/*
 Controlling LED/GPIO using Bluetooth
 http:://www.electronicwings.com
*/ 

#include "BluetoothSerial.h"

const char LED= 2;
const char turnON ='a';
const char turnOFF ='b';

#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);
 pinMode(LED, OUTPUT);
 SerialBT.begin("ESP32test"); //Bluetooth device name
 Serial.println("The device started, now you can pair it with bluetooth!");
 Serial.println("Now You can TURN ON LED by sending 'a' and TURN OFF by 'b'");
}

void loop() {
 char message;
 
 if (SerialBT.available()) {
   message=SerialBT.read();
   Serial.write(message);
   
   if(message==turnON){
     digitalWrite(LED, HIGH);      //Turn LED ON
     Serial.println(" :LED Turned ON");
     SerialBT.println("LED Turned ON");   
   }
 
   else if(message==turnOFF){
     digitalWrite(LED, LOW);        //Turn LED Off
     Serial.println(" :LED Turned OFF");
     SerialBT.println("LED Turned OFF");   
   }
 
   else{
     Serial.println(" :Invalid Input"); 
     SerialBT.println("Invalid Input");
   } 
 }
 delay(20);
}