This blog post contains a summary of the Github project here:
The OpenUI5 data model uses a node on an XMPP server to synchronize itself to different connected clients. Because of the usage of CRDT (Conflict-free replicated data type) it is easy to build offline capabilities on top of it.
The XMPP server requires the following:
- PubSub Support (XEP-0060)
- WebSocket (RFC 7395)
- Anonymous access and node creation capabilities
In our developement we used ejabbered running on Ubuntu 16.04.
The communication with the client uses a WebSocket connection to the XMPP server but every other client can connect via normal sockets using port 5222.
For a good overview I would recommend the following video:
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