[OASIS Issue Tracker] (MQTT-506) Session Expiry in CONNACK

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     [ https://issues.oasis-open.org/browse/MQTT-506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ken Borgendale updated MQTT-506:
--------------------------------

         Assignee: Ken Borgendale
    Fix Version/s: 5
                   wd16

This was discussed at the 2017-09-28 MQTT TC.  The decision was to add a property to return the granted  session expiry interval from server ot client on a CONNACK.  This is meant to inform the client in cases where the server by administrative action  is unwilling to use the session expiry interval requested by the client.

Since the server can delete a stored session for other administrative reasons, returning this value does not indicate that the server will not delete the session until the specified interval has elapsed.

> Session Expiry in CONNACK
> -------------------------
>
>                 Key: MQTT-506
>                 URL: https://issues.oasis-open.org/browse/MQTT-506
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 5, CSD01
>            Reporter: Dominik Obermaier
>            Assignee: Ken Borgendale
>             Fix For: 5, wd16
>
>
> The Session Expiry Interval Property (0x11) can only be present in the CONNECT and DISCONNECT header.
> For clients connecting to a MQTT broker it may be a useful information how long the session expiry interval is, especially if an administrative session expiry interval was configured on the broker and the client is not aware of it.
> Also, if a client sets a session expiry interval in the CONNECT message, it may be overridden by the broker implementation. Currently there is no way to notify the client of his "new" session expiry interval.
> So the proposal is to add the Session Expiry Interval Property as valid property for the CONACK packet.



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