not sure what you mean by websockets but the tcp server can announce stuff like the old httpapi could, i.e. playback stopped and such.
I've also added so a client can announce stuff aswell, so 2 clients can in theory communicate through this, however the communication is easily eavesdropped by a third client
I mostly added it so a script could listen to events and report stuff, a reasonable usage scenario is the social aspect were a script could report love status and such, and since scripts can announce a backend script could easily announce "download finished" and so on.
If there exist interest I'll add a real messaging system which can't be eavesdropped (well with wireshark it could, I doubt I'll add encryption, seems abit more like the clients doing but could be pursuaded to do add though).
P.S Glad to see you got it working.