[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=33583#action_33583 ] 

Raphael Cohen commented on MQTT-19:
-----------------------------------

I'd second that the zero length payload is sent on to clients, and that is clarified in the spec. This makes it trivial for a client, as well as a broker, to know that a retained subscription has been deleted. It also means that brokers being retrofitted with MQTT can degrade more gracefully if they can't support retained subscriptions (by simply passing through messages) or retained subscription deletion.



> 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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