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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, "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                                         if (D) Log.e(TAG, "ConnectThread: Failed to establish connection");
 105                                         return;
 106                                 }
 107
 108                                 // Configure the newly connected device for telemetry
 109                                 print("~\nE 0\n");
 110                                 set_monitor(false);
 111
 112                                 // Reset the ConnectThread because we're done
 113                                 connect_thread = null;
 114
 115                                 // Notify other waiting threads, now that we're connected
 116                                 AltosBluetooth.this.notifyAll();
 117
 118                                 if (D) Log.i(TAG, "ConnectThread: Connect completed");
 119                         }
 120                 }
 121
 122                 public void cancel() {
 123                         try {
 124                                 if (socket != null)
 125                                         socket.close();
 126                         } catch (IOException e) {
 127                                 if (D) Log.e(TAG, "ConnectThread: close() of connect socket failed", e);
 128                         }
 129                 }
 130         }
 131
 132         private synchronized void wait_connected() throws InterruptedException, IOException {
 133                 if (D) Log.i(TAG, "wait_connected(): begin");
 134                 if (input == null) {
 135                         if (D) Log.i(TAG, "wait_connected(): waiting");
 136                         wait();
 137                         if (D) Log.i(TAG, "wait_connected(): wait ended..");
 138                         if (input == null) throw new IOException();
 139                 }
 140         }
 141
 142         private void connection_failed() {
 143                 if (D) Log.e(TAG, "Bluetooth Socket IO failed!");
 144         }
 145
 146         public void print(String data) {
 147                 byte[] bytes = data.getBytes();
 148                 if (D) Log.i(TAG, "print(): begin");
 149                 try {
 150                         wait_connected();
 151                         output.write(bytes);
 152                         if (D) Log.i(TAG, "print(): Wrote bytes: '" + data.replace('\n', '\\') + "'");
 153                 } catch (IOException e) {
 154                         connection_failed();
 155                 } catch (InterruptedException e) {
 156                         connection_failed();
 157                 }
 158         }
 159
 160         public int getchar() {
 161                 if (D) Log.i(TAG, "getchar(): begin");
 162                 try {
 163                         wait_connected();
 164                         if (D) Log.i(TAG, "getchar(): proceeding");
 165                         return input.read();
 166                 } catch (IOException e) {
 167                         connection_failed();
 168                 } catch (java.lang.InterruptedException e) {
 169                         connection_failed();
 170                 }
 171                 return AltosLink.ERROR;
 172         }
 173
 174         public void close() {
 175                 if (D) Log.i(TAG, "close(): begin");
 176                 synchronized(this) {
 177                         if (D) Log.i(TAG, "close(): synched");
 178
 179                         if (connect_thread != null) {
 180                                 if (D) Log.i(TAG, "close(): stopping connect_thread");
 181                                 connect_thread.cancel();
 182                                 connect_thread = null;
 183                         }
 184                         if (D) Log.i(TAG, "close(): Closing socket");
 185                         try {
 186                                 socket.close();
 187                         } catch (IOException e) {
 188                                 if (D) Log.e(TAG, "close(): unable to close() socket");
 189                         }
 190                         if (input_thread != null) {
 191                                 if (D) Log.i(TAG, "close(): stopping input_thread");
 192                                 try {
 193                                         if (D) Log.i(TAG, "close(): input_thread.interrupt().....");
 194                                         input_thread.interrupt();
 195                                         if (D) Log.i(TAG, "close(): input_thread.join().....");
 196                                         input_thread.join();
 197                                 } catch (Exception e) {}
 198                                 input_thread = null;
 199                         }
 200                         input = null;
 201                         output = null;
 202                         notifyAll();
 203                 }
 204         }
 205
 206
 207         //public void flush_output() { super.flush_output(); }
 208
 209         public boolean can_cancel_reply()   { return false; }
 210         public boolean show_reply_timeout() { return true; }
 211         public void hide_reply_timeout()    { }
 212
 213 }