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[mosquitto-dev] PR #3642 - Awaiting CI approval: Fix DISCONNECT reason code (MQTT 5.0 compliance)
  • From: Mustafa Abdullah Kus <mabdkus@xxxxxxxxxxx>
  • Date: Fri, 5 Jun 2026 19:29:17 +0000
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  • Thread-topic: PR #3642 - Awaiting CI approval: Fix DISCONNECT reason code (MQTT 5.0 compliance)
Hi,

I opened PR #3642 about a month ago to fix a MQTT 5.0 spec compliance issue (#3613): Mosquitto currently returns reason code 0x82 (Protocol Error) instead of 0x81 (Malformed Packet) for invalid DISCONNECT fixed-header flags.

The change is a one-line fix in src/handle_disconnect.c. The CI workflow hasn't been approved yet, so I wanted to check if a maintainer could take a look.

PR: https://github.com/eclipse-mosquitto/mosquitto/pull/3642
Related issue: https://github.com/eclipse-mosquitto/mosquitto/issues/3613

Thanks for your time!
Mustafa Abdullah Kus

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