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Subject: [OASIS Issue Tracker] (MQTT-600) A Gateway should buffer Q0S 0 messages for ASLEEP clients
[ https://issues.oasis-open.org/browse/MQTT-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=82427#comment-82427 ] Simon Johnson commented on MQTT-600: ------------------------------------ Yup, I think I understand your proposal - let me add this to the agenda for discussion. > 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) -- This message was sent by Atlassian Jira (v8.3.3#803004)
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