How to automatically pair Bluetooth?

Question

Java

Good day!
In my project, it is necessary to implement automatic pairing of a beacon and an Android device via Bluetooth, I found out on the Internet that this can be done using the setPin method, but nothing works for me, please help me figure it out!
Android 4.0.4 (HTC Desire S) and Bluetooth module HC-05.
Information found on these links here and here .

My code

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.UUID;

public class MainActivity extends AppCompatActivity {

    private Button mRedButton;
    private Button mGreenButton;
    private boolean isRed = false;
    private boolean isGreen = false;

    private BluetoothSocket mClientSocket;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRedButton   = (Button) findViewById(R.id.red_button);
        mGreenButton = (Button) findViewById(R.id.green_button);

        String enableBT = BluetoothAdapter.ACTION_REQUEST_ENABLE;
        startActivityForResult(new Intent(enableBT), 0);

        BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();

        try{
            BluetoothDevice device = bluetooth.getRemoteDevice("98:D3:32:10:80:73");

            Method convert = device.getClass().getMethod("convertPinToBytes", String.class);

            byte[] pinBytes = (byte[]) convert.invoke(device, "1234");

            Method setPin = device.getClass().getMethod("setPin", byte[].class);
            Boolean success = (Boolean) setPin.invoke(device, pinBytes);

            if (success)
                Toast.makeText(MainActivity.this, "Success to add the PIN.", Toast.LENGTH_SHORT).show();

//            device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
//
//            setBluetoothPairingPin(device, String.valueOf(pin));

            //Инициируем соединение с устройством
            Method m = device.getClass().getMethod(
                    "createRfcommSocket", new Class[] {int.class});

            mClientSocket = (BluetoothSocket) m.invoke(device, 1);
            mClientSocket.connect();

            //В случае появления любых ошибок, выводим в лог сообщение
        } catch (IOException e) {
            Log.d("BLUETOOTH", e.getMessage());
        } catch (SecurityException e) {
            Log.d("BLUETOOTH", e.getMessage());
        } catch (NoSuchMethodException e) {
            Log.d("BLUETOOTH", e.getMessage());
        } catch (IllegalArgumentException e) {
            Log.d("BLUETOOTH", e.getMessage());
        } catch (IllegalAccessException e) {
            Log.d("BLUETOOTH", e.getMessage());
        } catch (InvocationTargetException e) {
            Log.d("BLUETOOTH", e.getMessage());
        }

        Toast.makeText(MainActivity.this, "Конект", Toast.LENGTH_SHORT).show();

        mRedButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Действие при нажатие
                try {
                    OutputStream outStream = mClientSocket.getOutputStream();

                    if(isRed){
                        outStream.write(70);
                        isRed = false;
                    }
                    else
                    {
                        outStream.write(71);
                        isRed = true;
                    }

                } catch (IOException e) {
                    Log.d("BLUETOOTH", e.getMessage());
                }

                Toast.makeText(MainActivity.this, "Красный светодиод", Toast.LENGTH_SHORT).show();
            }
        });

        mGreenButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Действие при нажатие
                try {
                    OutputStream outStream = mClientSocket.getOutputStream();

                    if(isGreen){
                        outStream.write(60);
                        isGreen = false;
                    }
                    else
                    {
                        outStream.write(61);
                        isGreen = true;
                    }

                } catch (IOException e) {
                    Log.d("BLUETOOTH", e.getMessage());
                }
                Toast.makeText(MainActivity.this, "Зеленый светодиод", Toast.LENGTH_SHORT).show();
            }
        });
    }
}