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

#define SERVICE_UUID        "0000180D-0000-1000-8000-00805F9B34FB" // Replace with your service UUID
#define CHARACTERISTIC_UUID "00002A37-0000-1000-8000-00805F9B34FB" // Replace with your characteristic UUID
#define BEACON_NAME "YourBLEBeacon" // Set your beacon name here

BLEServer* pServer = NULL; // Represents the BLE peripheral device in a BLE communication setup. pServer is an instance of the BLEServer 
BLECharacteristic* pCharacteristic = NULL; // Is a specific data element within a BLE service. Characteristics are used to represent specific data or features provided by the peripheral device
bool deviceConnected = false;

class MyServerCallbacks : public BLEServerCallbacks {
  void onConnect(BLEServer* pServer) {
    deviceConnected = true;
  }

  void onDisconnect(BLEServer* pServer) {
    deviceConnected = false;
  }
};

class MyCharacteristicCallbacks : public BLECharacteristicCallbacks {
  void onWrite(BLECharacteristic *pCharacteristic) {
    std::string value = pCharacteristic->getValue();
    // Handle data received from the beacon
  }
};

void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
  BLEDevice::init(BEACON_NAME);  
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());

  BLEService *pService = pServer->createService(BLEUUID(SERVICE_UUID));
  pCharacteristic = pService->createCharacteristic(
    BLEUUID(CHARACTERISTIC_UUID),
    BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE
  );

  pCharacteristic->setCallbacks(new MyCharacteristicCallbacks());

  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();

  Serial.println("The device started, now you can pair it with bluetooth!");

}

void loop() {
  
  // Handle other tasks here
}