@ADR_PT you may want to start using QSerialPort the asynchronous (non-blocking) approach, by using signals & slots.
Take a look at the serial terminal example

@Buckwheat Thanks for the hint - I agree with you :-)
People often ask questions which are hard to understand or do not provide enough information (like in this thread), if you see such questions again and again it is easy to loose patience, especially if you have a bad day :-)
@another_one Sorry if I was rude! Try to be more precise if you ask a question, then it is easier to answer it :-)