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  1. OASIS Message Queuing Telemetry Transport (MQTT) TC
  2. MQTT-539

TopicId in PUBACK is superfluous

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    Details

    • Type: Improvement
    • Status: Applied
    • Priority: Trivial
    • Resolution: Fixed
    • Affects Version/s: MQTT-SN-1.2
    • Fix Version/s: None
    • Component/s: MQTT-SN
    • Labels:
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    • Proposal:
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      In section 5.4.13 remove the TopicId field from table 17 and from the list of fields below.

      MsgId becomes bytes 2 and 3

      ReturnCode becomes byte 4

       

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      In section 5.4.13 remove the TopicId field from table 17 and from the list of fields below. MsgId becomes bytes 2 and 3 ReturnCode becomes byte 4  
    • Resolution:
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      Added proposal to draft.

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      Added proposal to draft.

      Description

      Via Tomoaki Yamaguchi.  "The topicId in the PUBACK packet makes the gateway implementation complicated.  The msgId in PUBACK is enough for the client to handle the response."

      This also makes the PUBACK different to the PUBREC, PUBREL and PUBCOMP.  Perhaps this was for the purpose of reporting errors as these three acks also lack a return code field (which will be dealt with in another issue).

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            • Assignee:
              ian.craggs Ian Craggs
              Reporter:
              ian.craggs Ian Craggs
            • Watchers:
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              • Created:
                Updated:
                Resolved: