[jira] [Created] (ARTEMIS-6215) Support sending PUBREC(0x91) for duplicate PUBLISH with DUP=0

["Justin Bertram (Jira)" <ji...@apache.org>]

Justin Bertram created ARTEMIS-6215:
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             Summary: Support sending PUBREC(0x91) for duplicate PUBLISH with DUP=0
                 Key: ARTEMIS-6215
                 URL: https://issues.apache.org/jira/browse/ARTEMIS-6215
             Project: Artemis
          Issue Type: Improvement
          Components: MQTT
            Reporter: Justin Bertram
            Assignee: Justin Bertram


When the broker receives a QoS 2 {{PUBLISH}} reusing a packet identifier that is still in use, it currently acknowledges with {{PUBREC}} reason code {{0x00}} (Success) and drops the reused-ID message as a duplicate even when the {{DUP}} flag indicates an unexpected reuse rather than a legitimate retransmission (typically a non-compliant client).

Add a setting, {{rejectQoS2PublishWithReusedPacketId}} (default {{false}}), configurable on the MQTT acceptor. When enabled, the broker responds to this case for MQTT 5 clients with {{PUBREC}} reason code {{0x91}} (Packet Identifier in use) instead of {{0x80}}.

This is an opt-in diagnostic aid and is not required by the MQTT specification. See the updated MQTT documentation in the PR for more details.



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