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    I'm no expert in C#, but I don't see you actually sending anthing. And where is SerialPort_DataReceived defined? Commented Dec 27, 2022 at 13:20
  • I only copy/past the essential code... but its there... gonna edit the question and add them Commented Dec 27, 2022 at 19:03
  • Have you actually made sure (for example through a debug message), that serialPort.WriteLine("HELLO"); is actually executed? From what you described the problem is in your C# app, not in the Arduino part Commented Dec 27, 2022 at 19:17
  • Using the Arduino IDE Serial Monitor this works very well with the Arduino Nano 33 BLE ... that means that the data is getting to your computer ... what you do with the data after it gets there is off topic here Commented Dec 27, 2022 at 19:33
  • As I also mention in my question, this C# code works fine with an Arduino Nano, so I'm sure the C# code is working. It just doesn't work with the new Arduino Nano 33 BLE. Probably something to do with he mbed layer... but it doesn't make sense, working with Arduino IDE Serial Monitor and not with a C# compiled app. I also read somewhere that the Arduino Nano 33 BLE USB serial port is virtual, so it is a pure software serial port and not a hardware conversion from serial to USB. Commented Dec 27, 2022 at 19:57