Revise paste bleHID

/*********************************************************************
 This is an example for our nRF52 based Bluefruit LE modules

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 please support Adafruit and open-source hardware by purchasing
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MIT license, check LICENSE for more information
 All text above, and the splash screen below must be included in
 any redistribution
*********************************************************************/
#include <bluefruit.h>

BLEDis bledis;
BLEHidAdafruit blehid;

#define MOVE_STEP    10

void setup() 
{
  Serial.begin(115200);
  while ( !Serial ) delay(10);   // for nrf52840 with native usb

Serial.println("Bluefruit52 HID Mouse Example");
  Serial.println("-----------------------------\n");
  Serial.println("Go to your phone's Bluetooth settings to pair your device");
  Serial.println("then open an application that accepts mouse input");
  Serial.println();

Serial.println("Enter following characters");
  Serial.println("- 'WASD'  to move mouse (up, left, down, right)");
  Serial.println("- 'LRMBF' to press mouse button(s) (left, right, middle, backward, forward)");
  Serial.println("- 'X'     to release mouse button(s)");

Bluefruit.begin();
  // HID Device can have a min connection interval of 9*1.25 = 11.25 ms
  Bluefruit.Periph.setConnInterval(9, 16); // min = 9*1.25=11.25 ms, max = 16*1.25=20ms
  Bluefruit.setTxPower(4);    // Check bluefruit.h for supported values

// Configure and Start Device Information Service
  bledis.setManufacturer("Adafruit Industries");
  bledis.setModel("Bluefruit Feather 52");
  bledis.begin();

// BLE HID
  blehid.begin();

// Set up and start advertising
  startAdv();
}

void startAdv(void)
{  
  // Advertising packet
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();
  Bluefruit.Advertising.addAppearance(BLE_APPEARANCE_HID_MOUSE);
  
  // Include BLE HID service
  Bluefruit.Advertising.addService(blehid);

// There is enough room for 'Name' in the advertising packet
  Bluefruit.Advertising.addName();
  
  /* Start Advertising
   * - Enable auto advertising if disconnected
   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
   * - Timeout for fast mode is 30 seconds
   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
   * 
   * For recommended advertising interval
   * https://developer.apple.com/library/content/qa/qa1931/_index.html   
   */
  Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244);    // in unit of 0.625 ms
  Bluefruit.Advertising.setFastTimeout(30);      // number of seconds in fast mode
  Bluefruit.Advertising.start(0);                // 0 = Don't stop advertising after n seconds  
}

void loop() 
{    
  if (Serial.available())
  {
    char ch = (char) Serial.read();

// convert to upper case
    ch = (char) toupper(ch);
    
    // echo
    Serial.println(ch);
  
    switch(ch){
      // WASD to move the mouse
      case 'W':
        blehid.mouseMove(0, -MOVE_STEP);
      break;

case 'A':
        blehid.mouseMove(-MOVE_STEP, 0);
      break;

case 'S':
        blehid.mouseMove(0, MOVE_STEP);
      break;

case 'D':
        blehid.mouseMove(MOVE_STEP, 0);
      break;

// LRMBF for mouse button(s)
      case 'L':
        blehid.mouseButtonPress(MOUSE_BUTTON_LEFT);
      break;

case 'R':
        blehid.mouseButtonPress(MOUSE_BUTTON_RIGHT);
      break;

case 'M':
        blehid.mouseButtonPress(MOUSE_BUTTON_MIDDLE);
      break;

case 'B':
        blehid.mouseButtonPress(MOUSE_BUTTON_BACKWARD);
      break;

case 'F':
        // This key is not always supported by every OS
        blehid.mouseButtonPress(MOUSE_BUTTON_FORWARD);
      break;

case 'X':
        // X to release all buttons
        blehid.mouseButtonRelease();
      break;

default: break;
    }
  }
}