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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.util.Log;
  30
  31 import org.altusmetrum.AltosLib.*;
  32
  33 public class AltosBluetooth extends AltosLink {
  34
  35         // Debugging
  36         private static final String TAG = "AltosBluetooth";
  37         private static final boolean D = true;
  38
  39         private ConnectThread    connect_thread = null;
  40         private Thread           input_thread   = null;
  41
  42         private BluetoothAdapter adapter;
  43         private BluetoothDevice  device;
  44         private BluetoothSocket  socket;
  45         private InputStream      input;
  46         private OutputStream     output;
  47
  48         // Constructor
  49         public AltosBluetooth(BluetoothDevice in_device) {
  50                 adapter = BluetoothAdapter.getDefaultAdapter();
  51                 device = in_device;
  52
  53                 connect_thread = new ConnectThread(device);
  54                 connect_thread.start();
  55
  56                 input_thread = new Thread(this);
  57                 input_thread.start();
  58         }
  59
  60         private class ConnectThread extends Thread {
  61                 private final UUID SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
  62
  63                 public ConnectThread(BluetoothDevice device) {
  64                         BluetoothSocket tmp_socket = null;
  65
  66                         try {
  67                                 tmp_socket = device.createInsecureRfcommSocketToServiceRecord(SPP_UUID);
  68                         } catch (IOException e) {
  69                                 e.printStackTrace();
  70                         }
  71                         socket = tmp_socket;
  72                 }
  73
  74                 public void run() {
  75                         if (D) Log.i(TAG, "BEGIN ConnectThread");
  76                         setName("ConnectThread");
  77
  78                         // Always cancel discovery because it will slow down a connection
  79                         adapter.cancelDiscovery();
  80
  81                         // Make a connection to the BluetoothSocket
  82                         try {
  83                                 // This is a blocking call and will only return on a
  84                                 // successful connection or an exception
  85                                 socket.connect();
  86                         } catch (IOException e) {
  87                                 // Close the socket
  88                                 try {
  89                                         socket.close();
  90                                 } catch (IOException e2) {
  91                                         if (D) Log.e(TAG, "unable to close() socket during connection failure", e2);
  92                                 }
  93                                 connection_failed();
  94                                 return;
  95                         }
  96
  97                         try {
  98                                 synchronized (AltosBluetooth.this) {
  99                                         input = socket.getInputStream();
 100                                         output = socket.getOutputStream();
 101
 102                                         // Configure the newly connected device for telemetry
 103                                         print("~\nE 0\n");
 104                                         set_monitor(false);
 105
 106                                         // Reset the ConnectThread because we're done
 107                                         AltosBluetooth.this.notify();
 108                                         connect_thread = null;
 109                                         if (D) Log.i(TAG, "Completed connect");
 110                                 }
 111                         } catch (Exception e) {
 112                                 if (D) Log.e(TAG, "Failed to finish connection", e);
 113                                 e.printStackTrace();
 114                         }
 115                 }
 116
 117                 public void cancel() {
 118                         try {
 119                                 if (socket != null)
 120                                         socket.close();
 121                         } catch (IOException e) {
 122                                 if (D) Log.e(TAG, "close() of connect socket failed", e);
 123                         }
 124                 }
 125         }
 126
 127         private synchronized void wait_connected() throws InterruptedException {
 128                 if (input == null) {
 129                         wait();
 130                 }
 131         }
 132
 133         private void connection_failed() {
 134                 if (D) Log.i(TAG, "Bluetooth Connection failed!");
 135         }
 136
 137         public void print(String data) {
 138                 byte[] bytes = data.getBytes();
 139                 try {
 140                         if (D) Log.i(TAG, "Entering print();");
 141                         wait_connected();
 142                         output.write(bytes);
 143                         if (D) Log.i(TAG, "Writing bytes: '" + data + "'");
 144                 } catch (IOException e) {
 145                         connection_failed();
 146                 } catch (InterruptedException e) {
 147                         connection_failed();
 148                 }
 149         }
 150
 151         public int getchar() {
 152                 try {
 153                         wait_connected();
 154                         return input.read();
 155                 } catch (IOException e) {
 156                         connection_failed();
 157                 } catch (java.lang.InterruptedException e) {
 158                         connection_failed();
 159                 }
 160                 return AltosLink.ERROR;
 161         }
 162
 163         public void close() {
 164                 synchronized(this) {
 165                         if (connect_thread != null) {
 166                                 connect_thread.cancel();
 167                                 connect_thread = null;
 168                         }
 169                         if (input_thread != null) {
 170                                 try {
 171                                         input_thread.interrupt();
 172                                         input_thread.join();
 173                                 } catch (Exception e) {}
 174                                 input_thread = null;
 175                         }
 176                 }
 177         }
 178
 179
 180         //public void flush_output() { super.flush_output(); }
 181
 182         public boolean can_cancel_reply()   { return false; }
 183         public boolean show_reply_timeout() { return true; }
 184         public void hide_reply_timeout()    { }
 185
 186 }