Edit: Found it:
https://github.com/ortuman/jackal#supported-specifications
Ejabberd in comparison: https://www.process-one.net/en/ejabberd/protocols/
It’s crazy how much stuff a mature xmpp server can do out of the box.
Incidentally, that one is missing from jackal's list. I wonder if that means that you can't set or see users' nicknames when using it?
* https://xmpp.org/extensions/xep-0172.html
Incidentally, that one is missing from jackal's list. I wonder if that means that you can't set or see users' nicknames when using it?