This blog post contains a summary of the Github project here:

https://github.com/ManuelB/XMPPJSONPatchSyncModel

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:

 

Screenshot

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