Server - app and server - hardware protocol?

Hello, because default Blynk mobile app doesn’t support much customization and support compiling, I’m thinking about creating GUI on my own.

But I don’t know how is the protocol between server and app, and protocol between server and hardware. I found a topic here: Blynk’s communication protocol/method? but it is not clear that “custom tcp/ip protocol” is between which and which, and how is the protocol which on top of web socket.

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Server - App = Blynk custom protocol;
Server - Hardware = Blynk custom protocol;
WebSockets also using this custom protocol.

It is indeed very simple. You can also dig into java client