I have a que about sub packet. I subscibed to one topic with QOS1.
What happens next?
The broker will send the matching topic to me. Do I need to acknowledge that packet? If not then what is the meeting of QOS for sub-packet?
In my application, I need to turn on the relay. Once I subscribed to one topic using QOS1, It makes sure I will get the message. But how the server knows that I got the message?