The project is really interesting and I think I am going to try it.
It looks like it's text only? would it be possible to add a very filtered, low-bandwidth audio stream since the phone can do all the calculations?
I have no idea on the actual bandwidth of these devices, wikipedia says LoRa is 0.3-27 Kb/s and Opus should work decently at ~10Kb/s I think. So maybe?
Although audio would probably be half duplex and only point-to-point instead of mesh, but it still could be interesting
Codec2 is part of it but you need a lot more pieces on top(framing, modulation, etc). LoRA doesn't really have the bandwidth for Codec2(for a few reasons, mostly power and the way LoRA handles channel congestion).
M17[1] has been making really big strides in this space and really excited to start seeing a proper open hardware/open source digital radio stack.
Another thing to consider would be latency due to retransmissions. Something like voice notes would probably be better than a live call send it could be re-transmitted as many times as necessary and broken into small chunks.
It looks like it's text only? would it be possible to add a very filtered, low-bandwidth audio stream since the phone can do all the calculations?
I have no idea on the actual bandwidth of these devices, wikipedia says LoRa is 0.3-27 Kb/s and Opus should work decently at ~10Kb/s I think. So maybe?
Although audio would probably be half duplex and only point-to-point instead of mesh, but it still could be interesting