#include "BluetoothSerial.h"
/*
#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);
 SerialBT.begin("ESP32test"); //Bluetooth device name
 Serial.println("The device started, now you can pair it with bluetooth!");
 pinMode(27,OUTPUT);
}
void loop() {
 /*if (Serial.available()) {
 SerialBT.write(Serial.read());
 }*/
 if (SerialBT.available()) {
 char x=SerialBT.read();
 //Serial.write(SerialBT.read());
 if(x=='A'){
 Serial.write(x);
 digitalWrite(27,HIGH);
 }
 if(x=='B'){
 Serial.write(x);
 digitalWrite(27,LOW);
 }
 }
}