QoS2 duplicate PUBLISH stuff - #6648
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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). This commit adds a setting, rejectQoS2PublishWithReusedPacketId, 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. Co-Authored-By: Claude <noreply@anthropic.com>
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