I would suggest using SASL-ANONYMOUS for logging into the local xmpp servers which provides an easy way to establish your xmpp client connections, and then layer the identity of the vehicle on top using your own extension (maybe digital certs/sigs?), and then communicate via the xmpp connection with the lessor and lesse central xmpp systems and transmitting either signed xmpp messages or provide the capability of the central xmpp server to query the vehicles identity itself once communication has been established (disco?).

Richard


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