[OASIS Issue Tracker] (MQTT-508) The default for session expiry should be 0, not never

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Ian Craggs created MQTT-508:
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             Summary: The default for session expiry should be 0, not never
                 Key: MQTT-508
                 URL: https://issues.oasis-open.org/browse/MQTT-508
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: core
    Affects Versions: 5, CSD01
            Reporter: Ian Craggs
            Priority: Minor
             Fix For: 5


If no session expiry property is included in the connect packet, then the default is assumed to be no expiry.  This could lead to applications unintentionally leaving client state on the server and never cleaning up.  This was the reason that the clean start flag was changed to clean session for later versions of MQTT.

I think that it should be an effort for the application to leave session state lying around, rather than it being the easiest option.  In that vein, the default if no session expiry is included should be 0, not infinite. 

This does pose the question of whether there should be a special value to indicate no expiry, other than max int.  But that may not be crucial or necessary. 



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