[OASIS Issue Tracker] (MQTT-600) A Gateway should buffer Q0S 0 messages for ASLEEP clients

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/MQTT-600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Johnson updated MQTT-600:
-------------------------------
    Component/s: MQTT-SN

> A Gateway should buffer Q0S 0 messages for ASLEEP clients
> ---------------------------------------------------------
>
>                 Key: MQTT-600
>                 URL: https://issues.oasis-open.org/browse/MQTT-600
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: MQTT-SN
>            Reporter: Davide Lenzarini
>            Priority: Major
>
> Chapter 3.19 (Sleeping clients) of WD24
> _During the asleep state, packets that need to be sent to the client are buffered at the server/gateway. The gateway MUST buffer application messages of quality-of-service 1 & 2._
> _Non-normative comment_
> _The gateway may choose to buffer messages of all quality-of-service 0, whilst the client is sleeping and is within it's session expiry interval._
> Â
> I propose to modify the above in
> _During the asleep state, packets that need to be sent to the client are buffered at the server/gateway. The gateway MUST buffer application messages of quality-of-service 1 & 2 *{color:#FF0000}& 0{color}*._
> -_Non-normative comment_-
> -_The gateway may choose to buffer messages of all quality-of-service 0, whilst the client is sleeping and is within it's session expiry interval._-
> Â
> With this modification the following scenario is possible:ÂÂ
>  # A client CONNECT to a gateway (client enrollment) with a very long session expiry interval
>  # The client subscribe to a certain topic to receive pending messages as soon as it sends a publish-1 message to a certain (also different) topic
>  # The client DISCONNECTÂwith a very long session expiry interval
>  # After some time the client send a PUBLISH-1 message and would like to receive (like with the PINGREQ when in ASLEEP state) all pending messages on the topic it has subscribed to, also with QoS 0 (the most efficient as they don't require any acknowledge)



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