[OASIS Issue Tracker] (MQTT-498) No way to set properties on will message

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    [ https://issues.oasis-open.org/browse/MQTT-498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=67486#comment-67486 ] 

Ken Borgendale commented on MQTT-498:
-------------------------------------

I think it would be best to create a separate issue for the expiry of retained messages.

I would say that the current text would mean that the time basis for the expiry of a message is the PUBLISH time and this is orthogonal to whether the RETAIN bit is set.  Allowing a retained message to expire is very useful for cleaning up server resources, and is also useful from a publisher point of view in that if the retained message is too old it might not be meaningful.

> No way to set properties on will message
> ----------------------------------------
>
>                 Key: MQTT-498
>                 URL: https://issues.oasis-open.org/browse/MQTT-498
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5, CSD01
>            Reporter: Ian Craggs
>
> There is no way to set properties on the will message. This may have been discussed but on implementation it seems like a significant omission and asymmetry. Content type and payload format, are two examples of properties which would be very useful. 
> The behaviour of properties on retained messages appears to be unspecified. It could be interpreted that properties are not stored nor propagated, but that seems unlikely to be desirable. In the event of propagation, the behaviour of some properties such as the publication expiry interval, should be clarified. I suggest that the "time of receipt" for a retained message should be the time of receipt of the subscribe request which triggers it.



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