I am trying to understand MQTT by making client and server programs. When I send a request from the client, the server gets it. However, for some reason, the client doesn't seem to get a response. I'm not sure why this happens.
Connect to the broker just once. Reconnect breaks the "old" connection/subscription.
Thank you! I figured it was a silly mistake.
Couple of other things
I highly recommend downloading and installing MQTT Explorer for helping with debugging MQTT issues
Also, I recommend using a hierarchical topic structure like
bb21/request_page and bb21/send_page etc
rather than two distinct ones - makes things simpler to monitor
Also, I wouldn't be hiding variables until I'd got everything working - why make debugging harder 
Does using a hierarchical topic structure do anything different than two top-level topics? I genuinely don't know.
Do you pronounce it em-cue-tee-tee? Or muh-quit?
Just easier to manage.
I pronounce it as an initialisation. So, should I use an?
I would.
Okay. Thanks.
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