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Trouble understanding mqtt

I'm trying to use mqtt for a project I'm working on which involves generating and sending a csv file from a nodemcu esp32. For that I'm trying to understand mqtt and so far I'm good with the theory but i just can't figure out the codes and tutorials. Like i tried to understand the examples for pubsubclient and I'm lost especially on the void callback function. What should i do?

submitted by /u/bazoukibarnacle
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