Question

I want to communicate with device which firmware is described there

Here is my code. But in that code I receive nulls, negative numbers and other trash. What’s wrong in my code?

Answer 1

You should first make a check to find the synchronization bytes that are first in the message struct. Look for the values 0xA5 and 0x5A. When you find those you can start to decode the rest of the message.

It seems like the ModEEG thing is just outputting a steady stream of bytes so you have to look for the message start markers. Could be good to check those before decoding any message.