Well, yes, most important is I think do_relay which makes direct raw binary channel to the pebble.

There's also cloudpebble part which makes the same but via external wss proxy, but we need some insight from Kath probably to find out how to make it properly from the phone perspective (need to register itself as an endpoint somehow I presume).

Also I've found a repo on merproject hosting qt5-qtwebsocket rpm built for jolla, which allows greatly simplify at least the build. Just built websocket branch with it.
Edit: I forgot openrepos is also an rpm repo so that also could be used with coderus build