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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.
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