Re: [mosquitto-dev] Warning: Received PUBREL from my-bridge for an unkno

[ajay dinakaran <ajaydinakaran16@xxxxxxxxx>]

Thanks for replying, Roger. We are using 1.6.2 version which is greater than 1.6.13 version.

In 1.6.2 Version, we are facing Warning: Received PUBREL from my-bridge for an unknown packet identifier 51.
In 2.0.11 Version, we are facing Reused message ID 51 from my-bridge detected.Clearing from storage. In this version, we enabled persistence to write it to a file.

In both cases, Mosquitto is not sending PUBREC back to the sender.

I'm not able to reproduce this in a fresh setup. Not sure, how did mosquitto got into this state. Let me know if there is a specific commit we can look into if there is a fix.

Regards,

Ajay.D

On Wed, Nov 10, 2021 at 3:25 PM Roger Light <roger@xxxxxxxxxx> wrote:

Hi Ajay,

Looking back over the changelog, it seems likely that this is related
to a bug that has been fixed - I don't have the specifics to hand, but
there are definitely mentions of handling messages with QoS > 0 which
could be causing what you see. I'd recommend upgrading to a more
recent version - either 1.6.13 or 2.0.13 - and seeing if you still get
the problem.

Regards,

Roger

On Wed, 10 Nov 2021 at 06:16, ajay dinakaran <ajaydinakaran16@xxxxxxxxx> wrote:
>
> Hi Team,
>  Recently, we have faced the below error in a few mosquito instances. After we get the below warning, mosquitto is not sending the PUBREC packet for the subsequent messages to the sender once it receives the PUBLISH packet. I understand PUBCOMP is sent even after the PUBREC warning. But, I believe something else is blocking the mosquitto to send the PUBREC packet for the subsequent messages. Here sender is the Hive MQ to the mosquitto (V1.6.2). Mosquitto and HiveMQ are connected via a bridge.
>
> 2021-11-09T05:22:18: Received SUBACK from my-bridge
> 2021-11-09T05:22:41: Received PUBLISH from my-bridge (d0, q2, r0, m51, 'mytopic/command/Test123', ... (7 bytes))
> 2021-11-09T05:22:41: Sending PUBREC to my-bridge (m51, rc0)
> 2021-11-09T05:22:41: Received PUBREL from my-bridge (Mid: 51)
> 2021-11-09T05:22:41: Warning: Received PUBREL from my-bridge for an unknown packet identifier 51.
> 2021-11-09T05:22:41: Sending PUBCOMP to my-bridge (m51)
> 2021-11-09T05:22:57: Received PUBLISH from my-bridge (d0, q2, r0, m101, 'mytopic/command/Test456', ... (7 bytes))
> 2021-11-09T05:23:36: Sending PINGREQ to my-bridge
>
> Regards,
> Ajay.D
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