#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEBeacon.h>

const char* uuid = "73697475-6D73-6974-756D-736974756D15";
const uint16_t major = 1111;
const uint16_t minor = 1125;
const int txPower = -4;      // +–4 dBm output
const int advInterval = 500; // ms

void setup() {
  Serial.begin(115200);
  BLEDevice::init("Beacon");
  BLEServer* pServer = BLEDevice::createServer();
  BLEBeacon beacon;
  beacon.setManufacturerId(0x004C); // Apple’s Company ID for iBeacon
  beacon.setProximityUUID(BLEUUID(uuid));
  beacon.setMajor(major);
  beacon.setMinor(minor);
  beacon.setSignalPower(txPower);
  BLEAdvertising* pAdv = pServer->getAdvertising();
  pAdv->setAdvertisementType(ADVERTISEMENT_TYPE_NON_CONNECTABLE_UNDIRECTED);
  pAdv->setMinInterval(advInterval);
  pAdv->setMaxInterval(advInterval);
  pAdv->setManufacturerData(beacon.getData());
  pAdv->start();
  Serial.println("iBeacon started");
}

void loop() {
  // nothing needed—advertising happens in hardware
  delay(1000);
}