Other than the Briar Project, I know of nothing that addresses handset to handset direct comms. And no one I know is even vaguely interested in it and few, other than activisty tech types, even think the idea has value.
It's maddening. castoff phones on thrift stores, wifi only even, no sim, have more computing power than most people had in 1990. And no interest in them except as commodity platforms for whatever it is we do.
@tomjennings The totally weird thing is that Apple implemented such a thing with Airdrop. It was used in the Hong Kong protests to distribute warnings and calls for demonstrations. Ultimately Apple had to change its implementation after pressure by the Chinese government. @simon