Published message not received on subscriber

[harshakhmk]

Hi, I am testing few examples mentioned here with a publisher and subscriber https://github.com/eclipse/paho.mqtt.rust/blob/master/examples/sync_publish.rs
https://github.com/eclipse/paho.mqtt.rust/blob/master/examples/sync_consume.rs
There was no build issue with code, but publisher is successfully sending message, but subscriber is not receiving any message
On closer inspection, I have seen publisher default connection to v3 broker and subscriber got connected to v4 version, I tried changing the version of mqtt broker in Client, however I was getting error like it is not supported to set the version

[fpagliughi]

It would be difficult to help without any more information than that. Are you able to publish and subscribe to the broker using some available clients like mosquitto_pub & mosquitto_sub? Or did you try a GUI MQTT client to test the connections and view the traffic?

As for versions, the byte/integer version numbers that are put on the wire are:

3 -> MQTT v3.1
4 -> MQTT v3.1.1
5 -> MQTT v5

So, technically, 4 is a version of MQTT v3.

[fpagliughi]

Closing from lack of activity.