QT 5.10.1 Serial-Port not sending, why?

Question

There is no error while compiling and running the Binary as root! But on the receiving set is no signal, why? I've testet both connections:

• real USB-RS232 - Adapter QString portName = "/dev/ttyUSB0";
• Host-Pipe to VirtualBox QString portName = "/dev/Winsock";

If somebody would help me, my code is here:

https://github.com/KarmaMan1982/QTSerialSender

Answer 1

Your business logic, which is everything included between

QCoreApplication a(argc, argv);

and

return a.exec();

but excluding those lines won't do what you want. This should be part of a slot in a class that extends QObject. This slot would have to be invoked by any mean (for instance, a QTimer) when the application runs.

QSerialPort doesn't do anything before a.exec() is called.