APRS IGate
==========

I run a lightweight :doc:`../modes/aprs` IGate as ``2E0KGG-10`` (https://aprs.fi/info/a/2E0KGG-10)
routing APRS between RF and internet.

Currently it's a lightweight setup with no transmit capability,
only receiving on 2m.


Hardware
--------

* Raspberry Pi 3B+
    * It would happily run on something lighter but this is what I had spare
* Nooelec NESDR SMART v4 https://www.nooelec.com/store/nesdr-smart.html
    * Any RTL-SDR device would probably work here, again, a spare
* Antenna
    * Currently I'm using the little whip that came with the NESDR but it doesn't hear much indoors


Software
--------

I started from the Direwolf guide: https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf

`Raspberry Pi OS Bullseye <https://www.raspberrypi.com/software/operating-systems/>`_
makes setup much more straightforward as things mostly work out of the box - no DIY compilation or module blacklisting necessary.

Direwolf configuration:

.. code-block::

    MYCALL XXXXX

    IGSERVER euro.aprs2.net

    # https://apps.magicbug.co.uk/passcode/
    IGLOGIN XXXXX XXXXX

    # http://www.aprs.org/symbols/symbols-new.txt
    # R& = Receive only IGate (do not send msgs back to RF)
    PBEACON delay=1 every=30 sendto=IG symbol=R& lat=XXX long=YYY via=WIDE1-1,WIDE2-1 

Running:

.. code-block::

    # Basic
    rtl_fm -f 144.8M - | direwolf -c sdr.conf -r 24000 -t 0 -

    # Debug all the things
    # (Unfortunately direwolf doesn't support verbose long-opts,
    # but the docs describe the various options - I never remember)
    rtl_fm -f 144.8M - | direwolf -c sdr.conf -r 24000 -t 0 -dk -dn -du -dx -di -dp -df -dw -dm -dp -