[OASIS Issue Tracker] (MQTT-599) In ASLEEP state also a PUBLISH-1 should trigger the sending of the pending messages on the subscribed topics

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    [ https://issues.oasis-open.org/browse/MQTT-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=82417#comment-82417 ] 

Simon Johnson commented on MQTT-599:
------------------------------------

Hi Davide,

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If the client wishes to receive messages whilst in the sleeping state, this is achieved by issuing a PINGREQ packet bounded by a PINGRESP packet. Receiving messages whilst not in the AWAKE state essentially means there is no distinct between ASLEEP state and AWAKE state this meaning it is obsolete (as I understand your proposal). The sleep state has shown itself (in my experience with the protocol) to be a very powerful feature, giving the devices fine grained control over their presence on the network.

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Please can you clarify why devices simply wouldn't issue a PINGREQ to achieve the desired functionality?

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> In ASLEEP state also a PUBLISH-1 should trigger the sending of the pending messages on the subscribed topics
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: MQTT-599
>                 URL: https://issues.oasis-open.org/browse/MQTT-599
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: MQTT-SN
>            Reporter: Davide Lenzarini
>            Priority: Major
>
> In ASLEEP state also a PUBLISH-1 should trigger the sending of the pending messages on the subscribed topics terminating with a PINGRESPÂ
> The scenario that I have in mind is the following:
>  # 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 toÂ
> Â
> Â



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