Serial interface implemented

FPE/Packet.py

@@ -0,0 +1,35 @@
+import struct
+from Transport import *
+
+class Packet:
+
+	def __init__(self, destination, data):
+		self.destination = destination
+		self.data   = data
+		self.flags  = 0x00
+		self.header = 0x00
+		self.raw	= None
+		self.sent   = False
+		self.mtu    = 0
+
+	def send(self):
+		if not self.sent:
+			self.MTU = self.destination.MTU
+			self.header =  struct.pack("!B", self.header ^ self.destination.type ^ self.flags)
+			self.header += self.destination.hash
+			self.ciphertext = self.destination.encrypt(self.data)
+			self.raw = self.header + self.ciphertext
+
+			if len(self.raw) > self.MTU:
+				raise IOError("Packet size exceeds MTU of "+Packet.MTU+" bytes")
+
+			Transport.outbound(self.raw)
+			self.sent = True
+		else:
+			raise IOError("Packet was already sent")
+
+	def resend(self):
+		if self.sent:
+			Transport.outbound(self.raw)
+		else:
+			raise IOError("Packet was not sent yet")