🚀 go-pugleaf

> I can create a handle for the COMport with CreateFile but if I use the
> handle in WriteFile or SetCommMask the program hangs up.
> This happens only, when in the Thread WaitCommEvent is used. I found out,
> that the whole program concerning the handle for the comport hangs there.
If
> something should be sent (but does not) and then a character is received,
> both is done together and then everything hangs again at WaitCommEvent
until
> the next character is received

WaitCommEvent will do exactly that unless the port was opened with
FILE_FLAG_OVERLAPPED. Otherwise WaitCommEvent enters an efficient wait state
and blocks until one of the specified events occurs.

You can either put this processing in a worker thread so the application
thread can continue to process messages, etc. or you can use OVERLAPPED_IO.
However, even with OVERLAPPED_IO it often makes sense to put the serial i/o
in a thread or threads (one for input, one for output).