#include "BluetoothSerial.h"

const int LED = 2;
const char turnOn = 'a';
const char turnOff = 'b';

BluetoothSerial SerialBT;

void setup(){
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  SerialBT.begin("ESP32TEST");
}
void loop(){
  char message;

  if(SerialBT.available()){
    message = SerialBT.read();

    if(message == turnOn){
      digitalWrite(LED, HIGH);
    }
    else if(message == turnOff){
      digitalWrite(LED, LOW);
    }
    else{
      Serial.println("invalid Input");
    }
  }
  delay(1000);
}