/**
     * 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);
    }

public class BluetoothGattCharacteristic implements Parcelable {
    /**
     * List of descriptors included in this characteristic.
     */
    protected List<BluetoothGattDescriptor> mDescriptors;

    /**
     * Returns a list of descriptors for this characteristic.
     *
     * @return Descriptors for this characteristic
     */
    public List<BluetoothGattDescriptor> getDescriptors() {
        return mDescriptors;
    }
}

public class BluetoothGattDescriptor implements Parcelable {
    /**
     * Updates the locally stored value of this descriptor.
     *
     * <p>This function modifies the locally stored cached value of this
     * descriptor. To send the value to the remote device, call
     * {@link BluetoothGatt#writeDescriptor} to send the value to the
     * remote device.
     *
     * @param value New value for this descriptor
     * @return true if the locally stored value has been set, false if the requested value could not
     * be stored locally.
     */
    public boolean setValue(byte[] value) {
        mValue = value;
        return true;
    }
}

    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

		// получать обозначение BluetoothGattCharacteristic в List<BluetoothGattDescriptor> mDescriptors очередь
        List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors();
        // Настройки траверса BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE ценить , и напиши
        for(BluetoothGattDescriptor descriptor : descriptors) {
                    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
                    mBluetoothGatt.writeDescriptor(descriptor);
        }

    }