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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.Bundle;
  30 import android.os.Handler;
  31 //import android.os.Message;
  32 import android.util.Log;
  33
  34 import org.altusmetrum.altoslib_5.*;
  35
  36 public class AltosBluetooth extends AltosLink {
  37
  38         // Debugging
  39         private static final String TAG = "AltosBluetooth";
  40         private static final boolean D = true;
  41
  42         private ConnectThread    connect_thread = null;
  43         private Thread           input_thread   = null;
  44
  45         private Handler          handler;
  46
  47         private BluetoothAdapter adapter;
  48         private BluetoothDevice  device;
  49         private BluetoothSocket  socket;
  50         private InputStream      input;
  51         private OutputStream     output;
  52
  53         // Constructor
  54         public AltosBluetooth(BluetoothDevice in_device, Handler in_handler) {
  55                 adapter = BluetoothAdapter.getDefaultAdapter();
  56                 device = in_device;
  57                 handler = in_handler;
  58
  59                 connect_thread = new ConnectThread(device);
  60                 connect_thread.start();
  61
  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.d(TAG, "ConnectThread: BEGIN");
  80                         setName("ConnectThread");
  81
  82                         // Always cancel discovery because it will slow down a connection
  83                         adapter.cancelDiscovery();
  84
  85                         synchronized (AltosBluetooth.this) {
  86                                 // Make a connection to the BluetoothSocket
  87                                 try {
  88                                         // This is a blocking call and will only return on a
  89                                         // successful connection or an exception
  90                                         socket.connect();
  91
  92                                         input = socket.getInputStream();
  93                                         output = socket.getOutputStream();
  94                                 } catch (IOException e) {
  95                                         // Close the socket
  96                                         try {
  97                                                 socket.close();
  98                                         } catch (IOException e2) {
  99                                                 if (D) Log.e(TAG, "ConnectThread: Failed to close() socket after failed connection");
 100                                         }
 101                                         input = null;
 102                                         output = null;
 103                                         AltosBluetooth.this.notifyAll();
 104                                         handler.obtainMessage(TelemetryService.MSG_CONNECT_FAILED).sendToTarget();
 105                                         if (D) Log.e(TAG, "ConnectThread: Failed to establish connection");
 106                                         return;
 107                                 }
 108
 109                                 input_thread = new Thread(AltosBluetooth.this);
 110                                 input_thread.start();
 111
 112                                 // Configure the newly connected device for telemetry
 113                                 print("~\nE 0\n");
 114                                 set_monitor(false);
 115
 116                                 // Let TelemetryService know we're connected
 117                                 handler.obtainMessage(TelemetryService.MSG_CONNECTED).sendToTarget();
 118
 119                                 // Notify other waiting threads, now that we're connected
 120                                 AltosBluetooth.this.notifyAll();
 121
 122                                 // Reset the ConnectThread because we're done
 123                                 connect_thread = null;
 124
 125                                 if (D) Log.d(TAG, "ConnectThread: Connect completed");
 126                         }
 127                 }
 128
 129                 public void cancel() {
 130                         try {
 131                                 if (socket != null)
 132                                         socket.close();
 133                         } catch (IOException e) {
 134                                 if (D) Log.e(TAG, "ConnectThread: close() of connect socket failed", e);
 135                         }
 136                 }
 137         }
 138
 139         private synchronized void wait_connected() throws InterruptedException, IOException {
 140                 if (input == null) {
 141                         wait();
 142                         if (input == null) throw new IOException();
 143                 }
 144         }
 145
 146         private void connection_lost() {
 147                 if (D) Log.e(TAG, "Connection lost during I/O");
 148                 handler.obtainMessage(TelemetryService.MSG_DISCONNECTED).sendToTarget();
 149         }
 150
 151         public void print(String data) {
 152                 byte[] bytes = data.getBytes();
 153                 if (D) Log.d(TAG, "print(): begin");
 154                 try {
 155                         wait_connected();
 156                         output.write(bytes);
 157                         if (D) Log.d(TAG, "print(): Wrote bytes: '" + data.replace('\n', '\\') + "'");
 158                 } catch (IOException e) {
 159                         connection_lost();
 160                 } catch (InterruptedException e) {
 161                         connection_lost();
 162                 }
 163         }
 164
 165         public void putchar(byte c) {
 166                 byte[] bytes = { c };
 167                 if (D) Log.d(TAG, "print(): begin");
 168                 try {
 169                         wait_connected();
 170                         output.write(bytes);
 171                         if (D) Log.d(TAG, "print(): Wrote byte: '" + c + "'");
 172                 } catch (IOException e) {
 173                         connection_lost();
 174                 } catch (InterruptedException e) {
 175                         connection_lost();
 176                 }
 177         }
 178
 179         private static final int buffer_size = 1024;
 180
 181         private byte[] buffer = new byte[buffer_size];
 182         private int buffer_len = 0;
 183         private int buffer_off = 0;
 184
 185         public int getchar() {
 186                 while (buffer_off == buffer_len) {
 187                         try {
 188                                 wait_connected();
 189                                 buffer_len = input.read(buffer);
 190                                 buffer_off = 0;
 191                         } catch (IOException e) {
 192                                 connection_lost();
 193                                 return AltosLink.ERROR;
 194                         } catch (java.lang.InterruptedException e) {
 195                                 connection_lost();
 196                                 return AltosLink.ERROR;
 197                         }
 198                 }
 199                 return buffer[buffer_off++];
 200         }
 201
 202         public void close() {
 203                 if (D) Log.d(TAG, "close(): begin");
 204                 synchronized(this) {
 205                         if (D) Log.d(TAG, "close(): synched");
 206
 207                         if (connect_thread != null) {
 208                                 if (D) Log.d(TAG, "close(): stopping connect_thread");
 209                                 connect_thread.cancel();
 210                                 connect_thread = null;
 211                         }
 212                         if (D) Log.d(TAG, "close(): Closing socket");
 213                         try {
 214                                 socket.close();
 215                         } catch (IOException e) {
 216                                 if (D) Log.e(TAG, "close(): unable to close() socket");
 217                         }
 218                         if (input_thread != null) {
 219                                 if (D) Log.d(TAG, "close(): stopping input_thread");
 220                                 try {
 221                                         if (D) Log.d(TAG, "close(): input_thread.interrupt().....");
 222                                         input_thread.interrupt();
 223                                         if (D) Log.d(TAG, "close(): input_thread.join().....");
 224                                         input_thread.join();
 225                                 } catch (Exception e) {}
 226                                 input_thread = null;
 227                         }
 228                         input = null;
 229                         output = null;
 230                         notifyAll();
 231                 }
 232         }
 233
 234
 235         // We override this method so that we can add some debugging. Not 100% elegant, but more useful
 236         // than debugging one char at a time above in getchar()!
 237         public void add_reply(AltosLine line) throws InterruptedException {
 238                 if (D) Log.d(TAG, String.format("Got REPLY: %s", line.line));
 239                 super.add_reply(line);
 240         }
 241
 242         //public void flush_output() { super.flush_output(); }
 243
 244         // Stubs of required methods when extending AltosLink
 245         public boolean can_cancel_reply()   { return false; }
 246         public boolean show_reply_timeout() { return true; }
 247         public void hide_reply_timeout()    { }
 248
 249 }