#include <Arduino.h>

/*Program to control LED (ON/OFF) from ESP32 using Serial Bluetooth
 * Thanks to Neil Kolbans for his efoorts in adding the support to Arduino IDE
 * Turotial on: www.circuitdigest.com&nbsp;
 */

#include "BluetoothSerial.h" //Header File for Serial Bluetooth, will be added by default into Arduino
BluetoothSerial ESP_BT; //Object for Bluetooth

int incoming;

void setup() {
  Serial.begin(9600); //Start Serial monitor in 9600
  ESP_BT.begin("ESP32_LED_Control"); //Name of your Bluetooth Signal
  Serial.println("Bluetooth Device is Ready to Pair");
  pinMode (LED_BUILTIN, OUTPUT);//Specify that LED pin is output
}


void loop() {
  if (ESP_BT.available()) { //Check if we receive anything from Bluetooth
    incoming = ESP_BT.read(); //Read what we recevive 
    Serial.print("Received:"); Serial.println(incoming);
    if (incoming == 49) {
        digitalWrite(LED_BUILTIN, HIGH);
        ESP_BT.println("LED turned ON");
    }

    if (incoming == 48) {
        digitalWrite(LED_BUILTIN, LOW);
        ESP_BT.println("LED turned OFF");
    }     

    if (incoming == 57) {
        ESP_BT.println("[APP] Free memory: " + String(esp_get_free_heap_size()) + " bytes");
    }     
  }

  delay(1000);
}