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

// iBeacon UUID (can be changed)
#define BEACON_UUID "12345678-1234-5678-1234-567812345678"

void setup() {
    Serial.begin(115200);
    BLEDevice::init("ESP32_BLE_Beacon");  // Device name

    BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
    BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();

    // iBeacon flag
    oAdvertisementData.setFlags(0x06);

    // Manufacturer data (Apple iBeacon format)
    std::string strManufacturerData = "";
    strManufacturerData += (char)0x4C;  // Apple's company ID (0x004C)
    strManufacturerData += (char)0x00;
    strManufacturerData += (char)0x02;  // iBeacon Type
    strManufacturerData += (char)0x15;  // iBeacon Length

    // Adding UUID
    strManufacturerData += BEACON_UUID;

    // Major and Minor values (can be changed)
    strManufacturerData += (char)0x00;
    strManufacturerData += (char)0x01;  // Major
    strManufacturerData += (char)0x00;
    strManufacturerData += (char)0x01;  // Minor

    // TX Power (calibrated for 1 meter)
    strManufacturerData += (char)0xC5;  

    oAdvertisementData.setManufacturerData(strManufacturerData);
    pAdvertising->setAdvertisementData(oAdvertisementData);
    pAdvertising->start();

    Serial.println("ESP32 BLE Beacon Started");
}

void loop() {
    delay(1000);
}