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Python Multimon APRS

Project description

pymma is an RF to APRS-IS gateway supporting several backends:

  • Pulseaudio
  • ALSA
  • HackRF (via Soapy)

You can inject frames directly from RF (SDR), or from an audio source (ALSA).

pymma vs. pymultimonaprs

pymma is derived from Dominik Heidler’s work on

Credit for the majority of the work on pymma goes to @asdil12, et al. pymma is intended as a fork from pymultimonaprs. While I plan to match capabilities and contribute back to the pymultimonaprs project, pymma will vary in several aspects.

Every intention has been made to credit Dominik throughout this code, and to maintain and uphold GPL (to the best of my understanding).

It goes without saying that @asdil12 did most of the heavy lifting :).


  • 1.3.x will be the last branch to support Python 2.7.x.
  • 2.x will support Python 3.6.x only.


  • Install multimon-ng
  • Install rtl-sdr or soapy (for RTL-SDR backend)
  • Run make install


Edit /etc/pymma.json


Set the source to rtl, alsa, or pulse to select the backend


Set the status text, or set a status file - the content of this file will be read at runtime and sent as status. This way you can eg. monitor your battery status using APRS-IG. Set both text and file to false to disable status beacon.

Position Ambiguity

To hide your exact position you can set the ambiguity value to a value from 0 to 4. - 0 will not hide anything - 1 will decrease precision to 1/10 of a min - 2 will decrease precision to 1 min - 3 will decrease precision to 10 min - 4 will decrease precision to 1°


You can set weather to a json-file. eg: “weather”: “/path/to/weather.json”, If you don’t want do send weather date, just leave it on false. This will be read in like the status-file and can look like that:

    "timestamp": 1366148418,
    "wind": {
            "speed": 10,
            "direction": 240,
            "gust": 200
    "temperature": 18.5,
    "rain": {
            "rainlast1h": 10,
            "rainlast24h": 20,
            "rainmidnight": 15
    "humidity": 20,
    "pressure": 1013.25


  • timestamp is seconds since epoch - must be included
  • wind
    • speed is in km/h
    • direction is in deg
    • gust is in km/h
  • temperature is in °C
  • rain
    • rainlast1h is in mm
    • rainlast24h is in mm
    • rainmidnight is in mm
  • humidity is in %
  • pressure is in hPa

The timestamp must be included - everything else is optional.


The correct symbol is already selected. If you still want to change it, you can find the symbol table [here](

IPv4 / IPv6

To select a protocol you can set preferred_protocol to ipv4, ipv6 or any. You use a raw IPv6 address as a gateway like this: “[2000::1234]:14580”.


  • It is recommended you run pymma with supervisor or systemd.
  • Run systemctl start pymma or just pymma -v for testing.


Greg Albrecht W2GMD <>


GNU General Public License, Version 3

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