BLE Отключение соединения

Question

Я пытаюсь передавать данные с помощью BLE, но устройство не остается подключенным. В настоящее время мы можем подключить и распечатать все UUID сервисов и характеристик и установить соединение. Он подключается к устройству BLE в течение очень короткого периода времени, после чего устройство впоследствии не подключается к приложению.

import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothProfile;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Semaphore;

public class ConnectActivity extends AppCompatActivity {

    private BluetoothAdapter mBluetoothAdapter;
    Set<BluetoothDevice> pairedDevices;
    BluetoothDevice connectDevice;
    BluetoothGatt bluetoothGatt;
    List<BluetoothGattService> services;
    private Queue<BluetoothGattCharacteristic> chars;

    private static final String DAQSERVICE = "FFD7";

    private static final String SAMPLING_RATE_UUID = "FFD8";
    private static final String DATA_UUID = "FFD9";
    private static final String BATTERY_UUID = "FFDA";
    private static final String CONTROL_UUID = "FFDB";
    private static final String TAG = "error";

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

        Button btn = (Button) findViewById(R.id.connect_button);
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        pairedDevices = mBluetoothAdapter.getBondedDevices();
        chars = new LinkedList<BluetoothGattCharacteristic>();

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    streamData();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
    }

    //pop up bluetooth settings menu if we cannot find device
    void streamData() throws IOException {
        for (BluetoothDevice device : pairedDevices) {
            if (device.getName().equals("Connection Test")) {

                connectDevice = device;
                mBluetoothAdapter.cancelDiscovery();
                System.out.println("connecting to gatt");
                bluetoothGatt = connectDevice.connectGatt(this, false, btleGattCallback);
            }
        }
    }

    @SuppressLint("New API")
    private BluetoothGattCallback btleGattCallback = new BluetoothGattCallback() {
        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) {
            //this will get called anytime you perform a read or write characteristic operation
            byte[] data = characteristic.getValue();
            System.out.print("data buffer updated: ");
            for (int i = 0; i < data.length; i++) {
                System.out.print(data[i]);
            }
            System.out.println();
        }

        @Override
        public void onConnectionStateChange(final BluetoothGatt gatt, final int status, final int newState) {
            // this will get called when a device connects or disconnects
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                discoverServices();
            }
        }

        @Override
        public void onServicesDiscovered(final BluetoothGatt gatt, final int status) {
            // this will get called after the client initiates a BluetoothGatt.discoverServices() call
            //getServices();
            Thread workerThread = new Thread(new Runnable() {
                @Override
                public void run() {
                    getServices();
                }
            });
            workerThread.start();
            try{
                workerThread.join();
                System.out.println("joined thread");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            byte[] data = descriptor.getValue();
            System.out.print("data buffer updated: ");
            for (int i = 0; i < data.length; i++) {
                System.out.print(data[i]);
            }
            System.out.println();
        }

        public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            System.out.println("in read");
            if (status == BluetoothGatt.GATT_SUCCESS) {
                System.out.println("UUID: " + characteristic.getUuid());
                byte[] data = characteristic.getValue();
                System.out.println("reading");
                for (byte temp : data) {
                    System.out.print(temp);
                }
            }
        }

        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status){
            System.out.println("in write");
            if (status == BluetoothGatt.GATT_SUCCESS) {
                System.out.println("UUID: " + characteristic.getUuid());
                byte[] data = characteristic.getValue();
                System.out.println("reading in write mode");
                System.out.println(new String(data));
            }
        }
    };

    void discoverServices() {
        System.out.println("discovering services");
        bluetoothGatt.discoverServices();
    }

    void getServices() {
        System.out.println("getting services");
        services = bluetoothGatt.getServices();
        System.out.println("number of services: " + services.size());
        for (BluetoothGattService service : services) {
            List<BluetoothGattCharacteristic> characteristics = service.getCharacteristics();
            System.out.println("service uuid: " + service.getUuid().toString());
            for (BluetoothGattCharacteristic characteristic : characteristics){
                    System.out.println("characteristic uuid: " + characteristic.getUuid().toString());

                    bluetoothGatt.setCharacteristicNotification(characteristic, true);
                    for (BluetoothGattDescriptor descriptor : characteristic.getDescriptors()) {
                        descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
                    }
                    bluetoothGatt.readCharacteristic(characteristic);
            }
        }
        System.out.println("got all services");
    }
}

Answer 1

Вам нужно выяснить, где проблема.

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