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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.car.obd2.connections;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.util.Log;
import com.android.car.obd2.Obd2Connection;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Objects;
import java.util.UUID;
public class BluetoothConnection implements Obd2Connection.UnderlyingTransport {
/**
* This is the well-known UUID for the Bluetooth SPP (Serial Port Profile)
*/
private static final UUID SERIAL_PORT_PROFILE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private final BluetoothDevice mDevice;
private BluetoothSocket mSocket = null;
public static final String TAG = BluetoothConnection.class.getSimpleName();
public BluetoothConnection(String bluetoothAddress) {
this(BluetoothAdapter.getDefaultAdapter().getRemoteDevice(bluetoothAddress));
}
public BluetoothConnection(BluetoothDevice device) {
mDevice = Objects.requireNonNull(device);
connect();
}
@Override
public String getAddress() {
return mDevice.getAddress();
}
/**
* Establish an RFCOMM connection to the remote device.
*
* Assumes there is no existing connection.
*
* This method may take time to return (or even not return in pathological cases).
* It is a good idea to wrap it in some kind of Promise-like object.
*
* @return true if it could connect, false otherwise
*/
private boolean connect() {
try {
mSocket = mDevice.createRfcommSocketToServiceRecord(SERIAL_PORT_PROFILE);
mSocket.connect();
} catch (IOException e) {
Log.w(TAG, "BluetoothConnection couldn't be established due to an exception: " + e);
mSocket = null;
return false;
}
return mSocket.isConnected();
}
@Override
public boolean isConnected() {
return mSocket != null && mSocket.isConnected();
}
private void close() {
if (isConnected()) {
try {
mSocket.close();
} catch (IOException e) {
// we are letting go of the connection anyway, so log and continue
Log.w(TAG, "IOException during BluetoothSocket close(): " + e);
} finally {
mSocket = null;
}
}
}
@Override
public boolean reconnect() {
close();
return connect();
}
@Override
public InputStream getInputStream() {
if (isConnected()) {
try {
return mSocket.getInputStream();
} catch (IOException e) {
Log.w(TAG, "failed to get Bluetooth input stream: " + e);
}
}
return null;
}
@Override
public OutputStream getOutputStream() {
if (isConnected()) {
try {
return mSocket.getOutputStream();
} catch (IOException e) {
Log.w(TAG, "failed to get Bluetooth output stream: " + e);
}
}
return null;
}
}
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