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   1 /*
   2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
   3  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 package org.altusmetrum.AltosDroid;
  20
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.io.OutputStream;
  24 import java.util.UUID;
  25
  26 import android.bluetooth.BluetoothAdapter;
  27 import android.bluetooth.BluetoothDevice;
  28 import android.bluetooth.BluetoothSocket;
  29 import android.os.Handler;
  30 import android.util.Log;
  31
  32 import org.altusmetrum.AltosLib.*;
  33
  34 public class AltosBluetooth extends AltosLink {
  35
  36         // Debugging
  37         private static final String TAG = "AltosBluetooth";
  38         private static final boolean D = true;
  39
  40         private ConnectThread    connect_thread = null;
  41         private Thread           input_thread   = null;
  42
  43         private Handler          handler;
  44
  45         private BluetoothAdapter adapter;
  46         private BluetoothDevice  device;
  47         private BluetoothSocket  socket;
  48         private InputStream      input;
  49         private OutputStream     output;
  50
  51         // Constructor
  52         public AltosBluetooth(BluetoothDevice in_device, Handler in_handler) {
  53                 adapter = BluetoothAdapter.getDefaultAdapter();
  54                 device = in_device;
  55                 handler = in_handler;
  56
  57                 connect_thread = new ConnectThread(device);
  58                 connect_thread.start();
  59
  60                 input_thread = new Thread(this);
  61                 input_thread.start();
  62         }
  63
  64         private class ConnectThread extends Thread {
  65                 private final UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
  66
  67                 public ConnectThread(BluetoothDevice device) {
  68                         BluetoothSocket tmp_socket = null;
  69
  70                         try {
  71                                 tmp_socket = device.createInsecureRfcommSocketToServiceRecord(SPP_UUID);
  72                         } catch (IOException e) {
  73                                 e.printStackTrace();
  74                         }
  75                         socket = tmp_socket;
  76                 }
  77
  78                 public void run() {
  79                         if (D) Log.i(TAG, "BEGIN ConnectThread");
  80                         setName("ConnectThread");
  81
  82                         // Always cancel discovery because it will slow down a connection
  83                         adapter.cancelDiscovery();
  84
  85                         // Make a connection to the BluetoothSocket
  86                         try {
  87                                 // This is a blocking call and will only return on a
  88                                 // successful connection or an exception
  89                                 socket.connect();
  90                         } catch (IOException e) {
  91                                 // Close the socket
  92                                 try {
  93                                         socket.close();
  94                                 } catch (IOException e2) {
  95                                         if (D) Log.e(TAG, "unable to close() socket during connection failure", e2);
  96                                 }
  97                                 connection_failed();
  98                                 return;
  99                         }
 100
 101                         try {
 102                                 synchronized (AltosBluetooth.this) {
 103                                         input = socket.getInputStream();
 104                                         output = socket.getOutputStream();
 105
 106                                         // Configure the newly connected device for telemetry
 107                                         print("~\nE 0\n");
 108                                         set_monitor(false);
 109
 110                                         // Reset the ConnectThread because we're done
 111                                         AltosBluetooth.this.notify();
 112                                         connect_thread = null;
 113                                         if (D) Log.i(TAG, "Completed connect");
 114                                 }
 115                         } catch (Exception e) {
 116                                 if (D) Log.e(TAG, "Failed to finish connection", e);
 117                                 e.printStackTrace();
 118                         }
 119                 }
 120
 121                 public void cancel() {
 122                         try {
 123                                 if (socket != null)
 124                                         socket.close();
 125                         } catch (IOException e) {
 126                                 if (D) Log.e(TAG, "close() of connect socket failed", e);
 127                         }
 128                 }
 129         }
 130
 131         private synchronized void wait_connected() throws InterruptedException {
 132                 if (input == null) {
 133                         wait();
 134                 }
 135         }
 136
 137         private void connection_failed() {
 138                 if (D) Log.i(TAG, "Bluetooth Connection failed!");
 139         }
 140
 141         public void print(String data) {
 142                 byte[] bytes = data.getBytes();
 143                 try {
 144                         if (D) Log.i(TAG, "Entering print();");
 145                         wait_connected();
 146                         output.write(bytes);
 147                         if (D) Log.i(TAG, "Writing bytes: '" + data + "'");
 148                 } catch (IOException e) {
 149                         connection_failed();
 150                 } catch (InterruptedException e) {
 151                         connection_failed();
 152                 }
 153         }
 154
 155         public int getchar() {
 156                 try {
 157                         wait_connected();
 158                         return input.read();
 159                 } catch (IOException e) {
 160                         connection_failed();
 161                 } catch (java.lang.InterruptedException e) {
 162                         connection_failed();
 163                 }
 164                 return AltosLink.ERROR;
 165         }
 166
 167         public void close() {
 168                 synchronized(this) {
 169                         if (connect_thread != null) {
 170                                 connect_thread.cancel();
 171                                 connect_thread = null;
 172                         }
 173                         if (input_thread != null) {
 174                                 try {
 175                                         input_thread.interrupt();
 176                                         input_thread.join();
 177                                 } catch (Exception e) {}
 178                                 input_thread = null;
 179                         }
 180                 }
 181         }
 182
 183
 184         //public void flush_output() { super.flush_output(); }
 185
 186         public boolean can_cancel_reply()   { return false; }
 187         public boolean show_reply_timeout() { return true; }
 188         public void hide_reply_timeout()    { }
 189
 190 }