HID-compliant Touchscreen

[ErinaceusLinnaeus]

I'm trying to use a touchscreen (7" by waveshare) on the Due's USB Port. But it doesn't work.
I tried a mouse, that worked. I tried the touchscreen on a pc, that worked.
On the pc the touchscreen appeared as a HID-compliant Touchscreen. Because I thought it would be recognized as a mouse.
I suspect that that's why my code doesn't respond to it.

Maybe Touchscreen Data is different and we/I need a separate TouchscreenController.h/.cpp for this?

The code is just notifying to the serial monitor:

void mouseMoved() {
Serial.println("mouseMoved");
}
void mouseDragged() {
Serial.println("mouseDragged");
}
void mousePressed() {
Serial.println("mousePressed");
}
void mouseReleased() {
Serial.println("mouseReleased");
}

[ErinaceusLinnaeus]

I want to understand how the library works, so I can do something myself.
Can someone please give me a hint, where I can intercept the packets that should come in through the USB port?
I think I found some specification on how touchscreens pack their data and what I can expect to get.