MQTT Broker and Client testing

[Domoticatorino]

Dear all,
I am testing MQTT apps. I have a MQTT client which send a Json topic to LM Broker.

After that I set LM MQTT client app in order to read data sent received by. Topic name I use is the same I set on the MQTT client.

LM client app is correctly link to broker but how can I understand if data are received from broker? 

I follow the script but there's a way, before setting the scripts, if data are correctly reveived by broker? 

Thanks.

BR

[Daniel]

You can use MQTT explorer on PC to see every topic.
https://mqtt-explorer.com/

[admin]

What do you mean by correctly received? Broker does not validate the data in any way. It simply passes published data to all subscribers.

[Erwin van der Zwart]

You can also put log(payload) in the script in section, that way the received payload on the topic will be logged in the controller.

[Domoticatorino]

What do you mean by correctly received? Broker does not validate the data in any way. It simply passes published data to all subscribers.

Hi admin, yes I know that broker simply passes data but I though there was a way to log the publishing data sent by the client.

In any case with MQTT Explorer I was able to read the topics and payloads of the client so now I understand how it works. 

Thanks a lot.