#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>

#define LED_PIN 2

BLECharacteristic *pCharacteristic;

#define SERVICE_UUID        "12345678-1234-1234-1234-123456789abc"
#define CHARACTERISTIC_UUID "87654321-4321-4321-4321-cba987654321"

class MyCallbacks : public BLECharacteristicCallbacks {
  void onWrite(BLECharacteristic *pCharacteristic) {
    String valor = pCharacteristic->getValue().c_str();

    if (valor == "A") {
      digitalWrite(LED_PIN, HIGH);
      Serial.println("LED ENCENDIDO");
    }
    else if (valor == "B") {
      digitalWrite(LED_PIN, LOW);
      Serial.println("LED APAGADO");
    }
  }
};

void setup() {
  Serial.begin(115200);

  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  BLEDevice::init("ESP32C3_LED");

  BLEServer *pServer = BLEDevice::createServer();

  BLEService *pService = pServer->createService(SERVICE_UUID);

  pCharacteristic = pService->createCharacteristic(
                      CHARACTERISTIC_UUID,
                      BLECharacteristic::PROPERTY_READ |
                      BLECharacteristic::PROPERTY_WRITE
                    );

  pCharacteristic->setCallbacks(new MyCallbacks());

  pService->start();

  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->start();

  Serial.println("BLE listo");
}

void loop() {
}