Objects (;) and items ()) were identified but position data was never
extracted, causing them to appear without location on the map. Added
parse_object() and parse_item() functions to properly extract name,
status, and coordinates.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Backend changes (routes/aprs.py):
- Remove -q h flag from direwolf to enable audio level output
- Add parse_audio_level() to extract levels from direwolf output
- Add rate-limiting (max 10 updates/sec, min 2-level change)
- Push meter events to SSE queue as type='meter'
Frontend changes:
- Add signal meter widget to APRS sidebar
- Horizontal bar gauge with gradient (green->cyan->yellow->red)
- Numeric level display (0-100)
- "BURST" indicator for levels >70
- Status text (weak/moderate/strong signal)
- "No RF activity" state after 5 seconds of silence
- CSS styles in static/css/modes/aprs.css
Also added UK region to dropdown (same freq as Europe: 144.800)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Major improvements to APRS decoding reliability:
Process piping fixes (prevent deadlocks):
- rtl_fm stderr -> DEVNULL (was blocking on unbuffered stderr)
- decoder stderr -> STDOUT (merged, single stream to read)
- decoder uses text=True, bufsize=1 for line-buffered reading
- Proper EOF detection in stream thread
rtl_fm command improvements:
- Use -M nfm (narrowband FM) for APRS
- Add -E dc (DC blocking filter) for cleaner audio
- Add -A fast (fast AGC) for packet bursts
- Sample rate 22050 Hz matches direwolf -r 22050
Parsing robustness:
- Strip direwolf bracket prefixes like "[0.4] " before parsing
- Handle multimon-ng "AFSK1200:" prefix
- Better error handling for early process exit
New /aprs/spectrum endpoint:
- Runs rtl_power to scan around APRS frequency
- Returns peak detection, noise floor, signal analysis
- Provides advice for antenna/signal debugging
- Supports region selection and custom frequency
Also added UK to region list (same freq as Europe: 144.800 MHz)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Direwolf requires a config file to run. Create a minimal receive-only
config at startup that configures stdin input with AFSK1200 modem.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Changed -q d to -q h flag. The -q d option was suppressing APRS packet
descriptions (the decoded output we need), while -q h only suppresses
the audio level heard line.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Change direwolf flags from -D 1 to correct flags for stdin input
- Add -n 1 (mono), -b 16 (16-bit), -t 0 (no PTT), -q d (quiet)
- Add -M fm for explicit FM demodulation in rtl_fm
- Add explicit stdout output (-) to rtl_fm command
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Create routes/aprs.py with start/stop/stream endpoints for APRS decoding
- Support multiple regional frequencies (North America, Europe, Australia, etc.)
- Use direwolf (preferred) or multimon-ng as AFSK1200 decoder
- Parse APRS packets for position, weather, messages, and telemetry
- Add APRS visualization panel with Leaflet map and station tracking
- Include station list with callsigns, distance, and last heard time
- Add packet log with raw APRS data display
- Register APRS blueprint and add global state management
- Add direwolf and multimon-ng to dependency definitions
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
