Hi,
I made some more progress working on my application[1].
First of all, it is now possible to run it headless (maybe even daemonized)
and control it remotely using a telnet client.
Second, I have added support for mixed mode repeater (Codec2/FM or
viceversa or any combination of modes like wideband Opus/Codec2/FreeDV/SSB
etc.).

The repeater can be connected to a VOIP server using the low latency Mumble
voice protocol (known especially for high-performance gaming). So it is
possible now to connect multiple repeaters together by putting them on the
same VOIP channel (this can be controlled via telnet as well, although it's
stil work in progress). They operate in full duplex mode, so a VOIP user
can talk at the same time as a radio user and the two audio streams will be
mixed together and broadcast. The FreeDV/Codec2 radio frames are transcoded
to Opus at very high bitrates (~48 kbit/s) for VOIP transport. This may
cause some small delays.

I haven't really had time to test the cross-mode repeater so could use some
help there from interested parties.

[1] http://qradiolink.org

Cheers,
Adrian
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