</span><span class="p">):</span>
     <span class="k">if</span> <span class="n">receipt</span><span class="o">.</span><span class="n">status</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">PacketReceipt</span><span class="o">.</span><span class="n">DELIVERED</span><span class="p">:</span>
-        <span class="n">rtt</span> <span class="o">=</span> <span class="n">receipt</span><span class="o">.</span><span class="n">rtt</span><span class="p">()</span>
+        <span class="n">rtt</span> <span class="o">=</span> <span class="n">receipt</span><span class="o">.</span><span class="n">get_rtt</span><span class="p">()</span>
         <span class="k">if</span> <span class="p">(</span><span class="n">rtt</span> <span class="o">&gt;=</span> <span class="mi">1</span><span class="p">):</span>
             <span class="n">rtt</span> <span class="o">=</span> <span class="nb">round</span><span class="p">(</span><span class="n">rtt</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
             <span class="n">rttstring</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">rtt</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; seconds&quot;</span>
@@ -803,7 +799,7 @@ destination, and passing traffic back and forth over the link.</p>
 
     <span class="c1"># We configure a function that will get called every time</span>
     <span class="c1"># a new client creates a link to this destination.</span>
-    <span class="n">server_destination</span><span class="o">.</span><span class="n">link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
+    <span class="n">server_destination</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
 
     <span class="c1"># Everything&#39;s ready!</span>
     <span class="c1"># Let&#39;s Wait for client requests or user input</span>
@@ -835,8 +831,8 @@ destination, and passing traffic back and forth over the link.</p>
     <span class="k">global</span> <span class="n">latest_client_link</span>
 
     <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client connected&quot;</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">server_packet_received</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">server_packet_received</span><span class="p">)</span>
     <span class="n">latest_client_link</span> <span class="o">=</span> <span class="n">link</span>
 
 <span class="k">def</span> <span class="nf">client_disconnected</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
@@ -908,12 +904,12 @@ destination, and passing traffic back and forth over the link.</p>
     <span class="c1"># We set a callback that will get executed</span>
     <span class="c1"># every time a packet is received over the</span>
     <span class="c1"># link</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">client_packet_received</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">client_packet_received</span><span class="p">)</span>
 
     <span class="c1"># We&#39;ll also set up functions to inform the</span>
     <span class="c1"># user when the link is established or closed</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
 
     <span class="c1"># Everything is set up, so let&#39;s enter a loop</span>
     <span class="c1"># for the user to interact with the example</span>
@@ -940,8 +936,18 @@ destination, and passing traffic back and forth over the link.</p>
             <span class="c1"># If not, send the entered text over the link</span>
             <span class="k">if</span> <span class="n">text</span> <span class="o">!=</span> <span class="s2">&quot;&quot;</span><span class="p">:</span>
                 <span class="n">data</span> <span class="o">=</span> <span class="n">text</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
-                <span class="n">RNS</span><span class="o">.</span><span class="n">Packet</span><span class="p">(</span><span class="n">server_link</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span><span class="o">.</span><span class="n">send</span><span class="p">()</span>
+                <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">MDU</span><span class="p">:</span>
+                    <span class="n">RNS</span><span class="o">.</span><span class="n">Packet</span><span class="p">(</span><span class="n">server_link</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span><span class="o">.</span><span class="n">send</span><span class="p">()</span>
+                <span class="k">else</span><span class="p">:</span>
+                    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span>
+                        <span class="s2">&quot;Cannot send this packet, the data size of &quot;</span><span class="o">+</span>
+                        <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">))</span><span class="o">+</span><span class="s2">&quot; bytes exceeds the link packet MDU of &quot;</span><span class="o">+</span>
+                        <span class="nb">str</span><span class="p">(</span><span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">MDU</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; bytes&quot;</span><span class="p">,</span>
+                        <span class="n">RNS</span><span class="o">.</span><span class="n">LOG_ERROR</span>
+                    <span class="p">)</span>
+
         <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+            <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Error while sending data over the link: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
             <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">True</span>
             <span class="n">server_link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
 
@@ -1038,6 +1044,614 @@ destination, and passing traffic back and forth over the link.</p>
 </div>
 <p>This example can also be found at <a class="reference external" href="https://github.com/markqvist/Reticulum/blob/master/Examples/Link.py">https://github.com/markqvist/Reticulum/blob/master/Examples/Link.py</a>.</p>
 </div>
+<div class="section" id="example-identify">
+<span id="identification"></span><h2>Identification<a class="headerlink" href="#example-identify" title="Permalink to this headline">¶</a></h2>
+<p>The <em>Identify</em> example explores identifying an intiator of a link, once
+the link has been established.</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">##########################################################</span>
+<span class="c1"># This RNS example demonstrates how to set up a link to  #</span>
+<span class="c1"># a destination, and identify the initiator to it&#39;s peer #</span>
+<span class="c1">##########################################################</span>
+
+<span class="kn">import</span> <span class="nn">os</span>
+<span class="kn">import</span> <span class="nn">sys</span>
+<span class="kn">import</span> <span class="nn">time</span>
+<span class="kn">import</span> <span class="nn">argparse</span>
+<span class="kn">import</span> <span class="nn">RNS</span>
+
+<span class="c1"># Let&#39;s define an app name. We&#39;ll use this for all</span>
+<span class="c1"># destinations we create. Since this echo example</span>
+<span class="c1"># is part of a range of example utilities, we&#39;ll put</span>
+<span class="c1"># them all within the app namespace &quot;example_utilities&quot;</span>
+<span class="n">APP_NAME</span> <span class="o">=</span> <span class="s2">&quot;example_utilities&quot;</span>
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Server Part #########################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># A reference to the latest client link that connected</span>
+<span class="n">latest_client_link</span> <span class="o">=</span> <span class="kc">None</span>
+
+<span class="c1"># This initialisation is executed when the users chooses</span>
+<span class="c1"># to run as a server</span>
+<span class="k">def</span> <span class="nf">server</span><span class="p">(</span><span class="n">configpath</span><span class="p">):</span>
+    <span class="c1"># We must first initialise Reticulum</span>
+    <span class="n">reticulum</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="p">(</span><span class="n">configpath</span><span class="p">)</span>
+    
+    <span class="c1"># Randomly create a new identity for our link example</span>
+    <span class="n">server_identity</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Identity</span><span class="p">()</span>
+
+    <span class="c1"># We create a destination that clients can connect to. We</span>
+    <span class="c1"># want clients to create links to this destination, so we</span>
+    <span class="c1"># need to create a &quot;single&quot; destination type.</span>
+    <span class="n">server_destination</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="p">(</span>
+        <span class="n">server_identity</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">IN</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">SINGLE</span><span class="p">,</span>
+        <span class="n">APP_NAME</span><span class="p">,</span>
+        <span class="s2">&quot;identifyexample&quot;</span>
+    <span class="p">)</span>
+
+    <span class="c1"># We configure a function that will get called every time</span>
+    <span class="c1"># a new client creates a link to this destination.</span>
+    <span class="n">server_destination</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
+
+    <span class="c1"># Everything&#39;s ready!</span>
+    <span class="c1"># Let&#39;s Wait for client requests or user input</span>
+    <span class="n">server_loop</span><span class="p">(</span><span class="n">server_destination</span><span class="p">)</span>
+
+<span class="k">def</span> <span class="nf">server_loop</span><span class="p">(</span><span class="n">destination</span><span class="p">):</span>
+    <span class="c1"># Let the user know that everything is ready</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span>
+        <span class="s2">&quot;Link identification example &quot;</span><span class="o">+</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">destination</span><span class="o">.</span><span class="n">hash</span><span class="p">)</span><span class="o">+</span>
+        <span class="s2">&quot; running, waiting for a connection.&quot;</span>
+    <span class="p">)</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Hit enter to manually send an announce (Ctrl-C to quit)&quot;</span><span class="p">)</span>
+
+    <span class="c1"># We enter a loop that runs until the users exits.</span>
+    <span class="c1"># If the user hits enter, we will announce our server</span>
+    <span class="c1"># destination on the network, which will let clients</span>
+    <span class="c1"># know how to create messages directed towards it.</span>
+    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
+        <span class="n">entered</span> <span class="o">=</span> <span class="nb">input</span><span class="p">()</span>
+        <span class="n">destination</span><span class="o">.</span><span class="n">announce</span><span class="p">()</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Sent announce from &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">destination</span><span class="o">.</span><span class="n">hash</span><span class="p">))</span>
+
+<span class="c1"># When a client establishes a link to our server</span>
+<span class="c1"># destination, this function will be called with</span>
+<span class="c1"># a reference to the link.</span>
+<span class="k">def</span> <span class="nf">client_connected</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="k">global</span> <span class="n">latest_client_link</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client connected&quot;</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">server_packet_received</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_remote_identified_callback</span><span class="p">(</span><span class="n">remote_identified</span><span class="p">)</span>
+    <span class="n">latest_client_link</span> <span class="o">=</span> <span class="n">link</span>
+
+<span class="k">def</span> <span class="nf">client_disconnected</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client disconnected&quot;</span><span class="p">)</span>
+
+<span class="k">def</span> <span class="nf">remote_identified</span><span class="p">(</span><span class="n">identity</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Remote identified as: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">identity</span><span class="p">))</span>
+
+<span class="k">def</span> <span class="nf">server_packet_received</span><span class="p">(</span><span class="n">message</span><span class="p">,</span> <span class="n">packet</span><span class="p">):</span>
+    <span class="k">global</span> <span class="n">latest_client_link</span>
+
+    <span class="c1"># Get the originating identity for display</span>
+    <span class="n">remote_peer</span> <span class="o">=</span>  <span class="s2">&quot;unidentified peer&quot;</span>
+    <span class="k">if</span> <span class="n">packet</span><span class="o">.</span><span class="n">link</span><span class="o">.</span><span class="n">get_remote_identity</span><span class="p">()</span> <span class="o">!=</span> <span class="kc">None</span><span class="p">:</span>
+        <span class="n">remote_peer</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">packet</span><span class="o">.</span><span class="n">link</span><span class="o">.</span><span class="n">get_remote_identity</span><span class="p">())</span>
+
+    <span class="c1"># When data is received over any active link,</span>
+    <span class="c1"># it will all be directed to the last client</span>
+    <span class="c1"># that connected.</span>
+    <span class="n">text</span> <span class="o">=</span> <span class="n">message</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Received data from &quot;</span><span class="o">+</span><span class="n">remote_peer</span><span class="o">+</span><span class="s2">&quot;: &quot;</span><span class="o">+</span><span class="n">text</span><span class="p">)</span>
+    
+    <span class="n">reply_text</span> <span class="o">=</span> <span class="s2">&quot;I received </span><span class="se">\&quot;</span><span class="s2">&quot;</span><span class="o">+</span><span class="n">text</span><span class="o">+</span><span class="s2">&quot;</span><span class="se">\&quot;</span><span class="s2"> over the link from &quot;</span><span class="o">+</span><span class="n">remote_peer</span>
+    <span class="n">reply_data</span> <span class="o">=</span> <span class="n">reply_text</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">Packet</span><span class="p">(</span><span class="n">latest_client_link</span><span class="p">,</span> <span class="n">reply_data</span><span class="p">)</span><span class="o">.</span><span class="n">send</span><span class="p">()</span>
+
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Client Part #########################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># A reference to the server link</span>
+<span class="n">server_link</span> <span class="o">=</span> <span class="kc">None</span>
+
+<span class="c1"># A reference to the client identity</span>
+<span class="n">client_identity</span> <span class="o">=</span> <span class="kc">None</span>
+
+<span class="c1"># This initialisation is executed when the users chooses</span>
+<span class="c1"># to run as a client</span>
+<span class="k">def</span> <span class="nf">client</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">,</span> <span class="n">configpath</span><span class="p">):</span>
+    <span class="k">global</span> <span class="n">client_identity</span>
+    <span class="c1"># We need a binary representation of the destination</span>
+    <span class="c1"># hash that was entered on the command line</span>
+    <span class="k">try</span><span class="p">:</span>
+        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">20</span><span class="p">:</span>
+            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">&quot;Destination length is invalid, must be 20 hexadecimal characters (10 bytes)&quot;</span><span class="p">)</span>
+        <span class="n">destination_hash</span> <span class="o">=</span> <span class="nb">bytes</span><span class="o">.</span><span class="n">fromhex</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">)</span>
+    <span class="k">except</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Invalid destination entered. Check your input!</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">)</span>
+        <span class="n">exit</span><span class="p">()</span>
+
+    <span class="c1"># We must first initialise Reticulum</span>
+    <span class="n">reticulum</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="p">(</span><span class="n">configpath</span><span class="p">)</span>
+
+    <span class="c1"># Create a new client identity</span>
+    <span class="n">client_identity</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Identity</span><span class="p">()</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span>
+        <span class="s2">&quot;Client created new identity &quot;</span><span class="o">+</span>
+        <span class="nb">str</span><span class="p">(</span><span class="n">client_identity</span><span class="p">)</span>
+    <span class="p">)</span>
+
+    <span class="c1"># Check if we know a path to the destination</span>
+    <span class="k">if</span> <span class="ow">not</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">has_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">):</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Destination is not yet known. Requesting path and waiting for announce to arrive...&quot;</span><span class="p">)</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">request_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">)</span>
+        <span class="k">while</span> <span class="ow">not</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">has_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">):</span>
+            <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
+
+    <span class="c1"># Recall the server identity</span>
+    <span class="n">server_identity</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Identity</span><span class="o">.</span><span class="n">recall</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">)</span>
+
+    <span class="c1"># Inform the user that we&#39;ll begin connecting</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Establishing link with server...&quot;</span><span class="p">)</span>
+
+    <span class="c1"># When the server identity is known, we set</span>
+    <span class="c1"># up a destination</span>
+    <span class="n">server_destination</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="p">(</span>
+        <span class="n">server_identity</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">OUT</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">SINGLE</span><span class="p">,</span>
+        <span class="n">APP_NAME</span><span class="p">,</span>
+        <span class="s2">&quot;identifyexample&quot;</span>
+    <span class="p">)</span>
+
+    <span class="c1"># And create a link</span>
+    <span class="n">link</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="p">(</span><span class="n">server_destination</span><span class="p">)</span>
+
+    <span class="c1"># We set a callback that will get executed</span>
+    <span class="c1"># every time a packet is received over the</span>
+    <span class="c1"># link</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">client_packet_received</span><span class="p">)</span>
+
+    <span class="c1"># We&#39;ll also set up functions to inform the</span>
+    <span class="c1"># user when the link is established or closed</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
+
+    <span class="c1"># Everything is set up, so let&#39;s enter a loop</span>
+    <span class="c1"># for the user to interact with the example</span>
+    <span class="n">client_loop</span><span class="p">()</span>
+
+<span class="k">def</span> <span class="nf">client_loop</span><span class="p">():</span>
+    <span class="k">global</span> <span class="n">server_link</span>
+
+    <span class="c1"># Wait for the link to become active</span>
+    <span class="k">while</span> <span class="ow">not</span> <span class="n">server_link</span><span class="p">:</span>
+        <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
+
+    <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">False</span>
+    <span class="k">while</span> <span class="ow">not</span> <span class="n">should_quit</span><span class="p">:</span>
+        <span class="k">try</span><span class="p">:</span>
+            <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&gt; &quot;</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s2">&quot; &quot;</span><span class="p">)</span>
+            <span class="n">text</span> <span class="o">=</span> <span class="nb">input</span><span class="p">()</span>
+
+            <span class="c1"># Check if we should quit the example</span>
+            <span class="k">if</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;quit&quot;</span> <span class="ow">or</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;q&quot;</span> <span class="ow">or</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;exit&quot;</span><span class="p">:</span>
+                <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">True</span>
+                <span class="n">server_link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
+
+            <span class="c1"># If not, send the entered text over the link</span>
+            <span class="k">if</span> <span class="n">text</span> <span class="o">!=</span> <span class="s2">&quot;&quot;</span><span class="p">:</span>
+                <span class="n">data</span> <span class="o">=</span> <span class="n">text</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+                <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">MDU</span><span class="p">:</span>
+                    <span class="n">RNS</span><span class="o">.</span><span class="n">Packet</span><span class="p">(</span><span class="n">server_link</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span><span class="o">.</span><span class="n">send</span><span class="p">()</span>
+                <span class="k">else</span><span class="p">:</span>
+                    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span>
+                        <span class="s2">&quot;Cannot send this packet, the data size of &quot;</span><span class="o">+</span>
+                        <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">))</span><span class="o">+</span><span class="s2">&quot; bytes exceeds the link packet MDU of &quot;</span><span class="o">+</span>
+                        <span class="nb">str</span><span class="p">(</span><span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">MDU</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; bytes&quot;</span><span class="p">,</span>
+                        <span class="n">RNS</span><span class="o">.</span><span class="n">LOG_ERROR</span>
+                    <span class="p">)</span>
+
+        <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+            <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Error while sending data over the link: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
+            <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">True</span>
+            <span class="n">server_link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
+
+<span class="c1"># This function is called when a link</span>
+<span class="c1"># has been established with the server</span>
+<span class="k">def</span> <span class="nf">link_established</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="c1"># We store a reference to the link</span>
+    <span class="c1"># instance for later use</span>
+    <span class="k">global</span> <span class="n">server_link</span><span class="p">,</span> <span class="n">client_identity</span>
+    <span class="n">server_link</span> <span class="o">=</span> <span class="n">link</span>
+
+    <span class="c1"># Inform the user that the server is</span>
+    <span class="c1"># connected</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Link established with server, identifying to remote peer...&quot;</span><span class="p">)</span>
+
+    <span class="n">link</span><span class="o">.</span><span class="n">identify</span><span class="p">(</span><span class="n">client_identity</span><span class="p">)</span>
+
+<span class="c1"># When a link is closed, we&#39;ll inform the</span>
+<span class="c1"># user, and exit the program</span>
+<span class="k">def</span> <span class="nf">link_closed</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="k">if</span> <span class="n">link</span><span class="o">.</span><span class="n">teardown_reason</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">TIMEOUT</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The link timed out, exiting now&quot;</span><span class="p">)</span>
+    <span class="k">elif</span> <span class="n">link</span><span class="o">.</span><span class="n">teardown_reason</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">DESTINATION_CLOSED</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The link was closed by the server, exiting now&quot;</span><span class="p">)</span>
+    <span class="k">else</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Link closed, exiting now&quot;</span><span class="p">)</span>
+    
+    <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="o">.</span><span class="n">exit_handler</span><span class="p">()</span>
+    <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">1.5</span><span class="p">)</span>
+    <span class="n">os</span><span class="o">.</span><span class="n">_exit</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
+
+<span class="c1"># When a packet is received over the link, we</span>
+<span class="c1"># simply print out the data.</span>
+<span class="k">def</span> <span class="nf">client_packet_received</span><span class="p">(</span><span class="n">message</span><span class="p">,</span> <span class="n">packet</span><span class="p">):</span>
+    <span class="n">text</span> <span class="o">=</span> <span class="n">message</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Received data on the link: &quot;</span><span class="o">+</span><span class="n">text</span><span class="p">)</span>
+    <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&gt; &quot;</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s2">&quot; &quot;</span><span class="p">)</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
+
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Program Startup #####################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># This part of the program runs at startup,</span>
+<span class="c1"># and parses input of from the user, and then</span>
+<span class="c1"># starts up the desired program mode.</span>
+<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
+    <span class="k">try</span><span class="p">:</span>
+        <span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">(</span><span class="n">description</span><span class="o">=</span><span class="s2">&quot;Simple link example&quot;</span><span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;-s&quot;</span><span class="p">,</span>
+            <span class="s2">&quot;--server&quot;</span><span class="p">,</span>
+            <span class="n">action</span><span class="o">=</span><span class="s2">&quot;store_true&quot;</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;wait for incoming link requests from clients&quot;</span>
+        <span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;--config&quot;</span><span class="p">,</span>
+            <span class="n">action</span><span class="o">=</span><span class="s2">&quot;store&quot;</span><span class="p">,</span>
+            <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;path to alternative Reticulum config directory&quot;</span><span class="p">,</span>
+            <span class="nb">type</span><span class="o">=</span><span class="nb">str</span>
+        <span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;destination&quot;</span><span class="p">,</span>
+            <span class="n">nargs</span><span class="o">=</span><span class="s2">&quot;?&quot;</span><span class="p">,</span>
+            <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;hexadecimal hash of the server destination&quot;</span><span class="p">,</span>
+            <span class="nb">type</span><span class="o">=</span><span class="nb">str</span>
+        <span class="p">)</span>
+
+        <span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
+
+        <span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">config</span><span class="p">:</span>
+            <span class="n">configarg</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">config</span>
+        <span class="k">else</span><span class="p">:</span>
+            <span class="n">configarg</span> <span class="o">=</span> <span class="kc">None</span>
+
+        <span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">server</span><span class="p">:</span>
+            <span class="n">server</span><span class="p">(</span><span class="n">configarg</span><span class="p">)</span>
+        <span class="k">else</span><span class="p">:</span>
+            <span class="k">if</span> <span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">destination</span> <span class="o">==</span> <span class="kc">None</span><span class="p">):</span>
+                <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+                <span class="n">parser</span><span class="o">.</span><span class="n">print_help</span><span class="p">()</span>
+                <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+            <span class="k">else</span><span class="p">:</span>
+                <span class="n">client</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">destination</span><span class="p">,</span> <span class="n">configarg</span><span class="p">)</span>
+
+    <span class="k">except</span> <span class="ne">KeyboardInterrupt</span><span class="p">:</span>
+        <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+        <span class="n">exit</span><span class="p">()</span>
+</pre></div>
+</div>
+<p>This example can also be found at <a class="reference external" href="https://github.com/markqvist/Reticulum/blob/master/Examples/Identify.py">https://github.com/markqvist/Reticulum/blob/master/Examples/Identify.py</a>.</p>
+</div>
+<div class="section" id="requests-responses">
+<span id="example-request"></span><h2>Requests &amp; Responses<a class="headerlink" href="#requests-responses" title="Permalink to this headline">¶</a></h2>
+<p>The <em>Request</em> example explores sendig requests and receiving responses.</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">##########################################################</span>
+<span class="c1"># This RNS example demonstrates how to set perform       #</span>
+<span class="c1"># requests and receive responses over a link.            #</span>
+<span class="c1">##########################################################</span>
+
+<span class="kn">import</span> <span class="nn">os</span>
+<span class="kn">import</span> <span class="nn">sys</span>
+<span class="kn">import</span> <span class="nn">time</span>
+<span class="kn">import</span> <span class="nn">random</span>
+<span class="kn">import</span> <span class="nn">argparse</span>
+<span class="kn">import</span> <span class="nn">RNS</span>
+
+<span class="c1"># Let&#39;s define an app name. We&#39;ll use this for all</span>
+<span class="c1"># destinations we create. Since this echo example</span>
+<span class="c1"># is part of a range of example utilities, we&#39;ll put</span>
+<span class="c1"># them all within the app namespace &quot;example_utilities&quot;</span>
+<span class="n">APP_NAME</span> <span class="o">=</span> <span class="s2">&quot;example_utilities&quot;</span>
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Server Part #########################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># A reference to the latest client link that connected</span>
+<span class="n">latest_client_link</span> <span class="o">=</span> <span class="kc">None</span>
+
+<span class="k">def</span> <span class="nf">random_text_generator</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">request_id</span><span class="p">,</span> <span class="n">remote_identity</span><span class="p">,</span> <span class="n">requested_at</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Generating response to request &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">request_id</span><span class="p">))</span>
+    <span class="n">texts</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;They looked up&quot;</span><span class="p">,</span> <span class="s2">&quot;On each full moon&quot;</span><span class="p">,</span> <span class="s2">&quot;Becky was upset&quot;</span><span class="p">,</span> <span class="s2">&quot;I’ll stay away from it&quot;</span><span class="p">,</span> <span class="s2">&quot;The pet shop stocks everything&quot;</span><span class="p">]</span>
+    <span class="k">return</span> <span class="n">texts</span><span class="p">[</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">texts</span><span class="p">)</span><span class="o">-</span><span class="mi">1</span><span class="p">)]</span>
+
+<span class="c1"># This initialisation is executed when the users chooses</span>
+<span class="c1"># to run as a server</span>
+<span class="k">def</span> <span class="nf">server</span><span class="p">(</span><span class="n">configpath</span><span class="p">):</span>
+    <span class="c1"># We must first initialise Reticulum</span>
+    <span class="n">reticulum</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="p">(</span><span class="n">configpath</span><span class="p">)</span>
+    
+    <span class="c1"># Randomly create a new identity for our link example</span>
+    <span class="n">server_identity</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Identity</span><span class="p">()</span>
+
+    <span class="c1"># We create a destination that clients can connect to. We</span>
+    <span class="c1"># want clients to create links to this destination, so we</span>
+    <span class="c1"># need to create a &quot;single&quot; destination type.</span>
+    <span class="n">server_destination</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="p">(</span>
+        <span class="n">server_identity</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">IN</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">SINGLE</span><span class="p">,</span>
+        <span class="n">APP_NAME</span><span class="p">,</span>
+        <span class="s2">&quot;requestexample&quot;</span>
+    <span class="p">)</span>
+
+    <span class="c1"># We configure a function that will get called every time</span>
+    <span class="c1"># a new client creates a link to this destination.</span>
+    <span class="n">server_destination</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
+
+    <span class="c1"># We register a request handler for handling incoming</span>
+    <span class="c1"># requests over any established links.</span>
+    <span class="n">server_destination</span><span class="o">.</span><span class="n">register_request_handler</span><span class="p">(</span>
+        <span class="s2">&quot;/random/text&quot;</span><span class="p">,</span>
+        <span class="n">response_generator</span> <span class="o">=</span> <span class="n">random_text_generator</span><span class="p">,</span>
+        <span class="n">allow</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">ALLOW_ALL</span>
+    <span class="p">)</span>
+
+    <span class="c1"># Everything&#39;s ready!</span>
+    <span class="c1"># Let&#39;s Wait for client requests or user input</span>
+    <span class="n">server_loop</span><span class="p">(</span><span class="n">server_destination</span><span class="p">)</span>
+
+<span class="k">def</span> <span class="nf">server_loop</span><span class="p">(</span><span class="n">destination</span><span class="p">):</span>
+    <span class="c1"># Let the user know that everything is ready</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span>
+        <span class="s2">&quot;Request example &quot;</span><span class="o">+</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">destination</span><span class="o">.</span><span class="n">hash</span><span class="p">)</span><span class="o">+</span>
+        <span class="s2">&quot; running, waiting for a connection.&quot;</span>
+    <span class="p">)</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Hit enter to manually send an announce (Ctrl-C to quit)&quot;</span><span class="p">)</span>
+
+    <span class="c1"># We enter a loop that runs until the users exits.</span>
+    <span class="c1"># If the user hits enter, we will announce our server</span>
+    <span class="c1"># destination on the network, which will let clients</span>
+    <span class="c1"># know how to create messages directed towards it.</span>
+    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
+        <span class="n">entered</span> <span class="o">=</span> <span class="nb">input</span><span class="p">()</span>
+        <span class="n">destination</span><span class="o">.</span><span class="n">announce</span><span class="p">()</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Sent announce from &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">destination</span><span class="o">.</span><span class="n">hash</span><span class="p">))</span>
+
+<span class="c1"># When a client establishes a link to our server</span>
+<span class="c1"># destination, this function will be called with</span>
+<span class="c1"># a reference to the link.</span>
+<span class="k">def</span> <span class="nf">client_connected</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="k">global</span> <span class="n">latest_client_link</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client connected&quot;</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
+    <span class="n">latest_client_link</span> <span class="o">=</span> <span class="n">link</span>
+
+<span class="k">def</span> <span class="nf">client_disconnected</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client disconnected&quot;</span><span class="p">)</span>
+
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Client Part #########################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># A reference to the server link</span>
+<span class="n">server_link</span> <span class="o">=</span> <span class="kc">None</span>
+
+<span class="c1"># This initialisation is executed when the users chooses</span>
+<span class="c1"># to run as a client</span>
+<span class="k">def</span> <span class="nf">client</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">,</span> <span class="n">configpath</span><span class="p">):</span>
+    <span class="c1"># We need a binary representation of the destination</span>
+    <span class="c1"># hash that was entered on the command line</span>
+    <span class="k">try</span><span class="p">:</span>
+        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">20</span><span class="p">:</span>
+            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">&quot;Destination length is invalid, must be 20 hexadecimal characters (10 bytes)&quot;</span><span class="p">)</span>
+        <span class="n">destination_hash</span> <span class="o">=</span> <span class="nb">bytes</span><span class="o">.</span><span class="n">fromhex</span><span class="p">(</span><span class="n">destination_hexhash</span><span class="p">)</span>
+    <span class="k">except</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Invalid destination entered. Check your input!</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">)</span>
+        <span class="n">exit</span><span class="p">()</span>
+
+    <span class="c1"># We must first initialise Reticulum</span>
+    <span class="n">reticulum</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="p">(</span><span class="n">configpath</span><span class="p">)</span>
+
+    <span class="c1"># Check if we know a path to the destination</span>
+    <span class="k">if</span> <span class="ow">not</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">has_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">):</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Destination is not yet known. Requesting path and waiting for announce to arrive...&quot;</span><span class="p">)</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">request_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">)</span>
+        <span class="k">while</span> <span class="ow">not</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Transport</span><span class="o">.</span><span class="n">has_path</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">):</span>
+            <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
+
+    <span class="c1"># Recall the server identity</span>
+    <span class="n">server_identity</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Identity</span><span class="o">.</span><span class="n">recall</span><span class="p">(</span><span class="n">destination_hash</span><span class="p">)</span>
+
+    <span class="c1"># Inform the user that we&#39;ll begin connecting</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Establishing link with server...&quot;</span><span class="p">)</span>
+
+    <span class="c1"># When the server identity is known, we set</span>
+    <span class="c1"># up a destination</span>
+    <span class="n">server_destination</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="p">(</span>
+        <span class="n">server_identity</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">OUT</span><span class="p">,</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">Destination</span><span class="o">.</span><span class="n">SINGLE</span><span class="p">,</span>
+        <span class="n">APP_NAME</span><span class="p">,</span>
+        <span class="s2">&quot;requestexample&quot;</span>
+    <span class="p">)</span>
+
+    <span class="c1"># And create a link</span>
+    <span class="n">link</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="p">(</span><span class="n">server_destination</span><span class="p">)</span>
+
+    <span class="c1"># We&#39;ll set up functions to inform the</span>
+    <span class="c1"># user when the link is established or closed</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
+
+    <span class="c1"># Everything is set up, so let&#39;s enter a loop</span>
+    <span class="c1"># for the user to interact with the example</span>
+    <span class="n">client_loop</span><span class="p">()</span>
+
+<span class="k">def</span> <span class="nf">client_loop</span><span class="p">():</span>
+    <span class="k">global</span> <span class="n">server_link</span>
+
+    <span class="c1"># Wait for the link to become active</span>
+    <span class="k">while</span> <span class="ow">not</span> <span class="n">server_link</span><span class="p">:</span>
+        <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
+
+    <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">False</span>
+    <span class="k">while</span> <span class="ow">not</span> <span class="n">should_quit</span><span class="p">:</span>
+        <span class="k">try</span><span class="p">:</span>
+            <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&gt; &quot;</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s2">&quot; &quot;</span><span class="p">)</span>
+            <span class="n">text</span> <span class="o">=</span> <span class="nb">input</span><span class="p">()</span>
+
+            <span class="c1"># Check if we should quit the example</span>
+            <span class="k">if</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;quit&quot;</span> <span class="ow">or</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;q&quot;</span> <span class="ow">or</span> <span class="n">text</span> <span class="o">==</span> <span class="s2">&quot;exit&quot;</span><span class="p">:</span>
+                <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">True</span>
+                <span class="n">server_link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
+
+            <span class="k">else</span><span class="p">:</span>
+                <span class="n">server_link</span><span class="o">.</span><span class="n">request</span><span class="p">(</span>
+                    <span class="s2">&quot;/random/text&quot;</span><span class="p">,</span>
+                    <span class="n">data</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
+                    <span class="n">response_callback</span> <span class="o">=</span> <span class="n">got_response</span><span class="p">,</span>
+                    <span class="n">failed_callback</span> <span class="o">=</span> <span class="n">request_failed</span>
+                <span class="p">)</span>
+
+
+        <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+            <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Error while sending request over the link: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
+            <span class="n">should_quit</span> <span class="o">=</span> <span class="kc">True</span>
+            <span class="n">server_link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
+
+<span class="k">def</span> <span class="nf">got_response</span><span class="p">(</span><span class="n">request_receipt</span><span class="p">):</span>
+    <span class="n">request_id</span> <span class="o">=</span> <span class="n">request_receipt</span><span class="o">.</span><span class="n">request_id</span>
+    <span class="n">response</span> <span class="o">=</span> <span class="n">request_receipt</span><span class="o">.</span><span class="n">response</span>
+
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Got response for request &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">request_id</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot;: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">response</span><span class="p">))</span>
+
+<span class="k">def</span> <span class="nf">request_received</span><span class="p">(</span><span class="n">request_receipt</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The request &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">request_receipt</span><span class="o">.</span><span class="n">request_id</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; was received by the remote peer.&quot;</span><span class="p">)</span>
+
+<span class="k">def</span> <span class="nf">request_failed</span><span class="p">(</span><span class="n">request_receipt</span><span class="p">):</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The request &quot;</span><span class="o">+</span><span class="n">RNS</span><span class="o">.</span><span class="n">prettyhexrep</span><span class="p">(</span><span class="n">request_receipt</span><span class="o">.</span><span class="n">request_id</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; failed.&quot;</span><span class="p">)</span>
+
+
+<span class="c1"># This function is called when a link</span>
+<span class="c1"># has been established with the server</span>
+<span class="k">def</span> <span class="nf">link_established</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="c1"># We store a reference to the link</span>
+    <span class="c1"># instance for later use</span>
+    <span class="k">global</span> <span class="n">server_link</span>
+    <span class="n">server_link</span> <span class="o">=</span> <span class="n">link</span>
+
+    <span class="c1"># Inform the user that the server is</span>
+    <span class="c1"># connected</span>
+    <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Link established with server, hit enter to perform a request, or type in </span><span class="se">\&quot;</span><span class="s2">quit</span><span class="se">\&quot;</span><span class="s2"> to quit&quot;</span><span class="p">)</span>
+
+<span class="c1"># When a link is closed, we&#39;ll inform the</span>
+<span class="c1"># user, and exit the program</span>
+<span class="k">def</span> <span class="nf">link_closed</span><span class="p">(</span><span class="n">link</span><span class="p">):</span>
+    <span class="k">if</span> <span class="n">link</span><span class="o">.</span><span class="n">teardown_reason</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">TIMEOUT</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The link timed out, exiting now&quot;</span><span class="p">)</span>
+    <span class="k">elif</span> <span class="n">link</span><span class="o">.</span><span class="n">teardown_reason</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">DESTINATION_CLOSED</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;The link was closed by the server, exiting now&quot;</span><span class="p">)</span>
+    <span class="k">else</span><span class="p">:</span>
+        <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Link closed, exiting now&quot;</span><span class="p">)</span>
+    
+    <span class="n">RNS</span><span class="o">.</span><span class="n">Reticulum</span><span class="o">.</span><span class="n">exit_handler</span><span class="p">()</span>
+    <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">1.5</span><span class="p">)</span>
+    <span class="n">os</span><span class="o">.</span><span class="n">_exit</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
+
+
+<span class="c1">##########################################################</span>
+<span class="c1">#### Program Startup #####################################</span>
+<span class="c1">##########################################################</span>
+
+<span class="c1"># This part of the program runs at startup,</span>
+<span class="c1"># and parses input of from the user, and then</span>
+<span class="c1"># starts up the desired program mode.</span>
+<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
+    <span class="k">try</span><span class="p">:</span>
+        <span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">(</span><span class="n">description</span><span class="o">=</span><span class="s2">&quot;Simple request/response example&quot;</span><span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;-s&quot;</span><span class="p">,</span>
+            <span class="s2">&quot;--server&quot;</span><span class="p">,</span>
+            <span class="n">action</span><span class="o">=</span><span class="s2">&quot;store_true&quot;</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;wait for incoming requests from clients&quot;</span>
+        <span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;--config&quot;</span><span class="p">,</span>
+            <span class="n">action</span><span class="o">=</span><span class="s2">&quot;store&quot;</span><span class="p">,</span>
+            <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;path to alternative Reticulum config directory&quot;</span><span class="p">,</span>
+            <span class="nb">type</span><span class="o">=</span><span class="nb">str</span>
+        <span class="p">)</span>
+
+        <span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span>
+            <span class="s2">&quot;destination&quot;</span><span class="p">,</span>
+            <span class="n">nargs</span><span class="o">=</span><span class="s2">&quot;?&quot;</span><span class="p">,</span>
+            <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
+            <span class="n">help</span><span class="o">=</span><span class="s2">&quot;hexadecimal hash of the server destination&quot;</span><span class="p">,</span>
+            <span class="nb">type</span><span class="o">=</span><span class="nb">str</span>
+        <span class="p">)</span>
+
+        <span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
+
+        <span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">config</span><span class="p">:</span>
+            <span class="n">configarg</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">config</span>
+        <span class="k">else</span><span class="p">:</span>
+            <span class="n">configarg</span> <span class="o">=</span> <span class="kc">None</span>
+
+        <span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">server</span><span class="p">:</span>
+            <span class="n">server</span><span class="p">(</span><span class="n">configarg</span><span class="p">)</span>
+        <span class="k">else</span><span class="p">:</span>
+            <span class="k">if</span> <span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">destination</span> <span class="o">==</span> <span class="kc">None</span><span class="p">):</span>
+                <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+                <span class="n">parser</span><span class="o">.</span><span class="n">print_help</span><span class="p">()</span>
+                <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+            <span class="k">else</span><span class="p">:</span>
+                <span class="n">client</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">destination</span><span class="p">,</span> <span class="n">configarg</span><span class="p">)</span>
+
+    <span class="k">except</span> <span class="ne">KeyboardInterrupt</span><span class="p">:</span>
+        <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
+        <span class="n">exit</span><span class="p">()</span>
+</pre></div>
+</div>
+<p>This example can also be found at <a class="reference external" href="https://github.com/markqvist/Reticulum/blob/master/Examples/Request.py">https://github.com/markqvist/Reticulum/blob/master/Examples/Request.py</a>.</p>
+</div>
 <div class="section" id="filetransfer">
 <span id="example-filetransfer"></span><h2>Filetransfer<a class="headerlink" href="#filetransfer" title="Permalink to this headline">¶</a></h2>
 <p>The <em>Filetransfer</em> example implements a basic file-server program that
@@ -1110,7 +1724,7 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
 
     <span class="c1"># We configure a function that will get called every time</span>
     <span class="c1"># a new client creates a link to this destination.</span>
-    <span class="n">server_destination</span><span class="o">.</span><span class="n">link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
+    <span class="n">server_destination</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">client_connected</span><span class="p">)</span>
 
     <span class="c1"># Everything&#39;s ready!</span>
     <span class="c1"># Let&#39;s Wait for client requests or user input</span>
@@ -1147,7 +1761,7 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
     <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">serve_path</span><span class="p">):</span>
         <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client connected, sending file list...&quot;</span><span class="p">)</span>
 
-        <span class="n">link</span><span class="o">.</span><span class="n">link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
+        <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">client_disconnected</span><span class="p">)</span>
 
         <span class="c1"># We pack a list of files for sending in a packet</span>
         <span class="n">data</span> <span class="o">=</span> <span class="n">umsgpack</span><span class="o">.</span><span class="n">packb</span><span class="p">(</span><span class="n">list_files</span><span class="p">())</span>
@@ -1159,8 +1773,8 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
             <span class="n">list_packet</span> <span class="o">=</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Packet</span><span class="p">(</span><span class="n">link</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
             <span class="n">list_receipt</span> <span class="o">=</span> <span class="n">list_packet</span><span class="o">.</span><span class="n">send</span><span class="p">()</span>
             <span class="n">list_receipt</span><span class="o">.</span><span class="n">set_timeout</span><span class="p">(</span><span class="n">APP_TIMEOUT</span><span class="p">)</span>
-            <span class="n">list_receipt</span><span class="o">.</span><span class="n">delivery_callback</span><span class="p">(</span><span class="n">list_delivered</span><span class="p">)</span>
-            <span class="n">list_receipt</span><span class="o">.</span><span class="n">timeout_callback</span><span class="p">(</span><span class="n">list_timeout</span><span class="p">)</span>
+            <span class="n">list_receipt</span><span class="o">.</span><span class="n">set_delivery_callback</span><span class="p">(</span><span class="n">list_delivered</span><span class="p">)</span>
+            <span class="n">list_receipt</span><span class="o">.</span><span class="n">set_timeout_callback</span><span class="p">(</span><span class="n">list_timeout</span><span class="p">)</span>
         <span class="k">else</span><span class="p">:</span>
             <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Too many files in served directory!&quot;</span><span class="p">,</span> <span class="n">RNS</span><span class="o">.</span><span class="n">LOG_ERROR</span><span class="p">)</span>
             <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;You should implement a function to split the filelist over multiple packets.&quot;</span><span class="p">,</span> <span class="n">RNS</span><span class="o">.</span><span class="n">LOG_ERROR</span><span class="p">)</span>
@@ -1170,7 +1784,7 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
         <span class="c1"># open until the client requests a file. We&#39;ll</span>
         <span class="c1"># configure a function that get&#39;s called when</span>
         <span class="c1"># the client sends a packet with a file request.</span>
-        <span class="n">link</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">client_request</span><span class="p">)</span>
+        <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">client_request</span><span class="p">)</span>
     <span class="k">else</span><span class="p">:</span>
         <span class="n">RNS</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="s2">&quot;Client connected, but served path no longer exists!&quot;</span><span class="p">,</span> <span class="n">RNS</span><span class="o">.</span><span class="n">LOG_ERROR</span><span class="p">)</span>
         <span class="n">link</span><span class="o">.</span><span class="n">teardown</span><span class="p">()</span>
@@ -1180,7 +1794,12 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
 
 <span class="k">def</span> <span class="nf">client_request</span><span class="p">(</span><span class="n">message</span><span class="p">,</span> <span class="n">packet</span><span class="p">):</span>
     <span class="k">global</span> <span class="n">serve_path</span>
-    <span class="n">filename</span> <span class="o">=</span> <span class="n">message</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+
+    <span class="k">try</span><span class="p">:</span>
+        <span class="n">filename</span> <span class="o">=</span> <span class="n">message</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>
+    <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+        <span class="n">filename</span> <span class="o">=</span> <span class="kc">None</span>
+
     <span class="k">if</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">list_files</span><span class="p">():</span>
         <span class="k">try</span><span class="p">:</span>
             <span class="c1"># If we have the requested file, we&#39;ll</span>
@@ -1299,18 +1918,18 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
     <span class="c1"># We expect any normal data packets on the link</span>
     <span class="c1"># to contain a list of served files, so we set</span>
     <span class="c1"># a callback accordingly</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">packet_callback</span><span class="p">(</span><span class="n">filelist_received</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_packet_callback</span><span class="p">(</span><span class="n">filelist_received</span><span class="p">)</span>
 
     <span class="c1"># We&#39;ll also set up functions to inform the</span>
     <span class="c1"># user when the link is established or closed</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_established_callback</span><span class="p">(</span><span class="n">link_established</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_link_closed_callback</span><span class="p">(</span><span class="n">link_closed</span><span class="p">)</span>
 
     <span class="c1"># And set the link to automatically begin</span>
     <span class="c1"># downloading advertised resources</span>
     <span class="n">link</span><span class="o">.</span><span class="n">set_resource_strategy</span><span class="p">(</span><span class="n">RNS</span><span class="o">.</span><span class="n">Link</span><span class="o">.</span><span class="n">ACCEPT_ALL</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">resource_started_callback</span><span class="p">(</span><span class="n">download_began</span><span class="p">)</span>
-    <span class="n">link</span><span class="o">.</span><span class="n">resource_concluded_callback</span><span class="p">(</span><span class="n">download_concluded</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_resource_started_callback</span><span class="p">(</span><span class="n">download_began</span><span class="p">)</span>
+    <span class="n">link</span><span class="o">.</span><span class="n">set_resource_concluded_callback</span><span class="p">(</span><span class="n">download_concluded</span><span class="p">)</span>
 
     <span class="n">menu</span><span class="p">()</span>
 
@@ -1398,7 +2017,7 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
         <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="p">)</span>
         <span class="k">while</span> <span class="n">menu_mode</span> <span class="o">==</span> <span class="s2">&quot;downloading&quot;</span><span class="p">:</span>
             <span class="k">global</span> <span class="n">current_download</span>
-            <span class="n">percent</span> <span class="o">=</span> <span class="nb">round</span><span class="p">(</span><span class="n">current_download</span><span class="o">.</span><span class="n">progress</span><span class="p">()</span> <span class="o">*</span> <span class="mf">100.0</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+            <span class="n">percent</span> <span class="o">=</span> <span class="nb">round</span><span class="p">(</span><span class="n">current_download</span><span class="o">.</span><span class="n">get_progress</span><span class="p">()</span> <span class="o">*</span> <span class="mf">100.0</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
             <span class="nb">print</span><span class="p">((</span><span class="s2">&quot;</span><span class="se">\r</span><span class="s2">Progress: &quot;</span><span class="o">+</span><span class="nb">str</span><span class="p">(</span><span class="n">percent</span><span class="p">)</span><span class="o">+</span><span class="s2">&quot; %   &quot;</span><span class="p">),</span> <span class="n">end</span><span class="o">=</span><span class="s1">&#39; &#39;</span><span class="p">)</span>
             <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
             <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.1</span><span class="p">)</span>
@@ -1542,7 +2161,6 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
 
     <span class="n">saved_filename</span> <span class="o">=</span> <span class="n">current_filename</span>
 
-
     <span class="k">if</span> <span class="n">resource</span><span class="o">.</span><span class="n">status</span> <span class="o">==</span> <span class="n">RNS</span><span class="o">.</span><span class="n">Resource</span><span class="o">.</span><span class="n">COMPLETE</span><span class="p">:</span>
         <span class="n">counter</span> <span class="o">=</span> <span class="mi">0</span>
         <span class="k">while</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">saved_filename</span><span class="p">):</span>
@@ -1661,17 +2279,16 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
 <li><a class="reference internal" href="#broadcast">Broadcast</a></li>
 <li><a class="reference internal" href="#echo">Echo</a></li>
 <li><a class="reference internal" href="#link">Link</a></li>
+<li><a class="reference internal" href="#example-identify">Identification</a></li>
+<li><a class="reference internal" href="#requests-responses">Requests &amp; Responses</a></li>
 <li><a class="reference internal" href="#filetransfer">Filetransfer</a></li>
 </ul>
 </li>
 </ul>
 
   <h4>Previous topic</h4>
-  <p class="topless"><a href="gettingstartedfast.html"
-                        title="previous chapter">Getting Started Fast</a></p>
-  <h4>Next topic</h4>
   <p class="topless"><a href="reference.html"
-                        title="next chapter">API Reference</a></p>
+                        title="previous chapter">API Reference</a></p>
   <div role="note" aria-label="source link">
     <h3>This Page</h3>
     <ul class="this-page-menu">
@@ -1701,11 +2318,8 @@ interface to efficiently pass files of any size over a Reticulum <a class="refer
              >index</a></li>
         <li class="right" >
           <a href="reference.html" title="API Reference"
-             >next</a> |</li>
-        <li class="right" >
-          <a href="gettingstartedfast.html" title="Getting Started Fast"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Examples</a></li> 
       </ul>
     </div>

docs/manual/genindex.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Index &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Index &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -23,7 +23,7 @@
         <li class="right" style="margin-right: 10px">
           <a href="#" title="General Index"
              accesskey="I">index</a></li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Index</a></li> 
       </ul>
     </div>  
@@ -47,6 +47,7 @@
  | <a href="#I"><strong>I</strong></a>
  | <a href="#K"><strong>K</strong></a>
  | <a href="#L"><strong>L</strong></a>
+ | <a href="#M"><strong>M</strong></a>
  | <a href="#N"><strong>N</strong></a>
  | <a href="#P"><strong>P</strong></a>
  | <a href="#R"><strong>R</strong></a>
@@ -80,8 +81,12 @@
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Destination.create_keys">create_keys() (RNS.Destination method)</a>
 </li>
-      <li><a href="reference.html#RNS.Link.CURVE">CURVE (RNS.Link attribute)</a>
+      <li><a href="reference.html#RNS.Identity.CURVE">CURVE (RNS.Identity attribute)</a>
+
+      <ul>
+        <li><a href="reference.html#RNS.Link.CURVE">(RNS.Link attribute)</a>
 </li>
+      </ul></li>
   </ul></td>
 </tr></table>
 
@@ -94,17 +99,13 @@
         <li><a href="reference.html#RNS.Identity.decrypt">(RNS.Identity method)</a>
 </li>
       </ul></li>
-      <li><a href="reference.html#RNS.Link.DEFAULT_TIMEOUT">DEFAULT_TIMEOUT (RNS.Link attribute)</a>
-</li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="reference.html#RNS.PacketReceipt.delivery_callback">delivery_callback() (RNS.PacketReceipt method)</a>
-</li>
       <li><a href="reference.html#RNS.Transport.deregister_announce_handler">deregister_announce_handler() (RNS.Transport static method)</a>
 </li>
-      <li><a href="reference.html#RNS.Destination">Destination (class in RNS)</a>
+      <li><a href="reference.html#RNS.Destination.deregister_request_handler">deregister_request_handler() (RNS.Destination method)</a>
 </li>
-      <li><a href="reference.html#RNS.Link.disable_encryption">disable_encryption() (RNS.Link method)</a>
+      <li><a href="reference.html#RNS.Destination">Destination (class in RNS)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -119,11 +120,19 @@
 </li>
       </ul></li>
   </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Packet.ENCRYPTED_MDU">ENCRYPTED_MDU (RNS.Packet attribute)</a>
+</li>
+      <li><a href="reference.html#RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP">ESTABLISHMENT_TIMEOUT_PER_HOP (RNS.Link attribute)</a>
+</li>
+  </ul></td>
 </tr></table>
 
 <h2 id="F">F</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Identity.from_bytes">from_bytes() (RNS.Identity static method)</a>
+</li>
       <li><a href="reference.html#RNS.Identity.from_file">from_file() (RNS.Identity static method)</a>
 </li>
   </ul></td>
@@ -144,14 +153,34 @@
         <li><a href="reference.html#RNS.Identity.get_private_key">(RNS.Identity method)</a>
 </li>
       </ul></li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.RequestReceipt.get_progress">get_progress() (RNS.RequestReceipt method)</a>
+
+      <ul>
+        <li><a href="reference.html#RNS.Resource.get_progress">(RNS.Resource method)</a>
+</li>
+      </ul></li>
       <li><a href="reference.html#RNS.Identity.get_public_key">get_public_key() (RNS.Identity method)</a>
 </li>
       <li><a href="reference.html#RNS.Identity.get_random_hash">get_random_hash() (RNS.Identity static method)</a>
 </li>
-      <li><a href="reference.html#RNS.PacketReceipt.get_status">get_status() (RNS.PacketReceipt method)</a>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Link.get_remote_identity">get_remote_identity() (RNS.Link method)</a>
 </li>
+      <li><a href="reference.html#RNS.RequestReceipt.get_request_id">get_request_id() (RNS.RequestReceipt method)</a>
+</li>
+      <li><a href="reference.html#RNS.RequestReceipt.get_response">get_response() (RNS.RequestReceipt method)</a>
+</li>
+      <li><a href="reference.html#RNS.RequestReceipt.get_response_time">get_response_time() (RNS.RequestReceipt method)</a>
+</li>
+      <li><a href="reference.html#RNS.PacketReceipt.get_rtt">get_rtt() (RNS.PacketReceipt method)</a>
+</li>
+      <li><a href="reference.html#RNS.PacketReceipt.get_status">get_status() (RNS.PacketReceipt method)</a>
+
+      <ul>
+        <li><a href="reference.html#RNS.RequestReceipt.get_status">(RNS.RequestReceipt method)</a>
+</li>
+      </ul></li>
   </ul></td>
 </tr></table>
 
@@ -160,11 +189,13 @@
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Transport.has_path">has_path() (RNS.Transport static method)</a>
 </li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Destination.hash">hash() (RNS.Destination static method)</a>
 </li>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Destination.hash_from_name_and_identity">hash_from_name_and_identity() (RNS.Destination static method)</a>
+</li>
+      <li><a href="reference.html#RNS.Transport.hops_to">hops_to() (RNS.Transport static method)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -172,10 +203,12 @@
 <h2 id="I">I</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="reference.html#RNS.Identity">Identity (class in RNS)</a>
+      <li><a href="reference.html#RNS.Link.identify">identify() (RNS.Link method)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Identity">Identity (class in RNS)</a>
+</li>
       <li><a href="reference.html#RNS.Link.inactive_for">inactive_for() (RNS.Link method)</a>
 </li>
   </ul></td>
@@ -198,21 +231,27 @@
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Link">Link (class in RNS)</a>
 </li>
-      <li><a href="reference.html#RNS.Destination.link_established_callback">link_established_callback() (RNS.Destination method)</a>
-</li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Destination.load_private_key">load_private_key() (RNS.Destination method)</a>
 
       <ul>
         <li><a href="reference.html#RNS.Identity.load_private_key">(RNS.Identity method)</a>
 </li>
       </ul></li>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Identity.load_public_key">load_public_key() (RNS.Identity method)</a>
 </li>
   </ul></td>
 </tr></table>
 
+<h2 id="M">M</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Reticulum.MTU">MTU (RNS.Reticulum attribute)</a>
+</li>
+  </ul></td>
+</tr></table>
+
 <h2 id="N">N</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
@@ -230,19 +269,13 @@
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Packet">Packet (class in RNS)</a>
 </li>
-      <li><a href="reference.html#RNS.Destination.packet_callback">packet_callback() (RNS.Destination method)</a>
-
-      <ul>
-        <li><a href="reference.html#RNS.Link.packet_callback">(RNS.Link method)</a>
-</li>
-      </ul></li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.PacketReceipt">PacketReceipt (class in RNS)</a>
 </li>
-      <li><a href="reference.html#RNS.Resource.progress">progress() (RNS.Resource method)</a>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Transport.PATHFINDER_M">PATHFINDER_M (RNS.Transport attribute)</a>
 </li>
-      <li><a href="reference.html#RNS.Destination.proof_requested_callback">proof_requested_callback() (RNS.Destination method)</a>
+      <li><a href="reference.html#RNS.Packet.PLAIN_MDU">PLAIN_MDU (RNS.Packet attribute)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -256,23 +289,21 @@
 </li>
       <li><a href="reference.html#RNS.Transport.register_announce_handler">register_announce_handler() (RNS.Transport static method)</a>
 </li>
-      <li><a href="reference.html#RNS.Transport.request_path">request_path() (RNS.Transport static method)</a>
+      <li><a href="reference.html#RNS.Destination.register_request_handler">register_request_handler() (RNS.Destination method)</a>
 </li>
-      <li><a href="reference.html#RNS.Packet.resend">resend() (RNS.Packet method)</a>
+      <li><a href="reference.html#RNS.Link.request">request() (RNS.Link method)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Transport.request_path">request_path() (RNS.Transport static method)</a>
+</li>
+      <li><a href="reference.html#RNS.RequestReceipt">RequestReceipt (class in RNS)</a>
+</li>
+      <li><a href="reference.html#RNS.Packet.resend">resend() (RNS.Packet method)</a>
+</li>
       <li><a href="reference.html#RNS.Resource">Resource (class in RNS)</a>
-</li>
-      <li><a href="reference.html#RNS.Link.resource_callback">resource_callback() (RNS.Link method)</a>
-</li>
-      <li><a href="reference.html#RNS.Link.resource_concluded_callback">resource_concluded_callback() (RNS.Link method)</a>
-</li>
-      <li><a href="reference.html#RNS.Link.resource_started_callback">resource_started_callback() (RNS.Link method)</a>
 </li>
       <li><a href="reference.html#RNS.Reticulum">Reticulum (class in RNS)</a>
-</li>
-      <li><a href="reference.html#RNS.PacketReceipt.rtt">rtt() (RNS.PacketReceipt method)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -283,16 +314,36 @@
       <li><a href="reference.html#RNS.Packet.send">send() (RNS.Packet method)</a>
 </li>
       <li><a href="reference.html#RNS.Destination.set_default_app_data">set_default_app_data() (RNS.Destination method)</a>
+</li>
+      <li><a href="reference.html#RNS.PacketReceipt.set_delivery_callback">set_delivery_callback() (RNS.PacketReceipt method)</a>
+</li>
+      <li><a href="reference.html#RNS.Destination.set_link_established_callback">set_link_established_callback() (RNS.Destination method)</a>
+</li>
+      <li><a href="reference.html#RNS.Destination.set_packet_callback">set_packet_callback() (RNS.Destination method)</a>
+
+      <ul>
+        <li><a href="reference.html#RNS.Link.set_packet_callback">(RNS.Link method)</a>
+</li>
+      </ul></li>
+      <li><a href="reference.html#RNS.Destination.set_proof_requested_callback">set_proof_requested_callback() (RNS.Destination method)</a>
 </li>
       <li><a href="reference.html#RNS.Destination.set_proof_strategy">set_proof_strategy() (RNS.Destination method)</a>
 </li>
-      <li><a href="reference.html#RNS.Link.set_resource_strategy">set_resource_strategy() (RNS.Link method)</a>
+      <li><a href="reference.html#RNS.Link.set_remote_identified_callback">set_remote_identified_callback() (RNS.Link method)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="reference.html#RNS.Link.set_resource_callback">set_resource_callback() (RNS.Link method)</a>
+</li>
+      <li><a href="reference.html#RNS.Link.set_resource_concluded_callback">set_resource_concluded_callback() (RNS.Link method)</a>
+</li>
+      <li><a href="reference.html#RNS.Link.set_resource_started_callback">set_resource_started_callback() (RNS.Link method)</a>
+</li>
+      <li><a href="reference.html#RNS.Link.set_resource_strategy">set_resource_strategy() (RNS.Link method)</a>
+</li>
       <li><a href="reference.html#RNS.PacketReceipt.set_timeout">set_timeout() (RNS.PacketReceipt method)</a>
 </li>
-      <li><a href="reference.html#RNS.Reticulum.should_allow_unencrypted">should_allow_unencrypted() (RNS.Reticulum static method)</a>
+      <li><a href="reference.html#RNS.PacketReceipt.set_timeout_callback">set_timeout_callback() (RNS.PacketReceipt method)</a>
 </li>
       <li><a href="reference.html#RNS.Reticulum.should_use_implicit_proof">should_use_implicit_proof() (RNS.Reticulum static method)</a>
 </li>
@@ -309,15 +360,13 @@
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="reference.html#RNS.Link.teardown">teardown() (RNS.Link method)</a>
-</li>
-      <li><a href="reference.html#RNS.PacketReceipt.timeout_callback">timeout_callback() (RNS.PacketReceipt method)</a>
 </li>
       <li><a href="reference.html#RNS.Identity.to_file">to_file() (RNS.Identity method)</a>
+</li>
+      <li><a href="reference.html#RNS.Transport">Transport (class in RNS)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="reference.html#RNS.Transport">Transport (class in RNS)</a>
-</li>
       <li><a href="reference.html#RNS.Reticulum.transport_enabled">transport_enabled() (RNS.Reticulum static method)</a>
 </li>
       <li><a href="reference.html#RNS.Identity.truncated_hash">truncated_hash() (RNS.Identity static method)</a>
@@ -363,7 +412,7 @@
         <li class="right" style="margin-right: 10px">
           <a href="#" title="General Index"
              >index</a></li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Index</a></li> 
       </ul>
     </div>

docs/manual/gettingstartedfast.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Getting Started Fast &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Getting Started Fast &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -16,7 +16,7 @@
     
     <link rel="index" title="Index" href="genindex.html" />
     <link rel="search" title="Search" href="search.html" />
-    <link rel="next" title="Examples" href="examples.html" />
+    <link rel="next" title="Understanding Reticulum" href="understanding.html" />
     <link rel="prev" title="What is Reticulum?" href="whatis.html" /> 
   </head><body>
     <div class="related" role="navigation" aria-label="related navigation">
@@ -26,12 +26,12 @@
           <a href="genindex.html" title="General Index"
              accesskey="I">index</a></li>
         <li class="right" >
-          <a href="examples.html" title="Examples"
+          <a href="understanding.html" title="Understanding Reticulum"
              accesskey="N">next</a> |</li>
         <li class="right" >
           <a href="whatis.html" title="What is Reticulum?"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Getting Started Fast</a></li> 
       </ul>
     </div>  
@@ -43,7 +43,6 @@
             
   <div class="section" id="getting-started-fast">
 <h1>Getting Started Fast<a class="headerlink" href="#getting-started-fast" title="Permalink to this headline">¶</a></h1>
-<p>What do we want to do? Something! When do we want to do it? Right now! Let’s go.</p>
 <p>The best way to get started with the Reticulum Network Stack depends on what
 you want to do. This guide will outline sensible starting paths for different
 scenarios.</p>
@@ -60,7 +59,7 @@ in the development for the messaging and information-sharing protocol
 <div class="section" id="develop-a-program-with-reticulum">
 <h2>Develop a Program with Reticulum<a class="headerlink" href="#develop-a-program-with-reticulum" title="Permalink to this headline">¶</a></h2>
 <p>If you want to develop programs that use Reticulum, the easiest way to get
-started is to install Reticulum via pip:</p>
+started is to install the latest release of Reticulum via pip:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pip3</span> <span class="n">install</span> <span class="n">rns</span>
 </pre></div>
 </div>
@@ -132,8 +131,8 @@ don’t use pip, but try this recipe:</p>
   <p class="topless"><a href="whatis.html"
                         title="previous chapter">What is Reticulum?</a></p>
   <h4>Next topic</h4>
-  <p class="topless"><a href="examples.html"
-                        title="next chapter">Examples</a></p>
+  <p class="topless"><a href="understanding.html"
+                        title="next chapter">Understanding Reticulum</a></p>
   <div role="note" aria-label="source link">
     <h3>This Page</h3>
     <ul class="this-page-menu">
@@ -162,12 +161,12 @@ don’t use pip, but try this recipe:</p>
           <a href="genindex.html" title="General Index"
              >index</a></li>
         <li class="right" >
-          <a href="examples.html" title="Examples"
+          <a href="understanding.html" title="Understanding Reticulum"
              >next</a> |</li>
         <li class="right" >
           <a href="whatis.html" title="What is Reticulum?"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Getting Started Fast</a></li> 
       </ul>
     </div>

docs/manual/index.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Reticulum Network Stack Manual &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Reticulum Network Stack Manual &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -27,7 +27,7 @@
         <li class="right" >
           <a href="whatis.html" title="What is Reticulum?"
              accesskey="N">next</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="#">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Reticulum Network Stack Manual</a></li> 
       </ul>
     </div>  
@@ -58,29 +58,6 @@ the development of Reticulum itself.</p>
 <li class="toctree-l2"><a class="reference internal" href="gettingstartedfast.html#participate-in-reticulum-development">Participate in Reticulum Development</a></li>
 </ul>
 </li>
-<li class="toctree-l1"><a class="reference internal" href="examples.html">Examples</a><ul>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#minimal">Minimal</a></li>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#announce">Announce</a></li>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#broadcast">Broadcast</a></li>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#echo">Echo</a></li>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#link">Link</a></li>
-<li class="toctree-l2"><a class="reference internal" href="examples.html#filetransfer">Filetransfer</a></li>
-</ul>
-</li>
-<li class="toctree-l1"><a class="reference internal" href="reference.html">API Reference</a><ul>
-<li class="toctree-l2"><a class="reference internal" href="reference.html#classes">Classes</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#reticulum">Reticulum</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#api-identity">Identity</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#destination">Destination</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#packet">Packet</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#packet-receipt">Packet Receipt</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#link">Link</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#resource">Resource</a></li>
-<li class="toctree-l3"><a class="reference internal" href="reference.html#transport">Transport</a></li>
-</ul>
-</li>
-</ul>
-</li>
 <li class="toctree-l1"><a class="reference internal" href="understanding.html">Understanding Reticulum</a><ul>
 <li class="toctree-l2"><a class="reference internal" href="understanding.html#motivation">Motivation</a></li>
 <li class="toctree-l2"><a class="reference internal" href="understanding.html#goals">Goals</a></li>
@@ -92,6 +69,7 @@ the development of Reticulum itself.</p>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="understanding.html#reticulum-transport">Reticulum Transport</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="understanding.html#the-announce-mechanism-in-detail">The Announce Mechanism in Detail</a></li>
 <li class="toctree-l3"><a class="reference internal" href="understanding.html#reaching-the-destination">Reaching the Destination</a></li>
 <li class="toctree-l3"><a class="reference internal" href="understanding.html#resources">Resources</a></li>
 </ul>
@@ -105,6 +83,32 @@ the development of Reticulum itself.</p>
 </li>
 </ul>
 </li>
+<li class="toctree-l1"><a class="reference internal" href="reference.html">API Reference</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="reference.html#classes">Classes</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#reticulum">Reticulum</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#api-identity">Identity</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#destination">Destination</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#packet">Packet</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#packet-receipt">Packet Receipt</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#link">Link</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#request-receipt">Request Receipt</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#resource">Resource</a></li>
+<li class="toctree-l3"><a class="reference internal" href="reference.html#transport">Transport</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="examples.html">Examples</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#minimal">Minimal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#announce">Announce</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#broadcast">Broadcast</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#echo">Echo</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#link">Link</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#example-identify">Identification</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#requests-responses">Requests &amp; Responses</a></li>
+<li class="toctree-l2"><a class="reference internal" href="examples.html#filetransfer">Filetransfer</a></li>
+</ul>
+</li>
 </ul>
 </div>
 <div class="section" id="indices-and-tables">
@@ -164,7 +168,7 @@ the development of Reticulum itself.</p>
         <li class="right" >
           <a href="whatis.html" title="What is Reticulum?"
              >next</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="#">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Reticulum Network Stack Manual</a></li> 
       </ul>
     </div>

docs/manual/reference.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>API Reference &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>API Reference &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -16,8 +16,8 @@
     
     <link rel="index" title="Index" href="genindex.html" />
     <link rel="search" title="Search" href="search.html" />
-    <link rel="next" title="Understanding Reticulum" href="understanding.html" />
-    <link rel="prev" title="Examples" href="examples.html" /> 
+    <link rel="next" title="Examples" href="examples.html" />
+    <link rel="prev" title="Understanding Reticulum" href="understanding.html" /> 
   </head><body>
     <div class="related" role="navigation" aria-label="related navigation">
       <h3>Navigation</h3>
@@ -26,12 +26,12 @@
           <a href="genindex.html" title="General Index"
              accesskey="I">index</a></li>
         <li class="right" >
-          <a href="understanding.html" title="Understanding Reticulum"
+          <a href="examples.html" title="Examples"
              accesskey="N">next</a> |</li>
         <li class="right" >
-          <a href="examples.html" title="Examples"
+          <a href="understanding.html" title="Understanding Reticulum"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">API Reference</a></li> 
       </ul>
     </div>  
@@ -72,16 +72,16 @@ terminated (unless killed forcibly).</p>
 programs that use RNS starting and terminating at different times,
 it will be advantageous to run a master RNS instance as a daemon for
 other programs to use on demand.</p>
-<dl class="py method">
-<dt class="sig sig-object py" id="RNS.Reticulum.should_allow_unencrypted">
-<em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">should_allow_unencrypted</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Reticulum.should_allow_unencrypted" title="Permalink to this definition">¶</a></dt>
-<dd><p>Returns whether unencrypted links are allowed by the
-current configuration.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Returns</dt>
-<dd class="field-odd"><p>True if the current running configuration allows downgrading links to plaintext. False if not.</p>
-</dd>
-</dl>
+<dl class="py attribute">
+<dt class="sig sig-object py" id="RNS.Reticulum.MTU">
+<span class="sig-name descname"><span class="pre">MTU</span></span><em class="property"> <span class="pre">=</span> <span class="pre">500</span></em><a class="headerlink" href="#RNS.Reticulum.MTU" title="Permalink to this definition">¶</a></dt>
+<dd><p>The MTU that Reticulum adheres to, and will expect other peers to
+adhere to. By default, the MTU is 500 bytes. In custom RNS network
+implementations, it is possible to change this value, but doing so will
+completely break compatibility with all other RNS networks. An identical
+MTU is a prerequisite for peers to communicate in the same network.</p>
+<p>Unless you really know what you are doing, the MTU should be left at
+the default value.</p>
 </dd></dl>
 
 <dl class="py method">
@@ -117,26 +117,32 @@ and pass announces over the network.</p>
 <span id="identity"></span><h3>Identity<a class="headerlink" href="#api-identity" title="Permalink to this headline">¶</a></h3>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.Identity">
-<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Identity</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">public_only</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity" title="Permalink to this definition">¶</a></dt>
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Identity</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">create_keys</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity" title="Permalink to this definition">¶</a></dt>
 <dd><p>This class is used to manage identities in Reticulum. It provides methods
 for encryption, decryption, signatures and verification, and is the basis
 for all encrypted communication over Reticulum networks.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
-<dd class="field-odd"><p><strong>public_only</strong> – Specifies whether this destination only holds a public key.</p>
+<dd class="field-odd"><p><strong>create_keys</strong> – Specifies whether new encryption and signing keys should be generated.</p>
 </dd>
 </dl>
+<dl class="py attribute">
+<dt class="sig sig-object py" id="RNS.Identity.CURVE">
+<span class="sig-name descname"><span class="pre">CURVE</span></span><em class="property"> <span class="pre">=</span> <span class="pre">'Curve25519'</span></em><a class="headerlink" href="#RNS.Identity.CURVE" title="Permalink to this definition">¶</a></dt>
+<dd><p>The curve used for Elliptic Curve DH key exchanges</p>
+</dd></dl>
+
 <dl class="py attribute">
 <dt class="sig sig-object py" id="RNS.Identity.KEYSIZE">
-<span class="sig-name descname"><span class="pre">KEYSIZE</span></span><em class="property"> <span class="pre">=</span> <span class="pre">1024</span></em><a class="headerlink" href="#RNS.Identity.KEYSIZE" title="Permalink to this definition">¶</a></dt>
-<dd><p>RSA key size in bits.</p>
+<span class="sig-name descname"><span class="pre">KEYSIZE</span></span><em class="property"> <span class="pre">=</span> <span class="pre">512</span></em><a class="headerlink" href="#RNS.Identity.KEYSIZE" title="Permalink to this definition">¶</a></dt>
+<dd><p>X25519 key size in bits. A complete key is the concatenation of a 256 bit encryption key, and a 256 bit signing key.</p>
 </dd></dl>
 
 <dl class="py attribute">
 <dt class="sig sig-object py" id="RNS.Identity.TRUNCATED_HASHLENGTH">
 <span class="sig-name descname"><span class="pre">TRUNCATED_HASHLENGTH</span></span><em class="property"> <span class="pre">=</span> <span class="pre">80</span></em><a class="headerlink" href="#RNS.Identity.TRUNCATED_HASHLENGTH" title="Permalink to this definition">¶</a></dt>
 <dd><p>Constant specifying the truncated hash length (in bits) used by Reticulum
-for addressable hashes. Non-configurable.</p>
+for addressable hashes and other purposes. Non-configurable.</p>
 </dd></dl>
 
 <dl class="py method">
@@ -209,6 +215,21 @@ for addressable hashes. Non-configurable.</p>
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Identity.from_bytes">
+<em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">from_bytes</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">prv_bytes</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.from_bytes" title="Permalink to this definition">¶</a></dt>
+<dd><p>Create a new <a class="reference internal" href="#api-identity"><span class="std std-ref">RNS.Identity</span></a> instance from <em>bytes</em> of private key.
+Can be used to load previously created and saved identities into Reticulum.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>prv_bytes</strong> – The <em>bytes</em> of private a saved private key. <strong>HAZARD!</strong> Never use this to generate a new key by feeding random data in prv_bytes.</p>
+</dd>
+<dt class="field-even">Returns</dt>
+<dd class="field-even"><p>A <a class="reference internal" href="#api-identity"><span class="std std-ref">RNS.Identity</span></a> instance, or <em>None</em> if the <em>bytes</em> data was invalid.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Identity.from_file">
 <em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">from_file</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.from_file" title="Permalink to this definition">¶</a></dt>
@@ -224,6 +245,22 @@ Can be used to load previously created and saved identities into Reticulum.</p>
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Identity.to_file">
+<span class="sig-name descname"><span class="pre">to_file</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.to_file" title="Permalink to this definition">¶</a></dt>
+<dd><p>Saves the identity to a file. This will write the private key to disk,
+and anyone with access to this file will be able to decrypt all
+communication for the identity. Be very careful with this method.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>path</strong> – The full path specifying where to save the identity.</p>
+</dd>
+<dt class="field-even">Returns</dt>
+<dd class="field-even"><p>True if the file was saved, otherwise False.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Identity.get_private_key">
 <span class="sig-name descname"><span class="pre">get_private_key</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.get_private_key" title="Permalink to this definition">¶</a></dt>
@@ -260,11 +297,11 @@ Can be used to load previously created and saved identities into Reticulum.</p>
 
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Identity.load_public_key">
-<span class="sig-name descname"><span class="pre">load_public_key</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">key</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.load_public_key" title="Permalink to this definition">¶</a></dt>
+<span class="sig-name descname"><span class="pre">load_public_key</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pub_bytes</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.load_public_key" title="Permalink to this definition">¶</a></dt>
 <dd><p>Load a public key into the instance.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
-<dd class="field-odd"><p><strong>prv_bytes</strong> – The public key as <em>bytes</em>.</p>
+<dd class="field-odd"><p><strong>pub_bytes</strong> – The public key as <em>bytes</em>.</p>
 </dd>
 <dt class="field-even">Returns</dt>
 <dd class="field-even"><p>True if the key was loaded, otherwise False.</p>
@@ -272,22 +309,6 @@ Can be used to load previously created and saved identities into Reticulum.</p>
 </dl>
 </dd></dl>
 
-<dl class="py method">
-<dt class="sig sig-object py" id="RNS.Identity.to_file">
-<span class="sig-name descname"><span class="pre">to_file</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.to_file" title="Permalink to this definition">¶</a></dt>
-<dd><p>Saves the identity to a file. This will write the private key to disk,
-and anyone with access to this file will be able to decrypt all
-communication for the identity. Be very careful with this method.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Parameters</dt>
-<dd class="field-odd"><p><strong>path</strong> – The full path specifying where to save the identity.</p>
-</dd>
-<dt class="field-even">Returns</dt>
-<dd class="field-even"><p>True if the file was saved, otherwise False.</p>
-</dd>
-</dl>
-</dd></dl>
-
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Identity.encrypt">
 <span class="sig-name descname"><span class="pre">encrypt</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">plaintext</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.encrypt" title="Permalink to this definition">¶</a></dt>
@@ -297,17 +318,17 @@ communication for the identity. Be very careful with this method.</p>
 <dd class="field-odd"><p><strong>plaintext</strong> – The plaintext to be encrypted as <em>bytes</em>.</p>
 </dd>
 <dt class="field-even">Returns</dt>
-<dd class="field-even"><p>Ciphertext as <em>bytes</em>.</p>
+<dd class="field-even"><p>Ciphertext token as <em>bytes</em>.</p>
 </dd>
 <dt class="field-odd">Raises</dt>
-<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a public key</p>
+<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a public key.</p>
 </dd>
 </dl>
 </dd></dl>
 
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Identity.decrypt">
-<span class="sig-name descname"><span class="pre">decrypt</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">ciphertext</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.decrypt" title="Permalink to this definition">¶</a></dt>
+<span class="sig-name descname"><span class="pre">decrypt</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">ciphertext_token</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Identity.decrypt" title="Permalink to this definition">¶</a></dt>
 <dd><p>Decrypts information for the identity.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
@@ -317,7 +338,7 @@ communication for the identity. Be very careful with this method.</p>
 <dd class="field-even"><p>Plaintext as <em>bytes</em>, or <em>None</em> if decryption fails.</p>
 </dd>
 <dt class="field-odd">Raises</dt>
-<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a private key</p>
+<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a private key.</p>
 </dd>
 </dl>
 </dd></dl>
@@ -334,7 +355,7 @@ communication for the identity. Be very careful with this method.</p>
 <dd class="field-even"><p>Signature as <em>bytes</em>.</p>
 </dd>
 <dt class="field-odd">Raises</dt>
-<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a private key</p>
+<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a private key.</p>
 </dd>
 </dl>
 </dd></dl>
@@ -354,7 +375,7 @@ communication for the identity. Be very careful with this method.</p>
 <dd class="field-even"><p>True if the signature is valid, otherwise False.</p>
 </dd>
 <dt class="field-odd">Raises</dt>
-<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a public key</p>
+<dd class="field-odd"><p><em>KeyError</em> if the instance does not hold a public key.</p>
 </dd>
 </dl>
 </dd></dl>
@@ -377,7 +398,7 @@ encrypted communication with it.</p>
 <dt class="field-odd">Parameters</dt>
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>identity</strong> – An instance of <a class="reference internal" href="#api-identity"><span class="std std-ref">RNS.Identity</span></a>. Can hold only public keys for an outgoing destination, or holding private keys for an ingoing.</p></li>
-<li><p><strong>direction</strong> – <code class="docutils literal notranslate"><span class="pre">RNS.Destination.IN</span></code> or <code class="docutils literal notranslate"><span class="pre">RNS.Destination.OUT</span></code></p></li>
+<li><p><strong>direction</strong> – <code class="docutils literal notranslate"><span class="pre">RNS.Destination.IN</span></code> or <code class="docutils literal notranslate"><span class="pre">RNS.Destination.OUT</span></code>.</p></li>
 <li><p><strong>type</strong> – <code class="docutils literal notranslate"><span class="pre">RNS.Destination.SINGLE</span></code>, <code class="docutils literal notranslate"><span class="pre">RNS.Destination.GROUP</span></code> or <code class="docutils literal notranslate"><span class="pre">RNS.Destination.PLAIN</span></code>.</p></li>
 <li><p><strong>app_name</strong> – A string specifying the app name.</p></li>
 <li><p><strong>*aspects</strong> – Any non-zero number of string arguments.</p></li>
@@ -427,8 +448,8 @@ encrypted communication with it.</p>
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Destination.announce">
 <span class="sig-name descname"><span class="pre">announce</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">app_data</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">path_response</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.announce" title="Permalink to this definition">¶</a></dt>
-<dd><p>Creates an announce packet for this destination and broadcasts it on
-all interfaces. Application specific data can be added to the announce.</p>
+<dd><p>Creates an announce packet for this destination and broadcasts it on all
+relevant interfaces. Application specific data can be added to the announce.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
 <dd class="field-odd"><ul class="simple">
@@ -440,8 +461,8 @@ all interfaces. Application specific data can be added to the announce.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Destination.link_established_callback">
-<span class="sig-name descname"><span class="pre">link_established_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.link_established_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Destination.set_link_established_callback">
+<span class="sig-name descname"><span class="pre">set_link_established_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.set_link_established_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a link has been established to
 this destination.</p>
 <dl class="field-list simple">
@@ -452,8 +473,8 @@ this destination.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Destination.packet_callback">
-<span class="sig-name descname"><span class="pre">packet_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.packet_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Destination.set_packet_callback">
+<span class="sig-name descname"><span class="pre">set_packet_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.set_packet_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a packet has been received by
 this destination.</p>
 <dl class="field-list simple">
@@ -464,8 +485,8 @@ this destination.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Destination.proof_requested_callback">
-<span class="sig-name descname"><span class="pre">proof_requested_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.proof_requested_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Destination.set_proof_requested_callback">
+<span class="sig-name descname"><span class="pre">set_proof_requested_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.set_proof_requested_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a proof has been requested for
 a packet sent to this destination. Allows control over when and if
 proofs should be returned for received packets.</p>
@@ -487,6 +508,39 @@ proofs should be returned for received packets.</p>
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Destination.register_request_handler">
+<span class="sig-name descname"><span class="pre">register_request_handler</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">response_generator</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">allow</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">allowed_list</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.register_request_handler" title="Permalink to this definition">¶</a></dt>
+<dd><p>Registers a request handler.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><ul class="simple">
+<li><p><strong>path</strong> – The path for the request handler to be registered.</p></li>
+<li><p><strong>response_generator</strong> – A function or method with the signature <em>response_generator(path, data, request_id, remote_identity, requested_at)</em> to be called. Whatever this funcion returns will be sent as a response to the requester. If the function returns <code class="docutils literal notranslate"><span class="pre">None</span></code>, no response will be sent.</p></li>
+<li><p><strong>allow</strong> – One of <code class="docutils literal notranslate"><span class="pre">RNS.Destination.ALLOW_NONE</span></code>, <code class="docutils literal notranslate"><span class="pre">RNS.Destination.ALLOW_ALL</span></code> or <code class="docutils literal notranslate"><span class="pre">RNS.Destination.ALLOW_LIST</span></code>. If <code class="docutils literal notranslate"><span class="pre">RNS.Destination.ALLOW_LIST</span></code> is set, the request handler will only respond to requests for identified peers in the supplied list.</p></li>
+<li><p><strong>allowed_list</strong> – A list of <em>bytes-like</em> <a class="reference internal" href="#api-identity"><span class="std std-ref">RNS.Identity</span></a> hashes.</p></li>
+</ul>
+</dd>
+<dt class="field-even">Raises</dt>
+<dd class="field-even"><p><code class="docutils literal notranslate"><span class="pre">ValueError</span></code> if any of the supplied arguments are invalid.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Destination.deregister_request_handler">
+<span class="sig-name descname"><span class="pre">deregister_request_handler</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.deregister_request_handler" title="Permalink to this definition">¶</a></dt>
+<dd><p>Deregisters a request handler.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>path</strong> – The path for the request handler to be deregistered.</p>
+</dd>
+<dt class="field-even">Returns</dt>
+<dd class="field-even"><p>True if the handler was deregistered, otherwise False.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Destination.create_keys">
 <span class="sig-name descname"><span class="pre">create_keys</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Destination.create_keys" title="Permalink to this definition">¶</a></dt>
@@ -591,23 +645,36 @@ unless other app_data is specified in the <em>announce</em> method.</p>
 <span id="api-packet"></span><h3>Packet<a class="headerlink" href="#packet" title="Permalink to this headline">¶</a></h3>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.Packet">
-<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Packet</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">packet_type</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">context</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">transport_type</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">header_type</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">transport_id</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">attached_interface</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">create_receipt</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Packet" title="Permalink to this definition">¶</a></dt>
-<dd><p>The Packet class is used to create packet instances that can be
-sent over a Reticulum network.</p>
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Packet</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">create_receipt</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Packet" title="Permalink to this definition">¶</a></dt>
+<dd><p>The Packet class is used to create packet instances that can be sent
+over a Reticulum network. Packets to will automatically be encrypted if
+they are adressed to a <code class="docutils literal notranslate"><span class="pre">RNS.Destination.SINGLE</span></code> destination,
+<code class="docutils literal notranslate"><span class="pre">RNS.Destination.GROUP</span></code> destination or a <a class="reference internal" href="#api-link"><span class="std std-ref">RNS.Link</span></a>.</p>
+<p>For <code class="docutils literal notranslate"><span class="pre">RNS.Destination.GROUP</span></code> destinations, Reticulum will use the
+pre-shared key configured for the destination.</p>
+<p>For <code class="docutils literal notranslate"><span class="pre">RNS.Destination.SINGLE</span></code> destinations and <a class="reference internal" href="#api-link"><span class="std std-ref">RNS.Link</span></a>
+destinations, reticulum will use ephemeral keys, and offers <strong>Forward Secrecy</strong>.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>destination</strong> – A <a class="reference internal" href="#api-destination"><span class="std std-ref">RNS.Destination</span></a> instance to which the packet will be sent.</p></li>
 <li><p><strong>data</strong> – The data payload to be included in the packet as <em>bytes</em>.</p></li>
 <li><p><strong>create_receipt</strong> – Specifies whether a <a class="reference internal" href="#api-packetreceipt"><span class="std std-ref">RNS.PacketReceipt</span></a> should be created when instantiating the packet.</p></li>
-<li><p><strong>type</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>. Defaults to <code class="docutils literal notranslate"><span class="pre">RNS.Packet.DATA</span></code>, and should not be specified.</p></li>
-<li><p><strong>context</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>. Ignore.</p></li>
-<li><p><strong>transport_type</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>. Ignore.</p></li>
-<li><p><strong>transport_id</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>. Ignore.</p></li>
-<li><p><strong>attached_interface</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>. Ignore.</p></li>
 </ul>
 </dd>
 </dl>
+<dl class="py attribute">
+<dt class="sig sig-object py" id="RNS.Packet.ENCRYPTED_MDU">
+<span class="sig-name descname"><span class="pre">ENCRYPTED_MDU</span></span><em class="property"> <span class="pre">=</span> <span class="pre">383</span></em><a class="headerlink" href="#RNS.Packet.ENCRYPTED_MDU" title="Permalink to this definition">¶</a></dt>
+<dd><p>The maximum size of the payload data in a single encrypted packet</p>
+</dd></dl>
+
+<dl class="py attribute">
+<dt class="sig sig-object py" id="RNS.Packet.PLAIN_MDU">
+<span class="sig-name descname"><span class="pre">PLAIN_MDU</span></span><em class="property"> <span class="pre">=</span> <span class="pre">477</span></em><a class="headerlink" href="#RNS.Packet.PLAIN_MDU" title="Permalink to this definition">¶</a></dt>
+<dd><p>The maximum size of the payload data in a single unencrypted packet</p>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Packet.send">
 <span class="sig-name descname"><span class="pre">send</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Packet.send" title="Permalink to this definition">¶</a></dt>
@@ -637,11 +704,11 @@ sent over a Reticulum network.</p>
 <span id="api-packetreceipt"></span><h3>Packet Receipt<a class="headerlink" href="#packet-receipt" title="Permalink to this headline">¶</a></h3>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.PacketReceipt">
-<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">PacketReceipt</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">packet</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt" title="Permalink to this definition">¶</a></dt>
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">PacketReceipt</span></span><a class="headerlink" href="#RNS.PacketReceipt" title="Permalink to this definition">¶</a></dt>
 <dd><p>The PacketReceipt class is used to receive notifications about
 <a class="reference internal" href="#api-packet"><span class="std std-ref">RNS.Packet</span></a> instances sent over the network. Instances
-of this class should never be created manually, but always returned
-from a the <em>send()</em> method of a <a class="reference internal" href="#api-packet"><span class="std std-ref">RNS.Packet</span></a> instance.</p>
+of this class are never created manually, but always returned from
+the <em>send()</em> method of a <a class="reference internal" href="#api-packet"><span class="std std-ref">RNS.Packet</span></a> instance.</p>
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.PacketReceipt.get_status">
 <span class="sig-name descname"><span class="pre">get_status</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.get_status" title="Permalink to this definition">¶</a></dt>
@@ -653,8 +720,8 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.PacketReceipt.rtt">
-<span class="sig-name descname"><span class="pre">rtt</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.rtt" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.PacketReceipt.get_rtt">
+<span class="sig-name descname"><span class="pre">get_rtt</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.get_rtt" title="Permalink to this definition">¶</a></dt>
 <dd><dl class="field-list simple">
 <dt class="field-odd">Returns</dt>
 <dd class="field-odd"><p>The round-trip-time in seconds</p>
@@ -674,8 +741,8 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.PacketReceipt.delivery_callback">
-<span class="sig-name descname"><span class="pre">delivery_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.delivery_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.PacketReceipt.set_delivery_callback">
+<span class="sig-name descname"><span class="pre">set_delivery_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.set_delivery_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Sets a function that gets called if a successfull delivery has been proven.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
@@ -685,8 +752,8 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.PacketReceipt.timeout_callback">
-<span class="sig-name descname"><span class="pre">timeout_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.timeout_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.PacketReceipt.set_timeout_callback">
+<span class="sig-name descname"><span class="pre">set_timeout_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.PacketReceipt.set_timeout_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Sets a function that gets called if the delivery times out.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
@@ -702,15 +769,16 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 <span id="api-link"></span><h3>Link<a class="headerlink" href="#link" title="Permalink to this headline">¶</a></h3>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.Link">
-<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Link</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">owner</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">peer_pub_bytes</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">peer_sig_pub_bytes</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link" title="Permalink to this definition">¶</a></dt>
-<dd><p>This class.</p>
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Link</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">established_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">closed_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link" title="Permalink to this definition">¶</a></dt>
+<dd><p>This class is used to establish and manage links to other peers. When a
+link instance is created, Reticulum will attempt to establish verified
+connectivity with the specified destination.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>destination</strong> – A <a class="reference internal" href="#api-destination"><span class="std std-ref">RNS.Destination</span></a> instance which to establish a link to.</p></li>
-<li><p><strong>owner</strong> – Internal use by <a class="reference internal" href="#api-transport"><span class="std std-ref">RNS.Transport</span></a>, ignore this argument.</p></li>
-<li><p><strong>peer_pub_bytes</strong> – Internal use, ignore this argument.</p></li>
-<li><p><strong>peer_sig_pub_bytes</strong> – Internal use, ignore this argument.</p></li>
+<li><p><strong>established_callback</strong> – An optional function or method with the signature <em>callback(link)</em> to be called when the link has been established.</p></li>
+<li><p><strong>closed_callback</strong> – An optional function or method with the signature <em>callback(link)</em> to be called when the link is closed.</p></li>
 </ul>
 </dd>
 </dl>
@@ -721,17 +789,51 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 </dd></dl>
 
 <dl class="py attribute">
-<dt class="sig sig-object py" id="RNS.Link.DEFAULT_TIMEOUT">
-<span class="sig-name descname"><span class="pre">DEFAULT_TIMEOUT</span></span><em class="property"> <span class="pre">=</span> <span class="pre">15.0</span></em><a class="headerlink" href="#RNS.Link.DEFAULT_TIMEOUT" title="Permalink to this definition">¶</a></dt>
-<dd><p>Default timeout for link establishment in seconds.</p>
+<dt class="sig sig-object py" id="RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP">
+<span class="sig-name descname"><span class="pre">ESTABLISHMENT_TIMEOUT_PER_HOP</span></span><em class="property"> <span class="pre">=</span> <span class="pre">5</span></em><a class="headerlink" href="#RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP" title="Permalink to this definition">¶</a></dt>
+<dd><p>Default timeout for link establishment in seconds per hop to destination.</p>
 </dd></dl>
 
 <dl class="py attribute">
 <dt class="sig sig-object py" id="RNS.Link.KEEPALIVE">
-<span class="sig-name descname"><span class="pre">KEEPALIVE</span></span><em class="property"> <span class="pre">=</span> <span class="pre">180</span></em><a class="headerlink" href="#RNS.Link.KEEPALIVE" title="Permalink to this definition">¶</a></dt>
+<span class="sig-name descname"><span class="pre">KEEPALIVE</span></span><em class="property"> <span class="pre">=</span> <span class="pre">360</span></em><a class="headerlink" href="#RNS.Link.KEEPALIVE" title="Permalink to this definition">¶</a></dt>
 <dd><p>Interval for sending keep-alive packets on established links in seconds.</p>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Link.identify">
+<span class="sig-name descname"><span class="pre">identify</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">identity</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.identify" title="Permalink to this definition">¶</a></dt>
+<dd><p>Identifies the initiator of the link to the remote peer. This can only happen
+once the link has been established, and is carried out over the encrypted link.
+The identity is only revealed to the remote peer, and initiator anonymity is
+thus preserved. This method can be used for authentication.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>identity</strong> – An RNS.Identity instance to identify as.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Link.request">
+<span class="sig-name descname"><span class="pre">request</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">data</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">response_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">failed_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">progress_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">timeout</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.request" title="Permalink to this definition">¶</a></dt>
+<dd><p>Sends a request to the remote peer.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><ul class="simple">
+<li><p><strong>path</strong> – The request path.</p></li>
+<li><p><strong>response_callback</strong> – An optional function or method with the signature <em>response_callback(request_receipt)</em> to be called when a response is received. See the <a class="reference internal" href="examples.html#example-request"><span class="std std-ref">Request Example</span></a> for more info.</p></li>
+<li><p><strong>failed_callback</strong> – An optional function or method with the signature <em>failed_callback(request_receipt)</em> to be called when a request fails. See the <a class="reference internal" href="examples.html#example-request"><span class="std std-ref">Request Example</span></a> for more info.</p></li>
+<li><p><strong>progress_callback</strong> – An optional function or method with the signature <em>progress_callback(request_receipt)</em> to be called when progress is made receiving the response. Progress can be accessed as a float between 0.0 and 1.0 by the <em>request_receipt.progress</em> property.</p></li>
+<li><p><strong>timeout</strong> – An optional timeout in seconds for the request. If <em>None</em> is supplied it will be calculated based on link RTT.</p></li>
+</ul>
+</dd>
+<dt class="field-even">Returns</dt>
+<dd class="field-even"><p>A <a class="reference internal" href="#api-requestreceipt"><span class="std std-ref">RNS.RequestReceipt</span></a> instance if the request was sent, or <em>False</em> if it was not.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Link.no_inbound_for">
 <span class="sig-name descname"><span class="pre">no_inbound_for</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.no_inbound_for" title="Permalink to this definition">¶</a></dt>
@@ -762,6 +864,16 @@ from a the <em>send()</em> method of a <a class="reference internal" href="#api-
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Link.get_remote_identity">
+<span class="sig-name descname"><span class="pre">get_remote_identity</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.get_remote_identity" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The identity of the remote peer, if it is known</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Link.teardown">
 <span class="sig-name descname"><span class="pre">teardown</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.teardown" title="Permalink to this definition">¶</a></dt>
@@ -770,8 +882,8 @@ be used if a new link to the same destination is established.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Link.packet_callback">
-<span class="sig-name descname"><span class="pre">packet_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.packet_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Link.set_packet_callback">
+<span class="sig-name descname"><span class="pre">set_packet_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_packet_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a packet has been
 received over this link.</p>
 <dl class="field-list simple">
@@ -782,8 +894,8 @@ received over this link.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Link.resource_callback">
-<span class="sig-name descname"><span class="pre">resource_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.resource_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Link.set_resource_callback">
+<span class="sig-name descname"><span class="pre">set_resource_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_resource_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a resource has been
 advertised over this link. If the function returns <em>True</em>
 the resource will be accepted. If it returns <em>False</em> it will
@@ -796,8 +908,8 @@ be ignored.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Link.resource_started_callback">
-<span class="sig-name descname"><span class="pre">resource_started_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.resource_started_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Link.set_resource_started_callback">
+<span class="sig-name descname"><span class="pre">set_resource_started_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_resource_started_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a resource has begun
 transferring over this link.</p>
 <dl class="field-list simple">
@@ -808,8 +920,8 @@ transferring over this link.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Link.resource_concluded_callback">
-<span class="sig-name descname"><span class="pre">resource_concluded_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.resource_concluded_callback" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Link.set_resource_concluded_callback">
+<span class="sig-name descname"><span class="pre">set_resource_concluded_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_resource_concluded_callback" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers a function to be called when a resource has concluded
 transferring over this link.</p>
 <dl class="field-list simple">
@@ -819,6 +931,18 @@ transferring over this link.</p>
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Link.set_remote_identified_callback">
+<span class="sig-name descname"><span class="pre">set_remote_identified_callback</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">callback</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_remote_identified_callback" title="Permalink to this definition">¶</a></dt>
+<dd><p>Registers a function to be called when an initiating peer has
+identified over this link.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>callback</strong> – A function or method with the signature <em>callback(identity)</em> to be called.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Link.set_resource_strategy">
 <span class="sig-name descname"><span class="pre">set_resource_strategy</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">resource_strategy</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.set_resource_strategy" title="Permalink to this definition">¶</a></dt>
@@ -833,16 +957,65 @@ transferring over this link.</p>
 </dl>
 </dd></dl>
 
+</dd></dl>
+
+</div>
+<div class="section" id="request-receipt">
+<span id="api-requestreceipt"></span><h3>Request Receipt<a class="headerlink" href="#request-receipt" title="Permalink to this headline">¶</a></h3>
+<dl class="py class">
+<dt class="sig sig-object py" id="RNS.RequestReceipt">
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">RequestReceipt</span></span><a class="headerlink" href="#RNS.RequestReceipt" title="Permalink to this definition">¶</a></dt>
+<dd><p>An instance of this class is returned by the <code class="docutils literal notranslate"><span class="pre">request</span></code> method of <code class="docutils literal notranslate"><span class="pre">RNS.Link</span></code>
+instances. It should never be instantiated manually. It provides methods to
+check status, response time and response data when the request concludes.</p>
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Link.disable_encryption">
-<span class="sig-name descname"><span class="pre">disable_encryption</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Link.disable_encryption" title="Permalink to this definition">¶</a></dt>
-<dd><p>HAZARDOUS. This will downgrade the link to encryptionless. All
-information over the link will be sent in plaintext. Never use
-this in production applications. Should only be used for debugging
-purposes, and will disappear in a future version.</p>
-<p>If encryptionless links are not explicitly allowed in the users
-configuration file, Reticulum will terminate itself along with the
-client application and throw an error message to the user.</p>
+<dt class="sig sig-object py" id="RNS.RequestReceipt.get_request_id">
+<span class="sig-name descname"><span class="pre">get_request_id</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.RequestReceipt.get_request_id" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The request ID as <em>bytes</em>.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.RequestReceipt.get_status">
+<span class="sig-name descname"><span class="pre">get_status</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.RequestReceipt.get_status" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The current status of the request, one of <code class="docutils literal notranslate"><span class="pre">RNS.RequestReceipt.FAILED</span></code>, <code class="docutils literal notranslate"><span class="pre">RNS.RequestReceipt.SENT</span></code>, <code class="docutils literal notranslate"><span class="pre">RNS.RequestReceipt.DELIVERED</span></code>, <code class="docutils literal notranslate"><span class="pre">RNS.RequestReceipt.READY</span></code>.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.RequestReceipt.get_progress">
+<span class="sig-name descname"><span class="pre">get_progress</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.RequestReceipt.get_progress" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The progress of a response being received as a <em>float</em> between 0.0 and 1.0.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.RequestReceipt.get_response">
+<span class="sig-name descname"><span class="pre">get_response</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.RequestReceipt.get_response" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The response as <em>bytes</em> if it is ready, otherwise <em>None</em>.</p>
+</dd>
+</dl>
+</dd></dl>
+
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.RequestReceipt.get_response_time">
+<span class="sig-name descname"><span class="pre">get_response_time</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.RequestReceipt.get_response_time" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Returns</dt>
+<dd class="field-odd"><p>The response time of the request in seconds.</p>
+</dd>
+</dl>
 </dd></dl>
 
 </dd></dl>
@@ -852,7 +1025,7 @@ client application and throw an error message to the user.</p>
 <span id="api-resource"></span><h3>Resource<a class="headerlink" href="#resource" title="Permalink to this headline">¶</a></h3>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.Resource">
-<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Resource</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">link</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">advertise</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">auto_compress</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">must_compress</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">progress_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">segment_index</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">original_hash</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Resource" title="Permalink to this definition">¶</a></dt>
+<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Resource</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">link</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">advertise</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">auto_compress</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">progress_callback</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">timeout</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Resource" title="Permalink to this definition">¶</a></dt>
 <dd><p>The Resource class allows transferring arbitrary amounts
 of data over a link. It will automatically handle sequencing,
 compression, coordination and checksumming.</p>
@@ -861,13 +1034,10 @@ compression, coordination and checksumming.</p>
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>data</strong> – The data to be transferred. Can be <em>bytes</em> or an open <em>file handle</em>. See the <a class="reference internal" href="examples.html#example-filetransfer"><span class="std std-ref">Filetransfer Example</span></a> for details.</p></li>
 <li><p><strong>link</strong> – The <a class="reference internal" href="#api-link"><span class="std std-ref">RNS.Link</span></a> instance on which to transfer the data.</p></li>
-<li><p><strong>advertise</strong> – Whether to automatically advertise the resource. Can be <em>True</em> or <em>False</em>.</p></li>
-<li><p><strong>auto_compress</strong> – Whether to auto-compress the resource. Can be <em>True</em> or <em>False</em>.</p></li>
-<li><p><strong>auto_compress</strong> – Whether the resource must be compressed. Can be <em>True</em> or <em>False</em>. Used for debugging, will disappear in the future.</p></li>
-<li><p><strong>callback</strong> – A <em>callable</em> with the signature <em>callback(resource)</em>. Will be called when the resource transfer concludes.</p></li>
-<li><p><strong>progress_callback</strong> – A <em>callable</em> with the signature <em>callback(resource)</em>. Will be called whenever the resource transfer progress is updated.</p></li>
-<li><p><strong>segment_index</strong> – Internal use, ignore.</p></li>
-<li><p><strong>original_hash</strong> – Internal use, ignore.</p></li>
+<li><p><strong>advertise</strong> – Optional. Whether to automatically advertise the resource. Can be <em>True</em> or <em>False</em>.</p></li>
+<li><p><strong>auto_compress</strong> – Optional. Whether to auto-compress the resource. Can be <em>True</em> or <em>False</em>.</p></li>
+<li><p><strong>callback</strong> – An optional <em>callable</em> with the signature <em>callback(resource)</em>. Will be called when the resource transfer concludes.</p></li>
+<li><p><strong>progress_callback</strong> – An optional <em>callable</em> with the signature <em>callback(resource)</em>. Will be called whenever the resource transfer progress is updated.</p></li>
 </ul>
 </dd>
 </dl>
@@ -885,8 +1055,8 @@ the resource advertisement it will begin transferring.</p>
 </dd></dl>
 
 <dl class="py method">
-<dt class="sig sig-object py" id="RNS.Resource.progress">
-<span class="sig-name descname"><span class="pre">progress</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Resource.progress" title="Permalink to this definition">¶</a></dt>
+<dt class="sig sig-object py" id="RNS.Resource.get_progress">
+<span class="sig-name descname"><span class="pre">get_progress</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Resource.get_progress" title="Permalink to this definition">¶</a></dt>
 <dd><dl class="field-list simple">
 <dt class="field-odd">Returns</dt>
 <dd class="field-odd"><p>The current progress of the resource transfer as a <em>float</em> between 0.0 and 1.0.</p>
@@ -902,7 +1072,15 @@ the resource advertisement it will begin transferring.</p>
 <dl class="py class">
 <dt class="sig sig-object py" id="RNS.Transport">
 <em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">RNS.</span></span><span class="sig-name descname"><span class="pre">Transport</span></span><a class="headerlink" href="#RNS.Transport" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="py method">
+<dd><p>Through static methods of this class you can interact with Reticulums
+Transport system.</p>
+<dl class="py attribute">
+<dt class="sig sig-object py" id="RNS.Transport.PATHFINDER_M">
+<span class="sig-name descname"><span class="pre">PATHFINDER_M</span></span><em class="property"> <span class="pre">=</span> <span class="pre">128</span></em><a class="headerlink" href="#RNS.Transport.PATHFINDER_M" title="Permalink to this definition">¶</a></dt>
+<dd><p>Maximum amount of hops that Reticulum will transport a packet.</p>
+</dd></dl>
+
+<dl class="py method">
 <dt class="sig sig-object py" id="RNS.Transport.register_announce_handler">
 <em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">register_announce_handler</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">handler</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Transport.register_announce_handler" title="Permalink to this definition">¶</a></dt>
 <dd><p>Registers an announce handler.</p>
@@ -937,6 +1115,19 @@ the resource advertisement it will begin transferring.</p>
 </dl>
 </dd></dl>
 
+<dl class="py method">
+<dt class="sig sig-object py" id="RNS.Transport.hops_to">
+<em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">hops_to</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination_hash</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Transport.hops_to" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><p><strong>destination_hash</strong> – A destination hash as <em>bytes</em>.</p>
+</dd>
+<dt class="field-even">Returns</dt>
+<dd class="field-even"><p>The number of hops to the specified destination, or <code class="docutils literal notranslate"><span class="pre">RNS.Transport.PATHFINDER_M</span></code> if the number of hops is unknown.</p>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py method">
 <dt class="sig sig-object py" id="RNS.Transport.request_path">
 <em class="property"><span class="pre">static</span> </em><span class="sig-name descname"><span class="pre">request_path</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">destination_hash</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#RNS.Transport.request_path" title="Permalink to this definition">¶</a></dt>
@@ -973,6 +1164,7 @@ will announce it.</p>
 <li><a class="reference internal" href="#packet">Packet</a></li>
 <li><a class="reference internal" href="#packet-receipt">Packet Receipt</a></li>
 <li><a class="reference internal" href="#link">Link</a></li>
+<li><a class="reference internal" href="#request-receipt">Request Receipt</a></li>
 <li><a class="reference internal" href="#resource">Resource</a></li>
 <li><a class="reference internal" href="#transport">Transport</a></li>
 </ul>
@@ -982,11 +1174,11 @@ will announce it.</p>
 </ul>
 
   <h4>Previous topic</h4>
-  <p class="topless"><a href="examples.html"
-                        title="previous chapter">Examples</a></p>
-  <h4>Next topic</h4>
   <p class="topless"><a href="understanding.html"
-                        title="next chapter">Understanding Reticulum</a></p>
+                        title="previous chapter">Understanding Reticulum</a></p>
+  <h4>Next topic</h4>
+  <p class="topless"><a href="examples.html"
+                        title="next chapter">Examples</a></p>
   <div role="note" aria-label="source link">
     <h3>This Page</h3>
     <ul class="this-page-menu">
@@ -1015,12 +1207,12 @@ will announce it.</p>
           <a href="genindex.html" title="General Index"
              >index</a></li>
         <li class="right" >
-          <a href="understanding.html" title="Understanding Reticulum"
+          <a href="examples.html" title="Examples"
              >next</a> |</li>
         <li class="right" >
-          <a href="examples.html" title="Examples"
+          <a href="understanding.html" title="Understanding Reticulum"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">API Reference</a></li> 
       </ul>
     </div>

docs/manual/search.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Search &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Search &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -29,7 +29,7 @@
         <li class="right" style="margin-right: 10px">
           <a href="genindex.html" title="General Index"
              accesskey="I">index</a></li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Search</a></li> 
       </ul>
     </div>  
@@ -85,7 +85,7 @@
         <li class="right" style="margin-right: 10px">
           <a href="genindex.html" title="General Index"
              >index</a></li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Search</a></li> 
       </ul>
     </div>

docs/manual/understanding.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Understanding Reticulum &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>Understanding Reticulum &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -16,7 +16,8 @@
     
     <link rel="index" title="Index" href="genindex.html" />
     <link rel="search" title="Search" href="search.html" />
-    <link rel="prev" title="API Reference" href="reference.html" /> 
+    <link rel="next" title="API Reference" href="reference.html" />
+    <link rel="prev" title="Getting Started Fast" href="gettingstartedfast.html" /> 
   </head><body>
     <div class="related" role="navigation" aria-label="related navigation">
       <h3>Navigation</h3>
@@ -26,8 +27,11 @@
              accesskey="I">index</a></li>
         <li class="right" >
           <a href="reference.html" title="API Reference"
+             accesskey="N">next</a> |</li>
+        <li class="right" >
+          <a href="gettingstartedfast.html" title="Getting Started Fast"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Understanding Reticulum</a></li> 
       </ul>
     </div>  
@@ -201,12 +205,14 @@ when a node is directly reachable.</p>
 </ul>
 <div class="section" id="destination-naming">
 <span id="understanding-destinationnaming"></span><h4>Destination Naming<a class="headerlink" href="#destination-naming" title="Permalink to this headline">¶</a></h4>
-<p>Destinations are created and named in an easy to understand dotted notation of <em>aspects</em> , and
+<p>Destinations are created and named in an easy to understand dotted notation of <em>aspects</em>, and
 represented on the network as a hash of this value. The hash is a SHA-256 truncated to 80 bits. The
 top level aspect should always be a unique identifier for the application using the destination.
-The next levels of aspects can be defined in any way by the creator of the application. For example,
-a destination for a environmental monitoring application could be made up of the application name, a
-device type and measurement type, like this:</p>
+The next levels of aspects can be defined in any way by the creator of the application.</p>
+<p>Aspects can be as long and as plentiful as required, and a resulting long destination name will not
+impact efficiency, as names are always represented as truncated SHA-256 hashes on the network.</p>
+<p>As an example, a destination for a environmental monitoring application could be made up of the
+application name, a device type and measurement type, like this:</p>
 <div class="highlight-text notranslate"><div class="highlight"><pre><span></span>app name  : environmentlogger
 aspects   : remotesensor, temperature
 
@@ -242,9 +248,8 @@ receives.</p>
 </dl>
 </li>
 <li><dl class="simple">
-<dt><strong>Group</strong></dt><dd><p>When private communication between two or more endpoints is needed. More efficient in
-data usage than <em>single</em> destinations. Supports multiple hops indirectly, but must first be
-established through a <em>single</em> destination.</p>
+<dt><strong>Group</strong></dt><dd><p>When private communication between two or more endpoints is needed. Supports multiple hops
+indirectly, but must first be established through a <em>single</em> destination.</p>
 </dd>
 </dl>
 </li>
@@ -260,9 +265,9 @@ nodes aware of your destinations public key, called the <em>announce</em>. It is
 an unknown public key from the network, as all participating nodes serve as a distributed ledger
 of public keys.</p>
 <p>Note that public key information can be shared and verified in many other ways than using the
-built-in methodology, and that it is therefore not required to use the announce/request functionality.
-It is by far the easiest though, and should definitely be used if there is not a good reason for
-doing it differently.</p>
+built-in <em>announce</em> functionality, and that it is therefore not required to use the announce/request
+functionality to obtain public keys. It is by far the easiest though, and should definitely be used
+if there is not a good reason for doing it differently.</p>
 </div>
 </div>
 <div class="section" id="public-key-announcements">
@@ -278,7 +283,7 @@ contain the following information:</p>
 <li><p>The announcers public key</p></li>
 <li><p>Application specific data, in this case the users nickname and availability status</p></li>
 <li><p>A random blob, making each new announce unique</p></li>
-<li><p>A signature of the above information, verifying authenticity</p></li>
+<li><p>An Ed25519 signature of the above information, verifying authenticity</p></li>
 </ul>
 <p>With this information, any Reticulum node that receives it will be able to reconstruct an outgoing
 destination to securely communicate with that destination. You might have noticed that there is one
@@ -286,8 +291,9 @@ piece of information lacking to reconstruct full knowledge of the announced dest
 the aspect names of the destination. These are intentionally left out to save bandwidth, since they
 will be implicit in almost all cases. If a destination name is not entirely implicit, information can be
 included in the application specific data part that will allow the receiver to infer the naming.</p>
-<p>It is important to note that announcements will be forwarded throughout the network according to a
-certain pattern. This will be detailed later.</p>
+<p>It is important to note that announces will be forwarded throughout the network according to a
+certain pattern. This will be detailed in the section
+<a class="reference internal" href="#understanding-announce"><span class="std std-ref">The Announce Mechanism in Detail</span></a>.</p>
 <p>Seeing how <em>single</em> destinations are always tied to a private/public key pair leads us to the next topic.</p>
 </div>
 <div class="section" id="understanding-identities">
@@ -304,16 +310,16 @@ automatically. This may be desirable in some situations, but often you will prob
 the identity first, and then link it to created destinations.</p>
 <p>Building upon the simple messenger example, we could use an identity to represent the user of the
 application. Destinations created will then be linked to this identity to allow communication to
-reach the user. In such a case it is of great importance to store the user’s identity securely and
-privately.</p>
+reach the user. In all cases it is of great importance to store the private keys associated with any
+Reticulum Identity securely and privately.</p>
 </div>
 <div class="section" id="getting-further">
 <span id="understanding-gettingfurther"></span><h3>Getting Further<a class="headerlink" href="#getting-further" title="Permalink to this headline">¶</a></h3>
 <p>The above functions and principles form the core of Reticulum, and would suffice to create
 functional networked applications in local clusters, for example over radio links where all interested
 nodes can directly hear each other. But to be truly useful, we need a way to direct traffic over multiple
-hops in the network. In the next sections, two concepts that allow this will be introduced, <em>paths</em> and
-<em>links</em>.</p>
+hops in the network.</p>
+<p>In the following sections, two concepts that allow this will be introduced, <em>paths</em> and <em>links</em>.</p>
 </div>
 </div>
 <div class="section" id="reticulum-transport">
@@ -327,69 +333,20 @@ very limited. Existing routing protocols like BGP or OSPF carry too much overhea
 useable over bandwidth-limited, high-latency links.</p>
 <p>To overcome such challenges, Reticulum’s <em>Transport</em> system uses public-key cryptography to
 implement the concept of <em>paths</em> that allow discovery of how to get information to a certain
-destination, and <em>resources</em> that help make reliable data transfer more efficient.</p>
-<div class="section" id="reaching-the-destination">
-<span id="understanding-paths"></span><h3>Reaching the Destination<a class="headerlink" href="#reaching-the-destination" title="Permalink to this headline">¶</a></h3>
-<p>In networks with changing topology and trustless connectivity, nodes need a way to establish
-<em>verified connectivity</em> with each other. Since the network is assumed to be trustless, Reticulum
-must provide a way to guarantee that the peer you are communicating with is actually who you
-expect. To do this, the following process is employed:</p>
+destination. It is important to note that no single node in a Reticulum network knows the complete
+path to a destination. Every Transport node participating in a Reticulum network will only
+know what the most direct way to get a packet one hop closer to it’s destination is.</p>
+<div class="section" id="the-announce-mechanism-in-detail">
+<span id="understanding-announce"></span><h3>The Announce Mechanism in Detail<a class="headerlink" href="#the-announce-mechanism-in-detail" title="Permalink to this headline">¶</a></h3>
+<p>When an <em>announce</em> is transmitted by a node, it will be forwarded by any node receiving it, but
+according to some specific rules:</p>
 <ul>
 <li><div class="line-block">
-<div class="line">First, the node that wishes to establish connectivity will send out a special packet, that
-traverses the network and locates the desired destination. Along the way, the nodes that
-forward the packet will take note of this <em>link request</em>.</div>
+<div class="line">If this exact announce has already been received before, ignore it.</div>
 </div>
 </li>
 <li><div class="line-block">
-<div class="line">Second, if the destination accepts the <em>link request</em> , it will send back a packet that proves the
-authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
-nodes that initially forwarded the packet will also be able to verify this proof, and thus
-accept the validity of the <em>link</em> throughout the network.</div>
-</div>
-</li>
-<li><div class="line-block">
-<div class="line">When the validity of the <em>link</em> has been accepted by forwarding nodes, these nodes will
-remember the <em>link</em> , and it can subsequently be used by referring to a hash representing it.</div>
-</div>
-</li>
-<li><div class="line-block">
-<div class="line">As a part of the <em>link request</em> , a Diffie-Hellman key exchange takes place, that sets up an
-efficient symmetrically encrypted tunnel between the two nodes, using elliptic curve
-cryptography. As such, this mode of communication is preferred, even for situations when
-nodes can directly communicate, when the amount of data to be exchanged numbers in the
-tens of packets.</div>
-</div>
-</li>
-<li><div class="line-block">
-<div class="line">When a <em>link</em> has been set up, it automatically provides message receipt functionality, so the
-sending node can obtain verified confirmation that the information reached the intended
-recipient.</div>
-</div>
-</li>
-</ul>
-<p>In a moment, we will discuss the specifics of how this methodology is implemented, but let’s first
-recap what purposes this serves. We first ensure that the node answering our request is actually the
-one we want to communicate with, and not a malicious actor pretending to be so. At the same time
-we establish an efficient encrypted channel. The setup of this is relatively cheap in terms of
-bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will also
-rotate encryption keys, but the link can also be kept alive for longer periods of time, if this is
-more suitable to the application. The amount of bandwidth used on keeping a link open is practically
-negligible. The procedure also inserts the <em>link id</em> , a hash calculated from the link request packet,
-into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each
-other simply by referring to this <em>link id</em>.</p>
-<div class="section" id="step-1-pathfinding">
-<h4>Step 1: Pathfinding<a class="headerlink" href="#step-1-pathfinding" title="Permalink to this headline">¶</a></h4>
-<p>The pathfinding method builds on the <em>announce</em> functionality discussed earlier. When an announce
-is sent out by a node, it will be forwarded by any node receiving it, but according to some specific
-rules:</p>
-<ul>
-<li><div class="line-block">
-<div class="line">If this announce has already been received before, ignore it.</div>
-</div>
-</li>
-<li><div class="line-block">
-<div class="line">Record into a table which node the announce was received from, and how many times in
+<div class="line">If not, record into a table which node the announce was received from, and how many times in
 total it has been retransmitted to get here.</div>
 </div>
 </li>
@@ -399,8 +356,7 @@ set to 18.</div>
 </div>
 </li>
 <li><div class="line-block">
-<div class="line">The announce will be assigned a delay <em>d</em> = c<sup>h</sup> seconds, where <em>c</em> is a decay constant, by
-default 2, and <em>h</em> is the amount of times this packet has already been forwarded.</div>
+<div class="line">The announce will be assigned a delay <em>d</em> = c<sup>h</sup> seconds, where <em>c</em> is a decay constant, and <em>h</em> is the amount of times this packet has already been forwarded.</div>
 </div>
 </li>
 <li><div class="line-block">
@@ -415,10 +371,11 @@ not utilized by other traffic, the announce will be forwarded.</div>
 </li>
 <li><div class="line-block">
 <div class="line">If no other nodes are heard retransmitting the announce with a greater hop count than when
-it left this node, transmitting it will be retried <em>r</em> times. By default, <em>r</em> is set to 2. Retries follow
-same rules as above, with the exception that it must wait for at least <em>d</em> = c<sup>h+1</sup> + t seconds, ie.,
-the amount of time it would take the next node to retransmit the packet. By default, <em>t</em> is set to
-10.</div>
+it left this node, transmitting it will be retried <em>r</em> times. By default, <em>r</em> is set to 1. Retries
+follow same rules as above, with the exception that it must wait for at least <em>d</em> = c<sup>h+1</sup> +
+t + rand(0, rw) seconds. This amount of time is equal to the amount of time it would take the next
+node to retransmit the packet, plus a random window. By default, <em>t</em> is set to 10 seconds, and the
+random window <em>rw</em> is set to 10 seconds.</div>
 </div>
 </li>
 <li><div class="line-block">
@@ -440,13 +397,111 @@ distance of <em>Lavg =</em> 15 kilometers, an announce will be able to propagate
 kilometers in 34 minutes, and a <em>maximum announce radius</em> of 270 kilometers in approximately 3
 days.</p>
 </div>
-<div class="section" id="step-2-link-establishment">
-<h4>Step 2: Link Establishment<a class="headerlink" href="#step-2-link-establishment" title="Permalink to this headline">¶</a></h4>
-<p>After seeing how the conditions for finding a path through the network are created, we will now
-explore how two nodes can establish reliable communications over multiple hops. The <em>link</em> in
-Reticulum terminology should not be viewed as a direct node-to-node link on the physical layer, but
-as an abstract channel, that can be open for any amount of time, and can span an arbitrary number
-of hops, where information will be exchanged between two nodes.</p>
+<div class="section" id="reaching-the-destination">
+<span id="understanding-paths"></span><h3>Reaching the Destination<a class="headerlink" href="#reaching-the-destination" title="Permalink to this headline">¶</a></h3>
+<p>In networks with changing topology and trustless connectivity, nodes need a way to establish
+<em>verified connectivity</em> with each other. Since the network is assumed to be trustless, Reticulum
+must provide a way to guarantee that the peer you are communicating with is actually who you
+expect. Reticulum offers two ways to do this.</p>
+<p>For exchanges of small amounts of information, Reticulum offers the <em>Packet</em> API, which works exactly like you would expect - on a per packet level. The following process is employed when sending a packet:</p>
+<ul>
+<li><div class="line-block">
+<div class="line">A packet is always created with an associated destination and some payload data. When the packet is sent
+to a <em>single</em> destination type, Reticulum will automatically create an ephemeral encryption key, perform
+an ECDH key exchange with the destinations public key, and encrypt the information.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">It is important to note that this key exchange does not require any network traffic. The sender already
+knows the public key of the destination from an earlier received <em>announce</em>, and can thus perform the ECDH
+key exchange locally, before sending the packet.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">The public part of the newly generated ephemeral key-pair is included with the encrypted token, and sent
+along with the encrypted payload data in the packet.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">When the destination receives the packet, it can itself perform an ECDH key exchange and decrypt the
+packet.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">A new ephemeral key is used for every packet sent in this way, and forward secrecy is guaranteed on a
+per packet level.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">Once the packet has been received and decrypted by the addressed destination, that destination can opt
+to <em>prove</em> its receipt of the packet. It does this by calculating the SHA-256 hash of the received packet,
+and signing this hash with it’s Ed25519 signing key. Transport nodes in the network can then direct this
+<em>proof</em> back to the packets origin, where the signature can be verified against the destinations known
+public signing key.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">In case the packet is addressed to a <em>group</em> destination type, the packet will be encrypted with the
+pre-shared AES-128 key associated with the destination. In case the packet is addressed to a <em>plain</em>
+destination type, the payload data will not be encrypted. Neither of these two destination types offer
+forward secrecy. In general, it is recommended to always use the <em>single</em> destination type, unless it is
+strictly necessary to use one of the others.</div>
+</div>
+</li>
+</ul>
+<p>For exchanges of larger amounts of data, or when longer sessions of bidirectional communication is desired, Reticulum offers the <em>Link</em> API. To establish a <em>link</em>, the following process is employed:</p>
+<ul>
+<li><div class="line-block">
+<div class="line">First, the node that wishes to establish a link will send out a special packet, that
+traverses the network and locates the desired destination. Along the way, the nodes that
+forward the packet will take note of this <em>link request</em>.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">Second, if the destination accepts the <em>link request</em> , it will send back a packet that proves the
+authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
+nodes that initially forwarded the packet will also be able to verify this proof, and thus
+accept the validity of the <em>link</em> throughout the network.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">When the validity of the <em>link</em> has been accepted by forwarding nodes, these nodes will
+remember the <em>link</em> , and it can subsequently be used by referring to a hash representing it.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">As a part of the <em>link request</em> , a Diffie-Hellman key exchange takes place, that sets up an
+efficiently encrypted tunnel between the two nodes, using elliptic curve cryptography. As such,
+this mode of communication is preferred, even for situations when nodes can directly communicate,
+when the amount of data to be exchanged numbers in the tens of packets.</div>
+</div>
+</li>
+<li><div class="line-block">
+<div class="line">When a <em>link</em> has been set up, it automatically provides message receipt functionality, through
+the same <em>proof</em> mechanism discussed before, so the sending node can obtain verified confirmation
+that the information reached the intended recipient.</div>
+</div>
+</li>
+</ul>
+<p>In a moment, we will discuss the details of how this methodology is implemented, but let’s first
+recap what purposes this methodology serves. We first ensure that the node answering our request
+is actually the one we want to communicate with, and not a malicious actor pretending to be so.
+At the same time we establish an efficient encrypted channel. The setup of this is relatively cheap in
+terms of bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will
+also rotate encryption keys. The link can also be kept alive for longer periods of time, if this is
+more suitable to the application. The procedure also inserts the <em>link id</em> , a hash calculated from the link request packet, into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each other simply by referring to this <em>link id</em>.</p>
+<p>The combined bandwidth cost of setting up a link is 3 packets totalling 237 bytes (more info in the
+<a class="reference internal" href="#understanding-packetformat"><span class="std std-ref">Binary Packet Format</span></a> section). The amount of bandwidth used on keeping
+a link open is practically negligible, at 0.62 bits per second. Even on a slow 1200 bits per second packet
+radio channel, 100 concurrent links will still leave 95% channel capacity for actual data.</p>
+<div class="section" id="link-establishment-in-detail">
+<h4>Link Establishment in Detail<a class="headerlink" href="#link-establishment-in-detail" title="Permalink to this headline">¶</a></h4>
+<p>After exploring the basics of the announce mechanism, finding a path through the network, and an overview
+of the link establishment procedure, this section will go into greater detail about the Reticulum link
+establishment process.</p>
+<p>The <em>link</em> in Reticulum terminology should not be viewed as a direct node-to-node link on the
+physical layer, but as an abstract channel, that can be open for any amount of time, and can span
+an arbitrary number of hops, where information will be exchanged between two nodes.</p>
 <ul>
 <li><div class="line-block">
 <div class="line">When a node in the network wants to establish verified connectivity with another node, it
@@ -461,8 +516,7 @@ considered as single public key for simplicity in this explanation.</em></div>
 </li>
 <li><div class="line-block">
 <div class="line">The <em>link request</em> is addressed to the destination hash of the desired destination, and
-contains the following data: The newly generated X25519 public key <em>LKi</em>. The contents
-are encrypted with the RSA public key of the destination and tramsitted over the network.</div>
+contains the following data: The newly generated X25519 public key <em>LKi</em>.</div>
 </div>
 </li>
 <li><div class="line-block">
@@ -473,21 +527,22 @@ previously.</div>
 <li><div class="line-block">
 <div class="line">Any node that forwards the link request will store a <em>link id</em> in it’s <em>link table</em> , along with the
 amount of hops the packet had taken when received. The link id is a hash of the entire link
-request packet. If the path is not <em>proven</em> within some set amount of time, the entry will be
-dropped from the <em>link table</em> again.</div>
+request packet. If the link request packet is not <em>proven</em> by the addressed destination within some
+set amount of time, the entry will be dropped from the <em>link table</em> again.</div>
 </div>
 </li>
 <li><div class="line-block">
-<div class="line">When the destination receives the link request packet, it will decrypt it and decide whether to
-accept the request. If it is accepted, the destination will also generate a new X25519 private/public
-key pair, and perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used
-to encrypt the channel, once it has been established.</div>
+<div class="line">When the destination receives the link request packet, it will decide whether to accept the request.
+If it is accepted, the destination will also generate a new X25519 private/public key pair, and
+perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used to encrypt the
+channel, once it has been established.</div>
 </div>
 </li>
 <li><div class="line-block">
 <div class="line">A <em>link proof</em> packet is now constructed and transmitted over the network. This packet is
 addressed to the <em>link id</em> of the <em>link</em>. It contains the following data: The newly generated X25519
-public key <em>LKr</em> and an RSA-1024 signature of the <em>link id</em> and <em>LKr</em>.</div>
+public key <em>LKr</em> and an Ed25519 signature of the <em>link id</em> and <em>LKr</em> made by the signing key of
+the addressed destination.</div>
 </div>
 </li>
 <li><div class="line-block">
@@ -615,7 +670,7 @@ the light of Reticulums goal of equal access, doing so would need to be the subj
 investigation of the consequences first.</p>
 </div>
 <div class="section" id="binary-packet-format">
-<h3>Binary Packet Format<a class="headerlink" href="#binary-packet-format" title="Permalink to this headline">¶</a></h3>
+<span id="understanding-packetformat"></span><h3>Binary Packet Format<a class="headerlink" href="#binary-packet-format" title="Permalink to this headline">¶</a></h3>
 <div class="highlight-text notranslate"><div class="highlight"><pre><span></span>== Reticulum Wire Format ======
 
 A Reticulum packet is composed of the following fields:
@@ -706,10 +761,10 @@ proof           11
  wire size including all fields.
 
  - Path Request    :    33  bytes
- - Announce        :    323 bytes
- - Link Request    :    141 bytes
- - Link Proof      :    205 bytes
- - Link RTT packet :    86  bytes
+ - Announce        :    151 bytes
+ - Link Request    :    77  bytes
+ - Link Proof      :    77  bytes
+ - Link RTT packet :    83  bytes
  - Link keepalive  :    14  bytes
 </pre></div>
 </div>
@@ -740,9 +795,9 @@ proof           11
 </ul>
 </li>
 <li><a class="reference internal" href="#reticulum-transport">Reticulum Transport</a><ul>
+<li><a class="reference internal" href="#the-announce-mechanism-in-detail">The Announce Mechanism in Detail</a></li>
 <li><a class="reference internal" href="#reaching-the-destination">Reaching the Destination</a><ul>
-<li><a class="reference internal" href="#step-1-pathfinding">Step 1: Pathfinding</a></li>
-<li><a class="reference internal" href="#step-2-link-establishment">Step 2: Link Establishment</a></li>
+<li><a class="reference internal" href="#link-establishment-in-detail">Link Establishment in Detail</a></li>
 </ul>
 </li>
 <li><a class="reference internal" href="#resources">Resources</a></li>
@@ -760,8 +815,11 @@ proof           11
 </ul>
 
   <h4>Previous topic</h4>
+  <p class="topless"><a href="gettingstartedfast.html"
+                        title="previous chapter">Getting Started Fast</a></p>
+  <h4>Next topic</h4>
   <p class="topless"><a href="reference.html"
-                        title="previous chapter">API Reference</a></p>
+                        title="next chapter">API Reference</a></p>
   <div role="note" aria-label="source link">
     <h3>This Page</h3>
     <ul class="this-page-menu">
@@ -791,8 +849,11 @@ proof           11
              >index</a></li>
         <li class="right" >
           <a href="reference.html" title="API Reference"
+             >next</a> |</li>
+        <li class="right" >
+          <a href="gettingstartedfast.html" title="Getting Started Fast"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Understanding Reticulum</a></li> 
       </ul>
     </div>

docs/manual/whatis.html

@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>What is Reticulum? &#8212; Reticulum Network Stack 0.2.0 beta documentation</title>
+    <title>What is Reticulum? &#8212; Reticulum Network Stack 0.2.4 beta documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css" />
     
@@ -31,7 +31,7 @@
         <li class="right" >
           <a href="index.html" title="Reticulum Network Stack Manual"
              accesskey="P">previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">What is Reticulum?</a></li> 
       </ul>
     </div>  
@@ -43,7 +43,8 @@
             
   <div class="section" id="what-is-reticulum">
 <h1>What is Reticulum?<a class="headerlink" href="#what-is-reticulum" title="Permalink to this headline">¶</a></h1>
-<p>Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth. Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.</p>
+<p>Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth.</p>
+<p>Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.</p>
 <p>Reticulum is a complete networking stack, and does not use IP or higher layers, although it is easy to utilise IP (with TCP or UDP) as the underlying carrier for Reticulum. It is therefore trivial to tunnel Reticulum over the Internet or private IP networks. Reticulum is built directly on cryptographic principles, allowing resilience and stable functionality in open and trustless networks.</p>
 <p>No kernel modules or drivers are required. Reticulum runs completely in userland, and can run on practically any system that runs Python 3.</p>
 <div class="section" id="current-status">
@@ -59,18 +60,19 @@
 <ul class="simple">
 <li><p>Coordination-less globally unique adressing and identification</p></li>
 <li><p>Fully self-configuring multi-hop routing</p></li>
-<li><p>Asymmetric RSA encryption and signatures as basis for all communication</p></li>
-<li><p>Perfect Forward Secrecy on links with ephemereal Elliptic Curve Diffie-Hellman keys (on Curve25519)</p></li>
-<li><p>Reticulum uses the Fernet specification for encryption on links and to group destinations</p>
+<li><p>Asymmetric X25519 encryption and Ed25519 signatures as a basis for all communication</p></li>
+<li><p>Forward Secrecy with ephemereal Elliptic Curve Diffie-Hellman keys on Curve25519</p></li>
+<li><p>Reticulum uses the <a class="reference external" href="https://github.com/fernet/spec/blob/master/Spec.md">Fernet</a> specification for encryption</p>
 <ul>
 <li><p>AES-128 in CBC mode with PKCS7 padding</p></li>
 <li><p>HMAC using SHA256 for authentication</p></li>
 <li><p>IVs are generated through os.urandom()</p></li>
+<li><p>Keys are ephemeral and derived from an ECDH key exchange on Curve25519</p></li>
 </ul>
 </li>
 <li><p>Unforgeable packet delivery confirmations</p></li>
 <li><p>A variety of supported interface types</p></li>
-<li><p>An intuitive and easy-to-use API</p></li>
+<li><p>An intuitive and developer-friendly API</p></li>
 <li><p>Reliable and efficient transfer of arbritrary amounts of data</p>
 <ul>
 <li><p>Reticulum can handle a few bytes of data or files of many gigabytes</p></li>
@@ -78,11 +80,17 @@
 <li><p>The API is very easy to use, and provides transfer progress</p></li>
 </ul>
 </li>
+<li><p>Efficient link establishment</p>
+<ul>
+<li><p>Total bandwidth cost of setting up a link is only 3 packets, totalling 237 bytes</p></li>
+<li><p>Low cost of keeping links open at only 0.62 bits per second</p></li>
+</ul>
+</li>
 </ul>
 </div>
 <div class="section" id="where-can-reticulum-be-used">
 <h2>Where can Reticulum be Used?<a class="headerlink" href="#where-can-reticulum-be-used" title="Permalink to this headline">¶</a></h2>
-<p>On practically any hardware that can support at least a half-duplex channel
+<p>Over practically any medium that can support at least a half-duplex channel
 with 1.000 bits per second throughput, and an MTU of 500 bytes. Data radios,
 modems, LoRa radios, serial lines, AX.25 TNCs, amateur radio digital modes,
 ad-hoc WiFi, free-space optical links and similar systems are all examples
@@ -174,7 +182,7 @@ network, and vice versa.</p>
         <li class="right" >
           <a href="index.html" title="Reticulum Network Stack Manual"
              >previous</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.0 beta documentation</a> &#187;</li>
+        <li class="nav-item nav-item-0"><a href="index.html">Reticulum Network Stack 0.2.4 beta documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">What is Reticulum?</a></li> 
       </ul>
     </div>

docs/source/conf.py

@@ -22,7 +22,7 @@ copyright = '2021, Mark Qvist'
 author = 'Mark Qvist'
 
 # The full version, including alpha/beta/rc tags
-release = '0.2.0 beta'
+release = '0.2.4 beta'
 
 
 # -- General configuration ---------------------------------------------------

docs/source/examples.rst

@@ -68,6 +68,29 @@ destination, and passing traffic back and forth over the link.
 
 This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Link.py>`_.
 
+.. _example-identify:
+
+Identification
+==============
+
+The *Identify* example explores identifying an intiator of a link, once
+the link has been established.
+
+.. literalinclude:: ../../Examples/Identify.py
+
+This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Identify.py>`_.
+
+.. _example-request:
+
+Requests & Responses
+====================
+
+The *Request* example explores sendig requests and receiving responses.
+
+.. literalinclude:: ../../Examples/Request.py
+
+This example can also be found at `<https://github.com/markqvist/Reticulum/blob/master/Examples/Request.py>`_.
+
 .. _example-filetransfer:
 
 Filetransfer

docs/source/gettingstartedfast.rst

@@ -1,7 +1,6 @@
 ********************
 Getting Started Fast
 ********************
-What do we want to do? Something! When do we want to do it? Right now! Let's go.
 
 The best way to get started with the Reticulum Network Stack depends on what
 you want to do. This guide will outline sensible starting paths for different
@@ -23,7 +22,7 @@ in the development for the messaging and information-sharing protocol
 Develop a Program with Reticulum
 ===========================================
 If you want to develop programs that use Reticulum, the easiest way to get
-started is to install Reticulum via pip:
+started is to install the latest release of Reticulum via pip:
 
 .. code::
 

docs/source/index.rst

@@ -10,9 +10,9 @@ the development of Reticulum itself.
 
    whatis
    gettingstartedfast
-   examples
-   reference
    understanding
+   reference
+   examples
 
 
 Indices and Tables

docs/source/reference.rst

@@ -39,7 +39,7 @@ Destination
 Packet
 ------
 
-.. autoclass:: RNS.Packet
+.. autoclass:: RNS.Packet(destination, data, create_receipt = True)
    :members:
 
 .. _api-packetreceipt:
@@ -47,7 +47,7 @@ Packet
 Packet Receipt
 --------------
 
-.. autoclass:: RNS.PacketReceipt
+.. autoclass:: RNS.PacketReceipt()
    :members:
 
 .. _api-link:
@@ -55,7 +55,15 @@ Packet Receipt
 Link
 ----
 
-.. autoclass:: RNS.Link
+.. autoclass:: RNS.Link(destination, established_callback=None, closed_callback = None)
+   :members:
+
+.. _api-requestreceipt:
+
+Request Receipt
+---------------
+
+.. autoclass:: RNS.RequestReceipt()
    :members:
 
 .. _api-resource:
@@ -63,7 +71,7 @@ Link
 Resource
 --------
 
-.. autoclass:: RNS.Resource
+.. autoclass:: RNS.Resource(data, link, advertise=True, auto_compress=True, callback=None, progress_callback=None, timeout=None)
    :members:
 
 .. _api-transport:

docs/source/understanding.rst

@@ -157,12 +157,16 @@ destinations. Reticulum uses three different basic destination types, and one sp
 Destination Naming
 ^^^^^^^^^^^^^^^^^^
 
-Destinations are created and named in an easy to understand dotted notation of *aspects* , and
+Destinations are created and named in an easy to understand dotted notation of *aspects*, and
 represented on the network as a hash of this value. The hash is a SHA-256 truncated to 80 bits. The
 top level aspect should always be a unique identifier for the application using the destination.
-The next levels of aspects can be defined in any way by the creator of the application. For example,
-a destination for a environmental monitoring application could be made up of the application name, a
-device type and measurement type, like this:
+The next levels of aspects can be defined in any way by the creator of the application.
+
+Aspects can be as long and as plentiful as required, and a resulting long destination name will not
+impact efficiency, as names are always represented as truncated SHA-256 hashes on the network.
+
+As an example, a destination for a environmental monitoring application could be made up of the
+application name, a device type and measurement type, like this:
 
 .. code-block:: text
 
@@ -201,9 +205,8 @@ To recap, the different destination types should be used in the following situat
 * **Single**
     When private communication between two endpoints is needed. Supports multiple hops.
 * **Group**
-    When private communication between two or more endpoints is needed. More efficient in
-    data usage than *single* destinations. Supports multiple hops indirectly, but must first be
-    established through a *single* destination.
+    When private communication between two or more endpoints is needed. Supports multiple hops
+    indirectly, but must first be established through a *single* destination.
 * **Plain**
     When plain-text communication is desirable, for example when broadcasting information.
 
@@ -214,9 +217,9 @@ an unknown public key from the network, as all participating nodes serve as a di
 of public keys.
 
 Note that public key information can be shared and verified in many other ways than using the
-built-in methodology, and that it is therefore not required to use the announce/request functionality.
-It is by far the easiest though, and should definitely be used if there is not a good reason for
-doing it differently.
+built-in *announce* functionality, and that it is therefore not required to use the announce/request
+functionality to obtain public keys. It is by far the easiest though, and should definitely be used
+if there is not a good reason for doing it differently.
 
 .. _understanding-keyannouncements:
 
@@ -235,7 +238,7 @@ contain the following information:
 * The announcers public key
 * Application specific data, in this case the users nickname and availability status
 * A random blob, making each new announce unique
-* A signature of the above information, verifying authenticity
+* An Ed25519 signature of the above information, verifying authenticity
 
 With this information, any Reticulum node that receives it will be able to reconstruct an outgoing
 destination to securely communicate with that destination. You might have noticed that there is one
@@ -244,8 +247,9 @@ the aspect names of the destination. These are intentionally left out to save ba
 will be implicit in almost all cases. If a destination name is not entirely implicit, information can be
 included in the application specific data part that will allow the receiver to infer the naming.
 
-It is important to note that announcements will be forwarded throughout the network according to a
-certain pattern. This will be detailed later.
+It is important to note that announces will be forwarded throughout the network according to a
+certain pattern. This will be detailed in the section
+:ref:`The Announce Mechanism in Detail<understanding-announce>`.
 
 Seeing how *single* destinations are always tied to a private/public key pair leads us to the next topic.
 
@@ -268,8 +272,8 @@ the identity first, and then link it to created destinations.
 
 Building upon the simple messenger example, we could use an identity to represent the user of the
 application. Destinations created will then be linked to this identity to allow communication to
-reach the user. In such a case it is of great importance to store the user’s identity securely and
-privately.
+reach the user. In all cases it is of great importance to store the private keys associated with any
+Reticulum Identity securely and privately.
 
 .. _understanding-gettingfurther:
 
@@ -279,8 +283,9 @@ Getting Further
 The above functions and principles form the core of Reticulum, and would suffice to create
 functional networked applications in local clusters, for example over radio links where all interested
 nodes can directly hear each other. But to be truly useful, we need a way to direct traffic over multiple
-hops in the network. In the next sections, two concepts that allow this will be introduced, *paths* and
-*links*.
+hops in the network.
+
+In the following sections, two concepts that allow this will be introduced, *paths* and *links*.
 
 .. _understanding-transport:
 
@@ -298,70 +303,28 @@ useable over bandwidth-limited, high-latency links.
 
 To overcome such challenges, Reticulum’s *Transport* system uses public-key cryptography to
 implement the concept of *paths* that allow discovery of how to get information to a certain
-destination, and *resources* that help make reliable data transfer more efficient.
+destination. It is important to note that no single node in a Reticulum network knows the complete
+path to a destination. Every Transport node participating in a Reticulum network will only
+know what the most direct way to get a packet one hop closer to it's destination is.
 
-.. _understanding-paths:
+.. _understanding-announce:
 
-Reaching the Destination
-------------------------
+The Announce Mechanism in Detail
+--------------------------------
 
-In networks with changing topology and trustless connectivity, nodes need a way to establish
-*verified connectivity* with each other. Since the network is assumed to be trustless, Reticulum
-must provide a way to guarantee that the peer you are communicating with is actually who you
-expect. To do this, the following process is employed:
+When an *announce* is transmitted by a node, it will be forwarded by any node receiving it, but
+according to some specific rules:
 
 
-* | First, the node that wishes to establish connectivity will send out a special packet, that
-    traverses the network and locates the desired destination. Along the way, the nodes that
-    forward the packet will take note of this *link request*.
+* | If this exact announce has already been received before, ignore it.
 
-* | Second, if the destination accepts the *link request* , it will send back a packet that proves the
-    authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
-    nodes that initially forwarded the packet will also be able to verify this proof, and thus
-    accept the validity of the *link* throughout the network.
-
-* | When the validity of the *link* has been accepted by forwarding nodes, these nodes will
-    remember the *link* , and it can subsequently be used by referring to a hash representing it.
-
-* | As a part of the *link request* , a Diffie-Hellman key exchange takes place, that sets up an
-    efficient symmetrically encrypted tunnel between the two nodes, using elliptic curve
-    cryptography. As such, this mode of communication is preferred, even for situations when
-    nodes can directly communicate, when the amount of data to be exchanged numbers in the
-    tens of packets.
-
-* | When a *link* has been set up, it automatically provides message receipt functionality, so the
-    sending node can obtain verified confirmation that the information reached the intended
-    recipient.
-
-In a moment, we will discuss the specifics of how this methodology is implemented, but let’s first
-recap what purposes this serves. We first ensure that the node answering our request is actually the
-one we want to communicate with, and not a malicious actor pretending to be so. At the same time
-we establish an efficient encrypted channel. The setup of this is relatively cheap in terms of
-bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will also
-rotate encryption keys, but the link can also be kept alive for longer periods of time, if this is
-more suitable to the application. The amount of bandwidth used on keeping a link open is practically
-negligible. The procedure also inserts the *link id* , a hash calculated from the link request packet,
-into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each
-other simply by referring to this *link id*.
-
-Step 1: Pathfinding
-^^^^^^^^^^^^^^^^^^^
-
-The pathfinding method builds on the *announce* functionality discussed earlier. When an announce
-is sent out by a node, it will be forwarded by any node receiving it, but according to some specific
-rules:
-
-
-* | If this announce has already been received before, ignore it.
-
-* | Record into a table which node the announce was received from, and how many times in
+* | If not, record into a table which node the announce was received from, and how many times in
     total it has been retransmitted to get here.
 
 * | If the announce has been retransmitted *m+1* times, it will not be forwarded. By default, *m* is
     set to 18.
 
-* | The announce will be assigned a delay *d* = c\ :sup:`h` seconds, where *c* is a decay constant, by
-    default 2, and *h* is the amount of times this packet has already been forwarded.
+* | The announce will be assigned a delay *d* = c\ :sup:`h` seconds, where *c* is a decay constant, and *h* is the amount of times this packet has already been forwarded.
 
 * | The packet will be given a priority *p = 1/d*.
 
@@ -370,10 +333,11 @@ rules:
     not utilized by other traffic, the announce will be forwarded.
 
 * | If no other nodes are heard retransmitting the announce with a greater hop count than when
-    it left this node, transmitting it will be retried *r* times. By default, *r* is set to 2. Retries follow
-    same rules as above, with the exception that it must wait for at least *d* = c\ :sup:`h+1` + t seconds, ie.,
-    the amount of time it would take the next node to retransmit the packet. By default, *t* is set to
-    10.
+    it left this node, transmitting it will be retried *r* times. By default, *r* is set to 1. Retries
+    follow same rules as above, with the exception that it must wait for at least *d* = c\ :sup:`h+1` +
+    t + rand(0, rw) seconds. This amount of time is equal to the amount of time it would take the next
+    node to retransmit the packet, plus a random window. By default, *t* is set to 10 seconds, and the
+    random window *rw* is set to 10 seconds.
 
 * | If a newer announce from the same destination arrives, while an identical one is already in
     the queue, the newest announce is discarded. If the newest announce contains different
@@ -392,14 +356,95 @@ distance of *Lavg =* 15 kilometers, an announce will be able to propagate outwar
 kilometers in 34 minutes, and a *maximum announce radius* of 270 kilometers in approximately 3
 days.
 
-Step 2: Link Establishment
-^^^^^^^^^^^^^^^^^^^^^^^^^^
+.. _understanding-paths:
 
-After seeing how the conditions for finding a path through the network are created, we will now
-explore how two nodes can establish reliable communications over multiple hops. The *link* in
-Reticulum terminology should not be viewed as a direct node-to-node link on the physical layer, but
-as an abstract channel, that can be open for any amount of time, and can span an arbitrary number
-of hops, where information will be exchanged between two nodes.
+Reaching the Destination
+------------------------
+
+In networks with changing topology and trustless connectivity, nodes need a way to establish
+*verified connectivity* with each other. Since the network is assumed to be trustless, Reticulum
+must provide a way to guarantee that the peer you are communicating with is actually who you
+expect. Reticulum offers two ways to do this.
+
+For exchanges of small amounts of information, Reticulum offers the *Packet* API, which works exactly like you would expect - on a per packet level. The following process is employed when sending a packet:
+
+* | A packet is always created with an associated destination and some payload data. When the packet is sent
+    to a *single* destination type, Reticulum will automatically create an ephemeral encryption key, perform
+    an ECDH key exchange with the destinations public key, and encrypt the information.
+
+* | It is important to note that this key exchange does not require any network traffic. The sender already
+    knows the public key of the destination from an earlier received *announce*, and can thus perform the ECDH
+    key exchange locally, before sending the packet.
+
+* | The public part of the newly generated ephemeral key-pair is included with the encrypted token, and sent
+    along with the encrypted payload data in the packet.
+
+* | When the destination receives the packet, it can itself perform an ECDH key exchange and decrypt the
+    packet.
+
+* | A new ephemeral key is used for every packet sent in this way, and forward secrecy is guaranteed on a
+    per packet level.
+
+* | Once the packet has been received and decrypted by the addressed destination, that destination can opt
+    to *prove* its receipt of the packet. It does this by calculating the SHA-256 hash of the received packet,
+    and signing this hash with it's Ed25519 signing key. Transport nodes in the network can then direct this
+    *proof* back to the packets origin, where the signature can be verified against the destinations known
+    public signing key.
+
+* | In case the packet is addressed to a *group* destination type, the packet will be encrypted with the
+    pre-shared AES-128 key associated with the destination. In case the packet is addressed to a *plain*
+    destination type, the payload data will not be encrypted. Neither of these two destination types offer
+    forward secrecy. In general, it is recommended to always use the *single* destination type, unless it is
+    strictly necessary to use one of the others.
+
+
+For exchanges of larger amounts of data, or when longer sessions of bidirectional communication is desired, Reticulum offers the *Link* API. To establish a *link*, the following process is employed:
+
+* | First, the node that wishes to establish a link will send out a special packet, that
+    traverses the network and locates the desired destination. Along the way, the nodes that
+    forward the packet will take note of this *link request*.
+
+* | Second, if the destination accepts the *link request* , it will send back a packet that proves the
+    authenticity of it’s identity (and the receipt of the link request) to the initiating node. All
+    nodes that initially forwarded the packet will also be able to verify this proof, and thus
+    accept the validity of the *link* throughout the network.
+
+* | When the validity of the *link* has been accepted by forwarding nodes, these nodes will
+    remember the *link* , and it can subsequently be used by referring to a hash representing it.
+
+* | As a part of the *link request* , a Diffie-Hellman key exchange takes place, that sets up an
+    efficiently encrypted tunnel between the two nodes, using elliptic curve cryptography. As such,
+    this mode of communication is preferred, even for situations when nodes can directly communicate,
+    when the amount of data to be exchanged numbers in the tens of packets.
+
+* | When a *link* has been set up, it automatically provides message receipt functionality, through
+    the same *proof* mechanism discussed before, so the sending node can obtain verified confirmation
+    that the information reached the intended recipient.
+
+In a moment, we will discuss the details of how this methodology is implemented, but let’s first
+recap what purposes this methodology serves. We first ensure that the node answering our request
+is actually the one we want to communicate with, and not a malicious actor pretending to be so.
+At the same time we establish an efficient encrypted channel. The setup of this is relatively cheap in
+terms of bandwidth, so it can be used just for a short exchange, and then recreated as needed, which will
+also rotate encryption keys. The link can also be kept alive for longer periods of time, if this is
+more suitable to the application. The procedure also inserts the *link id* , a hash calculated from the link request packet, into the memory of forwarding nodes, which means that the communicating nodes can thereafter reach each other simply by referring to this *link id*.
+
+The combined bandwidth cost of setting up a link is 3 packets totalling 237 bytes (more info in the
+:ref:`Binary Packet Format<understanding-packetformat>` section). The amount of bandwidth used on keeping
+a link open is practically negligible, at 0.62 bits per second. Even on a slow 1200 bits per second packet
+radio channel, 100 concurrent links will still leave 95% channel capacity for actual data.
+
+
+Link Establishment in Detail
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+After exploring the basics of the announce mechanism, finding a path through the network, and an overview
+of the link establishment procedure, this section will go into greater detail about the Reticulum link
+establishment process.
+
+The *link* in Reticulum terminology should not be viewed as a direct node-to-node link on the
+physical layer, but as an abstract channel, that can be open for any amount of time, and can span
+an arbitrary number of hops, where information will be exchanged between two nodes.
 
 
 * | When a node in the network wants to establish verified connectivity with another node, it
@@ -412,25 +457,25 @@ of hops, where information will be exchanged between two nodes.
     considered as single public key for simplicity in this explanation.*
 
 * | The *link request* is addressed to the destination hash of the desired destination, and
-    contains the following data: The newly generated X25519 public key *LKi*. The contents 
-    are encrypted with the RSA public key of the destination and tramsitted over the network.
+    contains the following data: The newly generated X25519 public key *LKi*.
 
 * | The broadcasted packet will be directed through the network according to the rules laid out
     previously.
 
 * | Any node that forwards the link request will store a *link id* in it’s *link table* , along with the
     amount of hops the packet had taken when received. The link id is a hash of the entire link
-    request packet. If the path is not *proven* within some set amount of time, the entry will be
-    dropped from the *link table* again.
+    request packet. If the link request packet is not *proven* by the addressed destination within some
+    set amount of time, the entry will be dropped from the *link table* again.
 
-* | When the destination receives the link request packet, it will decrypt it and decide whether to
-    accept the request. If it is accepted, the destination will also generate a new X25519 private/public
-    key pair, and perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used
-    to encrypt the channel, once it has been established.
+* | When the destination receives the link request packet, it will decide whether to accept the request.
+    If it is accepted, the destination will also generate a new X25519 private/public key pair, and
+    perform a Diffie Hellman Key Exchange, deriving a new symmetric key that will be used to encrypt the
+    channel, once it has been established.
 
 * | A *link proof* packet is now constructed and transmitted over the network. This packet is
     addressed to the *link id* of the *link*. It contains the following data: The newly generated X25519
-    public key *LKr* and an RSA-1024 signature of the *link id* and *LKr*.
+    public key *LKr* and an Ed25519 signature of the *link id* and *LKr* made by the signing key of
+    the addressed destination.
    
 * | By verifying this *link proof* packet, all nodes that originally transported the *link request*
     packet to the destination from the originator can now verify that the intended destination received
@@ -556,6 +601,8 @@ the light of Reticulums goal of equal access, doing so would need to be the subj
 investigation of the consequences first.
 
 
+.. _understanding-packetformat:
+
 Binary Packet Format
 --------------------
 
@@ -651,8 +698,8 @@ Binary Packet Format
      wire size including all fields.
 
      - Path Request    :    33  bytes
-     - Announce        :    323 bytes
-     - Link Request    :    141 bytes
-     - Link Proof      :    205 bytes
-     - Link RTT packet :    86  bytes
+     - Announce        :    151 bytes
+     - Link Request    :    77  bytes
+     - Link Proof      :    77  bytes
+     - Link RTT packet :    83  bytes
      - Link keepalive  :    14  bytes

docs/source/whatis.rst

@@ -2,7 +2,9 @@
 What is Reticulum?
 ******************
 
-Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth. Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.
+Reticulum is a cryptography-based networking stack for wide-area networks built on readily available hardware, and can operate even with very high latency and extremely low bandwidth.
+
+Reticulum allows you to build very wide-area networks with off-the-shelf tools, and offers end-to-end encryption, autoconfiguring cryptographically backed multi-hop transport, efficient addressing, unforgeable packet acknowledgements and more.
 
 Reticulum is a complete networking stack, and does not use IP or higher layers, although it is easy to utilise IP (with TCP or UDP) as the underlying carrier for Reticulum. It is therefore trivial to tunnel Reticulum over the Internet or private IP networks. Reticulum is built directly on cryptographic principles, allowing resilience and stable functionality in open and trustless networks.
 
@@ -25,11 +27,11 @@ What does Reticulum Offer?
 
 * Fully self-configuring multi-hop routing
 
-* Asymmetric RSA encryption and signatures as basis for all communication
+* Asymmetric X25519 encryption and Ed25519 signatures as a basis for all communication
 
-* Perfect Forward Secrecy on links with ephemereal Elliptic Curve Diffie-Hellman keys (on Curve25519)
+* Forward Secrecy with ephemereal Elliptic Curve Diffie-Hellman keys on Curve25519
 
-* Reticulum uses the Fernet specification for encryption on links and to group destinations
+* Reticulum uses the `Fernet <https://github.com/fernet/spec/blob/master/Spec.md>`_ specification for encryption
 
   * AES-128 in CBC mode with PKCS7 padding
 
@@ -37,11 +39,13 @@ What does Reticulum Offer?
 
   * IVs are generated through os.urandom()
 
+  * Keys are ephemeral and derived from an ECDH key exchange on Curve25519
+
 * Unforgeable packet delivery confirmations
 
 * A variety of supported interface types
 
-* An intuitive and easy-to-use API
+* An intuitive and developer-friendly API
 
 * Reliable and efficient transfer of arbritrary amounts of data
 
@@ -51,10 +55,16 @@ What does Reticulum Offer?
 
   * The API is very easy to use, and provides transfer progress
 
+* Efficient link establishment
+
+  * Total bandwidth cost of setting up a link is only 3 packets, totalling 237 bytes
+
+  * Low cost of keeping links open at only 0.62 bits per second
+
 
 Where can Reticulum be Used?
 ============================
-On practically any hardware that can support at least a half-duplex channel
+Over practically any medium that can support at least a half-duplex channel
 with 1.000 bits per second throughput, and an MTU of 500 bytes. Data radios,
 modems, LoRa radios, serial lines, AX.25 TNCs, amateur radio digital modes,
 ad-hoc WiFi, free-space optical links and similar systems are all examples

setup.py

@@ -1,11 +1,13 @@
 import setuptools
 
+exec(open("RNS/_version.py", "r").read())
+
 with open("README.md", "r") as fh:
     long_description = fh.read()
 
 setuptools.setup(
     name="rns",
-    version="0.2.0",
+    version=__version__,
     author="Mark Qvist",
     author_email="mark@unsigned.io",
     description="Self-configuring, encrypted and resilient mesh networking stack for LoRa, packet radio, WiFi and everything in between",
@@ -18,6 +20,6 @@ setuptools.setup(
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
-    install_requires=['cryptography>=3.4.7', 'pyserial'],
-    python_requires='>=3.5',
-)
+    install_requires=['cryptography>=3.4.7', 'pyserial', 'netifaces>=0.10.4'],
+    python_requires='>=3.6',
+)