I don't know if you will see this, or if you're using the "royal we", but if there's anything i can do to test using ultra-low bandwidth matrix over packet/PACTOR radio on HF; i'd be very interested.

Unfortunately, none of it can be encrypted (not with my license, at least) - but for sending telemetry or simple "i'm still alive" messages i think it would be pretty cool. Not having to write custom tooling off ham radio "tools" like fldigi, but rather have a bot sitting somewhere else monitoring the channel seems like a huge, huge win.

we = matrix core team. totally understood that crypto is not an option, which is arguably good news for ultra low bandwidth: compresses better and no aead headers :)

there should be another round of work on this fairly soon driven by our p2p work - #p2p:matrix.org is probably the best place to follow along, likewise arewep2pyet.com