[OASIS Issue Tracker] Commented: (MQTT-19) How Retained publications are deleted.

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    [ http://tools.oasis-open.org/issues/browse/MQTT-19?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33580#action_33580 ] 

Dominik Obermaier commented on MQTT-19:
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I think this behaviour should not be optional but instead it should be mandatory. This is the only chance for a client to delete a retained message. When this behaviour would be removed from the specification, it is impossible to implement a scenario where a "last good message" could be deleted by clients.

Afaik most brokers implement the behaviour of deleting a retained publish when sending a zero byte payload message with the retained flag set and there are probably several projects out there which rely on this feature.


> How Retained publications are deleted.
> --------------------------------------
>
>                 Key: MQTT-19
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-19
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>            Reporter: Andrew Banks
>
> There specification suggests that a retained message published with a zero byte payload can be used to cause a retained message to be deleted by the server, although it
> leaves this behavior as optional. It is not clear whether the zero length message should be sent to subscribers.

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