[OASIS Issue Tracker] (MQTT-471) Topic Alias and QoS 0

Brian Raymor created MQTT-471:
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             Summary: Topic Alias and QoS 0
                 Key: MQTT-471
                 URL: https://issues.oasis-open.org/browse/MQTT-471
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: edits
    Affects Versions: 5, wd14
            Reporter: Konstantin Dotchkoff
            Priority: Minor
             Fix For: 5, wd14


This issue was originally reported in MQTT-417, but doesn't seem to be addressed in WD14. 

Lines 1860-1862

"If a Topic Alias mapping has been set at the receiver, a sender can send a PUBLISH packet that contains that Topic Alias and a zero length Topic Name. The receiver then treats the incoming PUBLISH as if it had contained the Topic Name of the Topic Alias."

How does the sender knows whether a topic alias mapping has been set at the receiver if the message is QoS 0?




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