Hi and welcome to devnet, Several users on this forum are successfully using QSerialPort to communicate with Arduino boards so it should be a good solution. Can you share the code you use ?

Here the bug report for this issue: https://bugreports.qt.io/browse/QTBUG-78086

@aha_1980 Thank you alot Sir your answer was correct and helped to clean up the problem! Regards

@aha_1980 I'm expecting to read and write data with a serial port, but, for some reason, the data sent by my pc is also read by my pc, so the problems is that the data sent is somehow triggering the readyRead signals. @J-Hilk I noticed that ,effectively, the echo wasn't turned off on the pi. For whatever reason, it completely broke my programs when I'm turning it of, so I'm going to install qt and try again on the pi before calling it a win.

Don't @ the moderators unless you have an issue requiring moderation. Depending on the content of your line edit, you can use toLatin1() or toUtf8() rather than making these two conversions.

@maxime.armand Have you actually tried it? It does exactly what you demand in step 1. And if you look in http://doc.qt.io/qt-5/qtserialport-creaderasync-main-cpp.html you will see that the serial port and the baud rate are given as command line parameters. Just (cross-)compile the program for the Raspberry, and run it. It should work like your HypterTerminal test.