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Where to start to use custom hardware

Is there some documentation on the hardware<–>server communication? How difficult is it to create the Blynk Libraries in C#?
I didn’t find it, but maybe it has already been done by someone else?

In the documentation (Overview - Blynk Documentation), I found a section called “Blynk Cloud (HTTPS API)”. But if I understand it correctly, this is only about communiction between server and app. Is that correct? Is there also an API for the communication between server and hardware?
Thanks!

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Hi, we have our own Blynk library

I’d probably start with the C++ library linked above.

No, the communication between the server and the app is proprietary and not open source.
The API is for communication between devices and the server, but is mostly used for integration with services such as IFTTT.

The hardware to server to hardware communication is probably best documented here:

This relates to Blynk Legacy, but as far as I can tell, the Blynk IoT protocol is very similar, with the majority of changes between the two relating to notifications, emails and event logging.

Pete.

Thank you, PeteKnight.
That was really helpfull!