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  1. OASIS Message Queuing Telemetry Transport (MQTT) TC
  2. MQTT-59

How are duplicate SUBSCRIBEs handled?

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 3.1.1
    • Fix Version/s: 3.1.1
    • Component/s: core
    • Labels:
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    • Proposal:
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      Add to subscribe response 3.8.4 line 996 WD12

      A subscribe request, which contains a topic filter that is identical to an existing topic filter
      completely replaces the existing subscription using the new requested maximum Qos values.
      Any existing retained publications matching the topic filter, are resent.
      The flow of publications is not interrupted.

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      Add to subscribe response 3.8.4 line 996 WD12 A subscribe request, which contains a topic filter that is identical to an existing topic filter completely replaces the existing subscription using the new requested maximum Qos values. Any existing retained publications matching the topic filter, are resent. The flow of publications is not interrupted.

      Description

      This issue is related to MQTT-58

      If a client has a subscription to a topic and then issues a SUBSCRIBE to the same topic does it have two subscriptions (and depending on MQTT-58 receive two copies of each message) or just one? If the latter case do the values of the new SUBSCRIBE (such as QoS) replace those of the original subscription?

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            • Assignee:
              andrew_banks Andrew Banks (Inactive)
              Reporter:
              al.s-m Allan Stockdill-Mander (Inactive)
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              • Created:
                Updated:
                Resolved: