MQTT Check broker and topic live


I’ve purchased the MQTT TCP/IP extension.
I cannot share the block since its under disclosure, but what i can tell is the app is connect with the BLE and MQTT TCP/IP.

Basically how to check if :
The server/broker and the topic is connected in real time ?

As i did, the server is always connected if i use the timer but how to check if the the topic is live or not in real time ?

you can share an image of your blocks