Как убедиться, что устройство Android было отключено от устройства BLE?

У меня есть приложение для Android, которое используется с устройством BLE (BM70). Я могу подключиться к устройству BLE дважды, но в третий раз требуется некоторое время для фактического обнаружения устройства BLE. Я использовал другие приложения, которые могут последовательно обнаруживать устройство BLE более чем в два раза. Есть ли полезные методы для подключения? и отключить от устройства BLE? Это мой код для услуги:-

public class ServiceBTLE_GATT extends Service {
    /**
     * Service for managing connection and data communication with a GATT server hosted on a
     * given Bluetooth LE device.
     */
    private final static String TAG = ServiceBTLE_GATT.class.getSimpleName();

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;

    private int mConnectionState = STATE_DISCONNECTED;
    public static final int STATE_DISCONNECTED = 0;
    public static final int STATE_CONNECTING = 1;
    public static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED = "ServiceBTLE_GATT.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED = "ServiceBTLE_GATT.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED = "ServiceBTLE_GATT.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE = "ServiceBTLE_GATT.ACTION_DATA_AVAILABLE";
    public final static String EXTRA_UUID = "ServiceBTLE_GATT.EXTRA_UUID";
    public final static String EXTRA_DATA = "ServiceBTLE_GATT.EXTRA_DATA";


    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;

                mConnectionState = STATE_CONNECTED;

                broadcastUpdate(intentAction);

                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" + mBluetoothGatt.discoverServices());
                mBluetoothGatt.discoverServices();
            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;

                mConnectionState = STATE_DISCONNECTED;

                Log.i(TAG, "Disconnected from GATT server.");

                broadcastUpdate(intentAction);
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {

            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
            } else {
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {

            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {

            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }

//        @Override
//        public void onCharacteristicWrite(BluetoothGatt gatt,
//                                          BluetoothGattCharacteristic characteristic, int status) {
//
//        }
    };

    public void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }

    private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) {

        final Intent intent = new Intent(action);

        intent.putExtra(EXTRA_UUID, characteristic.getUuid().toString());

        // For all other profiles, writes the data formatted in HEX.
        final byte[] data = characteristic.getValue();

        if (data != null && data.length > 0) {

            intent.putExtra(EXTRA_DATA, new String(data) + "\n" + Utils.hexToString(data));
        } else {
            intent.putExtra(EXTRA_DATA, "0");
        }

        sendBroadcast(intent);
    }

    public class BTLeServiceBinder extends Binder {

        ServiceBTLE_GATT getService() {
            return ServiceBTLE_GATT.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override
    public void onCreate() {

    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        disconnect();
        mBluetoothGatt = null;
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new BTLeServiceBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.
        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     * @return Return true if the connection is initiated successfully. The connection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public boolean connect(final String address) {

        mBluetoothAdapter.cancelDiscovery();

        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress) && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");

            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);

        if (device == null) {
            Toast.makeText(this, "Device not found.  Unable to connect.", Toast.LENGTH_SHORT).show();
            return false;
        }

        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.

        if (mBluetoothGatt == null) {

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                mBluetoothGatt = device.connectGatt(this, false, mGattCallback, BluetoothDevice.TRANSPORT_LE);
            }
            Log.d(TAG, "Trying to create a new connection.");
            mBluetoothDeviceAddress = address;
            mConnectionState = STATE_CONNECTING;
        } else {
            mBluetoothGatt.discoverServices();
        }

        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }

        mBluetoothGatt.disconnect();
        mBluetoothGatt.close();
        mBluetoothGatt = null;
//        broadcastUpdate(ACTION_GATT_DISCONNECTED);

    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {


    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }

        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Request a write on a given {@code BluetoothGattCharacteristic}. The write result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicWrite(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }

//        try{
//            Thread.sleep(1000);
//        }catch (InterruptedException e)
//        {
//            Log.d("SleepLog",e.toString());
//        }

        mBluetoothGatt.writeCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled If true, enable notification.  False otherwise.
     */
//    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
//
//        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
//            Log.w(TAG, "BluetoothAdapter not initialized");
//            return;
//        }
//
//        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
//
//        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
//                UUID.fromString(getString(R.string.CLIENT_CHARACTERISTIC_CONFIG)));
//
//        if (enabled) {
//            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
//        }
//        else {
//            descriptor.setValue(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
//        }
//
//        mBluetoothGatt.writeDescriptor(descriptor);
//    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {

        if (mBluetoothGatt == null) {
            return null;
        }

        return mBluetoothGatt.getServices();
    }
}

Любая помощь или предложения приветствуются. Спасибо.

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