ESP32 Arduino Send Keystroke as BLE Keyboard

ESP32_SendKeystroke.ino

#include <M5StickC.h>
#include <BleKeyboard.h>

BleKeyboard bleKeyboard;

void setup() {
  Serial.begin(115200);
  Serial.println("Starting ...");

  M5.begin();
  M5.Axp.ScreenBreath(8);
  M5.Lcd.setRotation(3);
  drawPaused();

  // bleKeyboard.begin();
}

bool paused = true;
int max_cnt = 0;

void drawPaused() {
  M5.Lcd.fillScreen(TFT_BLACK);
  M5.Lcd.setTextColor(TFT_WHITE);
  M5.Lcd.setTextSize(2);
  M5.Lcd.setCursor(50, 20, 4);
  M5.Lcd.println("||");
}

bool setPaused() {
  M5.update();
  int last_max_cnt = max_cnt;
  if (paused) {
    if (M5.BtnA.pressedFor(1800))
      max_cnt = 1000;
    else if (M5.BtnA.pressedFor(1500))
      max_cnt = 500;
    else if (M5.BtnA.pressedFor(1200))
      max_cnt = 400;
    else if (M5.BtnA.pressedFor(900))
      max_cnt = 300;
    else if (M5.BtnA.pressedFor(600))
      max_cnt = 200;
    else if (M5.BtnA.pressedFor(300))
      max_cnt = 100;
    else if (M5.BtnA.isPressed())
      max_cnt = 0;

    if (last_max_cnt != max_cnt) {
      M5.Lcd.fillScreen(TFT_BLACK);
      M5.Lcd.setTextColor(TFT_WHITE);
      M5.Lcd.setCursor(85, 50, 4);
      M5.Lcd.setTextSize(1);
      M5.Lcd.printf("%4d", max_cnt);
    }
  }
  if (M5.BtnA.wasReleased()) {
    paused = !paused;
    Serial.print("paused = ");
    Serial.println(paused);
  
    if (paused) {
      drawPaused();
      ESP.restart();
    } else {
      bleKeyboard.begin();
    }
  }
  return paused;
}

void loop() {
  if (setPaused()) {
    delay(50);
    return;
  }

  if (bleKeyboard.isConnected()) {
    M5.Lcd.fillScreen(TFT_BLUE);
    Serial.println("Sending Ctrl...");

    bleKeyboard.press(KEY_LEFT_CTRL);
    delay(30);
    bleKeyboard.releaseAll();

  } else {
    M5.Lcd.fillScreen(TFT_RED);
  }

  if (max_cnt > 0) {
    if (--max_cnt == 0) {
      paused = true;
      drawPaused();
      ESP.restart();
      return;
    }
  }

  Serial.println("Waiting 5 seconds...");

  M5.Lcd.setTextColor(TFT_WHITE);
  for (int i = 5; i > 0; i--) {
    if (bleKeyboard.isConnected()) {
      M5.Lcd.fillScreen(TFT_BLUE);
    } else {
      M5.Lcd.fillScreen(TFT_RED);
    }
    M5.Lcd.setCursor(30, 4, 8);
    M5.Lcd.setTextSize(1);
    M5.Lcd.print(i);
    M5.Lcd.setCursor(85, 50, 4);
    M5.Lcd.setTextSize(1);
    M5.Lcd.printf("%4d", max_cnt);

    for (int j = 0; j < 10; j++) {
      if (setPaused())
        return;
      delay(100);
    }
  }      
}