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Re:Show HN: Beeper – All Your Chats in One App by dijit on Thursday January 21, 2021 @04:44AM (#25857161)
The solution was nearly always to create golden packages which could be summarised.

XMPP v1 server could be just XMPP itself.

A v2 client/server includes packages for OMEMO, Websocket, Resumeable connections

A v3 client/server has packages for whatever else becomes the de jour.

The idea that you can just mix and match without ever standardising on a set of capabilities was a large part of what killed XMPP and was entirely solvable.

Re:Show HN: Beeper – All Your Chats in One App by MattJ100 on Thursday January 21, 2021 @05:20AM (#25857394)
This is what happens. Compliance suites are published annually: https://xmpp.org/about/compliance-suites.html
Re:Show HN: Beeper – All Your Chats in One App by Semaphor on Thursday January 21, 2021 @01:52PM (#25862523)
This is either barely getting used or not used enough (or maybe too hidden). Because I had only seen single XEP lists for both clients and servers I looked at.