esp32 cyd BT 6 with MAC

#include "BluetoothSerial.h"

BluetoothSerial SerialBT;
const char* targetDeviceName = "HostDeviceName"; // Replace with host name
const char* pin = "1234"; // Host's pairing PIN
bool deviceFound = false;

// Async scan callback
void btAdvertisedDeviceFound(BTAdvertisedDevice *pDevice) {
  Serial.printf("Found: %s\n", pDevice->toString().c_str());

  if (pDevice->getName().compare(targetDeviceName) == 0) {
    Serial.println("Target device located! Stopping scan...");
    SerialBT.discoverAsyncStop();
    deviceFound = true;

    // Connect using MAC address
    if (SerialBT.connect(pDevice->getAddress())) {
      Serial.println("Successfully connected!");
    } else {
      Serial.println("Connection failed");
    }
  }
}

void setup() {
  Serial.begin(115200);
  SerialBT.onConfirmRequest(nullptr); // Disable SSP pairing

  // Initialize as client with PIN
  SerialBT.setPin(pin);
  if (!SerialBT.begin("ESP32_Client", true)) {
    Serial.println("BT init failed!");
    while(1);
  }

  // Start async scan
  if (SerialBT.discoverAsync(btAdvertisedDeviceFound)) {
    Serial.println("Scanning for devices...");
    delay(10000); // Scan for 10 seconds
    if (!deviceFound) {
      SerialBT.discoverAsyncStop();
      Serial.println("Scan timeout - device not found");
    }
  }
}

void loop() {
  // Handle data transfer when connected
  if (SerialBT.connected()) {
    // Read from host
    if (SerialBT.available()) {
      String data = SerialBT.readString();
      Serial.print("Received: ");
      Serial.println(data);
    }

    // Send to host
    if (Serial.available()) {
      SerialBT.write(Serial.read());
    }
  } else if (deviceFound) {
    // Reconnection logic
    Serial.println("Attempting reconnect...");
    delay(5000);
    SerialBT.connect();
  }
}