How to use the un-blocking method of MqttClient

Question

When I try the below code to connect to the mosquitto broker, as you know, connecting to the broker might takes few seconds/minutes, and during that time when the b

Answer 1

what button? establishing a connection is almost instantly.

There are asynchronous versions of mqtt. Code samples for that. If you want to make the synchronous non-blocking. You could start it up in another thread.