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How can i know what is the protocol used in Blynk?

So guys, where u define the protocol used in your libraries? I mean how can i know you use TCP or UDP or HTTP? I’m a beginner/newbie. I cannot find the file. Is it in BlynkApi.h file or in BlynkProtocol.h file? Can some enlighten me? Sorry for my bad explanation.

you can share with me