Is GDScript Can communicate with serial port, under linux and windows ? May I use python plugin to do some communication ? MAy I use C# to communicate ?
Is this possible ? What is the best way ?
Yes. You would use GDNative for this. They are plugins that can run native code, but without recompiling the engine. There are examples in the docs for how to do it with C or C++. I would recommend using C, as it will be the most straight-forward.
https://docs.godotengine.org/en/stable/tutorials/scripting/gdnative/index.html
thx a lot for open a direction for me I've found this resource, may be it is a good start way ? [https://github.com/NangiDev/GDSerCommPlugin]
Not sure, I don't have much experience with it, but it looks okay.
