I started to compile a list of sendxmpp alternatives there: https://wiki.xmpp.org/web/User:MDosch/Sendxmpp_incarnationsXmppc is already in debian testing so it'll probably be included in bullseye.
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- Bug#986971: sendxmpp: Sendxmpp doesn't work with current XMPP... Martin Dosch
- Bug#986971: Info Martin Dosch
