So far I've found this post from 2010 by Paolo D'Incau:
It uses
1. What is a modern alternative to exmpp library for writing an external component?
2. Could you, please, provide a very basic ("hello world") component usage example (like it was done by Paolo D'Incau).
3. How to expose component via service discovery in Gajim (or other client) on a (localhost) server? (
Thank you for your support,
Ilya.