I’ve set up WordPress and right now I’m looking for a way to automatically add WP users to Synapse and send them instructions about how to access via web, mobile, or desktop client.
I thought that is already supposed to be covered by creating freedombox accounts, and the freedombox portal already provides info and links to the client apps. But of course the instructions may be improvable. If you have specific ideas the freedombox devs may be able to point you to the corresponding html and code.
Generally, the matrix stack on freedombox should work. However, from what I read and found about its privacy it’s seems to implement “decentral operation with central meta-data routing (i.e. collection)”. Probably what is to be expected from financial and company interests. (Ask yourself who would invest.) It’s the matrix vs. grid vs. XMPP protocol topic.
The XMPP stack on freedombox currently still needs some manual workarounds to support audio and video calls:
I read that for XMPP on iOS at least Siskin does support audo and video chat, but may still be missing some file based audio/video file recording and sending features.
Fully featured mobile XMPP clients for android, lineage or https://e.foundation are https://Conversations.im and https://Quicksy.im for contacts that are not on any self-hosted server.
https://movim.eu may be used as a full-featured web-based XMPP chat client.
Jitsi may also be an alternative for XMPP conferencing, it has upstream debian packages and a generic howto:
Concerning LDAP account integration: Though I really do not understand this page fully, this seems like it is showing an install and configuration of jitsi with LDAP accounts. anwenderwiki:erweiterungen:jitsi [CommunityWiki]
For some one-to-many conference features, however, it may still be necessary to have an installation of “big blue button”.