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mosquitto_pub with QOS 1 exiting on connection loss instead of queuing message #2187

JsBergbau opened this issue Apr 21, 2021 · 2 comments


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JsBergbau commented Apr 21, 2021

According to


So according to specification sender stores messages until it is successfully delivered.

Execute mosquitto_pub -t test -h <host> -u <user> -P <PW> -l -q 1

Type messages one by one and see that they are received. No simulate some kind of network failure like the broker going away
sudo iptables -A OUTPUT -d <broker_IP>/32 -j REJECT

Now type some messages again in above window so that mosquitto_pub should deliver it after connection is re-established. However after some time an error appears Error: Publish returned 4, disconnecting.
mosquitto_pub exits and all messages after connection problems are lost.

So is the MQTT specification unclear or is this a bug in mosquitto_pub? Personally I think with QOS 1 message should get queued up to a configurable limit before messages get dropped.

@ralight ralight closed this as completed in 07399c2 Jun 9, 2021
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ralight commented Jun 9, 2021

I'm sorry for not having commented here before, you can see that I addressed this a while back and it's now part of the release.

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Thank you very much. Just tested and it works now as expected.

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