// Include the Bluetooth Serial Library
#include "BluetoothSerial.h"

// Check if Bluetooth is properly enabled
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

void setup() {
  Serial.begin(115200);
  // Define the name that will appear on your Phone's Bluetooth list
  SerialBT.begin("ESP32_Lab_Group_X"); 
  Serial.println("The device is started, now you can pair it with bluetooth!");
  
  pinMode(2, OUTPUT); // LED connected to GPIO 2
}

void loop() {
  // Check if data is coming from the Smartphone
  if (SerialBT.available()) {
    char incomingChar = SerialBT.read();
    Serial.print("Received: ");
    Serial.println(incomingChar);

    // Bluetooth Logic
    if (incomingChar == '1') {
      digitalWrite(2, HIGH);
      SerialBT.println("Success: LED turned ON");
    } 
    else if (incomingChar == '0') {
      digitalWrite(2, LOW);
      SerialBT.println("Success: LED turned OFF");
    }
  }
  delay(20);
}