I wrote a bridge between signald and prosody (without spectrum) so I can use xmpp clients with signal. Async python, only non-standard library dependency is slixmpp. It's working well.
I've seen your project! Congrats, it is very nice.
I stopped fiddling with transports because signald doesn't compile/run on freebsd (some of the java libs behind it rely on native libs which have problems compiling), and for now I've put it aside.
