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Previously we preferred XMPP because there was a concern that the WebSockets API might change or go away, however since the product line has been discontinued there is much less risk of a firmware update breaking the WebSockets. Since the WebSocket version is more stable, and does not have the blocking I/O issues that XMPP does, its generally a better choice to try first. Additionally the XMPP implementation used on the hub has known vulns.
In theory we should never fallback to XMPP with this change even if its enabled unless the WebSocket port is blocked