#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>

int scanTime = 5; // Scan time in seconds
BLEScan* pBLEScan;

class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice) {
      Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());
      if (String(advertisedDevice.getName().c_str()) == "BT04-A") {  // Check if the device is HC-05
        Serial.println("BT04-A found! Sending a command...");
        // Further code to connect and send data would go here
      }
    }
};

void setup() {
  Serial.begin(115200);
  Serial.println("Scanning...");

  BLEDevice::init(""); // Initialize BLE device
  pBLEScan = BLEDevice::getScan(); // Create new scan
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true); // Active scan uses more power, but gets results faster
  pBLEScan->setInterval(100);
  pBLEScan->setWindow(99);  // Less or equal to setInterval value
}

void loop() {
  BLEScanResults foundDevices = pBLEScan->start(scanTime, false); // Use object directly
  Serial.print("Devices found: ");
  Serial.println(foundDevices.getCount());  // Use object access syntax
  Serial.println("Scan done!");
  pBLEScan->clearResults();   // delete results from BLEScan buffer to release memory
  delay(2000);
}