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  1. OASIS Message Queuing Telemetry Transport (MQTT) TC
  2. MQTT-204

Make $ topic separation normative

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: core
    • Labels:
      None
    • Proposal:
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      replace text under 4.7.2 with:

      The Server MUST NOT match Topic Filters starting with a wildcard character (# or +) with Topic Names beginning with a $ character. The Server SHOULD prevent Clients from using such Topic Names to exchange messages with other Clients. Server implementations MAY use Topic Names that start with a leading $ character for other purposes.

      remove 4.7.2.1, retaining the non-normative comments from both sections.

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      replace text under 4.7.2 with: The Server MUST NOT match Topic Filters starting with a wildcard character (# or +) with Topic Names beginning with a $ character. The Server SHOULD prevent Clients from using such Topic Names to exchange messages with other Clients. Server implementations MAY use Topic Names that start with a leading $ character for other purposes. remove 4.7.2.1, retaining the non-normative comments from both sections.
    • Resolution:
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      Resolved in WD23

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      Resolved in WD23

      Description

      Section 4.7.2.1 of wd-20 states;
      A Topic Filter that starts with a wildcard character (# or +) does not match Topic Names that begin with a $ character

      This appears to be a normative statement regarding server behaviour without any accompanying normative language.
      While server implementations may choose whether or not to implement predefined $topics I thought we explicitly did want separate all topics starting with $ from the rest of the topic space.

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            • Assignee:
              andrew_banks Andrew Banks (Inactive)
              Reporter:
              al.s-m Allan Stockdill-Mander (Inactive)
            • Watchers:
              4 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: