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Subject: [OASIS Issue Tracker] Updated: (MQTT-74) What should happen to messages pending delivery once the client sends unsubscribe?
[ http://tools.oasis-open.org/issues/browse/MQTT-74?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Banks updated MQTT-74:
-----------------------------
Proposal:
In WD13 line 1097 Unsubscribe response add:
Stop adding any new messages for delivery to the client then send an UNSUBACK packet.
The server MUST complete the delivery of any int QoS 1 or QoS 2 messages which it has started to send to the client.
The server MAY continue to process any existing messages queued for delivery to the client.
> What should happen to messages pending delivery once the client sends unsubscribe?
> ----------------------------------------------------------------------------------
>
> Key: MQTT-74
> URL: http://tools.oasis-open.org/issues/browse/MQTT-74
> Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
> Issue Type: Improvement
> Components: core
> Affects Versions: 3.1.1
> Reporter: Richard Coppen
> Fix For: 3.1.1
>
>
> A client might be too busy to process any more work, so sends UNSUBSCRIBE to turn the flow off.
> Alternatively, the client may be unaware that a backlog of messages exists and sends UNSUBSCRIBE.
> There are at lesat three possible options:
> 1. The server delays sending the UNSUBACK until the backlog is cleared
> 2. Send the UNSUBACK and then send the messages
> 3. Send the UNSUBACK and then purge the messages
> The client's last defense should it not want the messages is to disconnect and reconnect with cleanSession set to (1)
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