[OASIS Issue Tracker] (MQTT-498) No way to set properties on will message. Property behaviour on retained messages unspecified

Ian Craggs created MQTT-498:
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             Summary: No way to set properties on will message. Property behaviour on retained messages unspecified
                 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: wd15
            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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