Hotspot local coms flakey
I tried turning off mobile data and wifi router then turned on android hotspot for two other devices with briar beta to connect to, so three in all. The host device could see one acccount active, but not the other. The two users could see eachother, one user couldn't see the host account. It seems the devices aren't reliably seeing eachother.
Also as another related issue, none of the bluetooth links worked for chats at all without wifi, even though they were paired. I think the manual needs more detail on how to get this to work.