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Subject: [OASIS Issue Tracker] (MQTT-541) Cleansession should act like MQTT 5.0 not 3.1.1


Ian Craggs created MQTT-541:
-------------------------------

             Summary: Cleansession should act like MQTT 5.0 not 3.1.1
                 Key: MQTT-541
                 URL: https://issues.oasis-open.org/browse/MQTT-541
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: MQTT-SN
    Affects Versions: MQTT-SN-1.2
            Reporter: Ian Craggs


The *clean session flag* operates in a similar manner to MQTT 3.1.1 in that the cleanup operates at both the start and end of the session. In MQTT 5.0, the clean session flag becomes the clean start flag, and a separate property _session expiry_ dictates when the session state is removed on the server. The MQTT 5.0 facilities are much more flexible and I would advocate changing MQTT-SN to match. One way to achieve this would be to add a session expiry 2 byte integer field (matching the _duration_ field) to the CONNECT packet.



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