ESP32S3 DevKitC1 USB HID: why COM UART port is needed?

Using Arduino Programming Questions
1

I want to make a mouse USB HID with a board ESP32S3 DevKitC1

My problem is that the UART port is mandatory to start the mouse with the USB port
.
Once the mouse is started I can unplug the UART cable and the mouse works with the USB cable only.

If I plug USB cable only my mouse not work

I want that my mouse starts and works with the USB cable only.
What is the problem?

My board is ESP32S3 DevKitC1

My arduino IDE configuration:

image
image715×401 7.82 KB

my code

#ifndef ARDUINO_USB_MODE
#error This ESP32 SoC has no Native USB interface
#elif ARDUINO_USB_MODE == 1
#warning This sketch should be used when USB is in OTG mode
void setup() {}
void loop() {}
#else
#include <Arduino.h>
#include "USB.h"
#include "USBHIDMouse.h"
USBHIDMouse Mouse;

void setup() {
  // initialize the buttons' inputs:
  // initialize mouse control:
  Mouse.begin();
  USB.productName("TEST_USB_HID") ;
      Serial.println("TEST_USB_HID");
  USB.manufacturerName("LR_TECHNOLOGIES");
      Serial.println("LR_TECHNOLOGIES");
  USB.begin();
}

void loop() {

  Mouse.move(1, 1, 0);


  // a delay so the mouse doesn't move too fast:
  delay(10);
}
#endif /* ARDUINO_USB_MODE */