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   1 /*
   2  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package org.altusmetrum.AltosDroid;
  19
  20 import java.lang.ref.WeakReference;
  21 import java.util.ArrayList;
  22 import java.util.concurrent.TimeoutException;
  23 import java.util.Timer;
  24 import java.util.TimerTask;
  25
  26 import android.app.Notification;
  27 //import android.app.NotificationManager;
  28 import android.app.PendingIntent;
  29 import android.app.Service;
  30 import android.bluetooth.BluetoothDevice;
  31 import android.content.Intent;
  32 import android.content.Context;
  33 import android.os.Bundle;
  34 import android.os.IBinder;
  35 import android.os.Handler;
  36 import android.os.Message;
  37 import android.os.Messenger;
  38 import android.os.RemoteException;
  39 import android.os.Looper;
  40 import android.util.Log;
  41 import android.widget.Toast;
  42 import android.location.Location;
  43 import android.location.LocationManager;
  44 import android.location.LocationListener;
  45 import android.location.Criteria;
  46
  47 import org.altusmetrum.altoslib_5.*;
  48
  49
  50 public class TelemetryService extends Service implements LocationListener {
  51
  52         private static final String TAG = "TelemetryService";
  53         private static final boolean D = true;
  54
  55         static final int MSG_REGISTER_CLIENT   = 1;
  56         static final int MSG_UNREGISTER_CLIENT = 2;
  57         static final int MSG_CONNECT           = 3;
  58         static final int MSG_CONNECTED         = 4;
  59         static final int MSG_CONNECT_FAILED    = 5;
  60         static final int MSG_DISCONNECTED      = 6;
  61         static final int MSG_TELEMETRY         = 7;
  62         static final int MSG_SETFREQUENCY      = 8;
  63         static final int MSG_CRC_ERROR         = 9;
  64         static final int MSG_SETBAUD           = 10;
  65
  66         public static final int STATE_NONE       = 0;
  67         public static final int STATE_READY      = 1;
  68         public static final int STATE_CONNECTING = 2;
  69         public static final int STATE_CONNECTED  = 3;
  70
  71         // Unique Identification Number for the Notification.
  72         // We use it on Notification start, and to cancel it.
  73         private int NOTIFICATION = R.string.telemetry_service_label;
  74         //private NotificationManager mNM;
  75
  76         // Timer - we wake up every now and then to decide if the service should stop
  77         private Timer timer = new Timer();
  78
  79         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  80         final Handler   mHandler   = new IncomingHandler(this);
  81         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  82
  83         // Name of the connected device
  84         private BluetoothDevice device           = null;
  85         private AltosBluetooth  mAltosBluetooth  = null;
  86         private AltosConfigData mConfigData      = null;
  87         private TelemetryReader mTelemetryReader = null;
  88         private TelemetryLogger mTelemetryLogger = null;
  89
  90         // internally track state of bluetooth connection
  91         private int state = STATE_NONE;
  92
  93         // Last data seen; send to UI when it starts
  94
  95         private AltosState last_state;
  96         private Location last_location;
  97         private int last_crc_errors;
  98
  99         // Handler of incoming messages from clients.
 100         static class IncomingHandler extends Handler {
 101                 private final WeakReference<TelemetryService> service;
 102                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
 103
 104                 @Override
 105                 public void handleMessage(Message msg) {
 106                         TelemetryService s = service.get();
 107                         switch (msg.what) {
 108                         case MSG_REGISTER_CLIENT:
 109                                 s.mClients.add(msg.replyTo);
 110                                 try {
 111                                         // Now we try to send the freshly connected UI any relavant information about what
 112                                         // we're talking to - Basically state and Config Data.
 113                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
 114                                         // We also send any recent telemetry or location data that's cached
 115                                         if (s.last_state      != null) msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_TELEMETRY, s.last_state     ));
 116                                         if (s.last_location   != null) msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_LOCATION , s.last_location  ));
 117                                         if (s.last_crc_errors != 0   ) msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_CRC_ERROR, s.last_crc_errors));
 118                                 } catch (RemoteException e) {
 119                                         s.mClients.remove(msg.replyTo);
 120                                 }
 121                                 if (D) Log.d(TAG, "Client bound to service");
 122                                 break;
 123                         case MSG_UNREGISTER_CLIENT:
 124                                 s.mClients.remove(msg.replyTo);
 125                                 if (D) Log.d(TAG, "Client unbound from service");
 126                                 break;
 127                         case MSG_CONNECT:
 128                                 if (D) Log.d(TAG, "Connect command received");
 129                                 s.device = (BluetoothDevice) msg.obj;
 130                                 s.startAltosBluetooth();
 131                                 break;
 132                         case MSG_CONNECTED:
 133                                 if (D) Log.d(TAG, "Connected to device");
 134                                 s.connected();
 135                                 break;
 136                         case MSG_CONNECT_FAILED:
 137                                 if (D) Log.d(TAG, "Connection failed... retrying");
 138                                 s.startAltosBluetooth();
 139                                 break;
 140                         case MSG_DISCONNECTED:
 141                                 // Only do the following if we haven't been shutdown elsewhere..
 142                                 if (s.device != null) {
 143                                         if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 144                                         s.stopAltosBluetooth();
 145                                 }
 146                                 break;
 147                         case MSG_TELEMETRY:
 148                                 // forward telemetry messages
 149                                 s.last_state = (AltosState) msg.obj;
 150                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 151                                 break;
 152                         case MSG_CRC_ERROR:
 153                                 // forward crc error messages
 154                                 s.last_crc_errors = (Integer) msg.obj;
 155                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_CRC_ERROR, msg.obj));
 156                                 break;
 157                         case MSG_SETFREQUENCY:
 158                                 if (s.state == STATE_CONNECTED) {
 159                                         try {
 160                                                 s.mAltosBluetooth.set_radio_frequency((Double) msg.obj);
 161                                         } catch (InterruptedException e) {
 162                                         } catch (TimeoutException e) {
 163                                         }
 164                                 }
 165                                 break;
 166                         case MSG_SETBAUD:
 167                                 if (s.state == STATE_CONNECTED) {
 168                                         s.mAltosBluetooth.set_telemetry_rate((Integer) msg.obj);
 169                                 }
 170                                 break;
 171                         default:
 172                                 super.handleMessage(msg);
 173                         }
 174                 }
 175         }
 176
 177         private void sendMessageToClients(Message m) {
 178                 for (int i=mClients.size()-1; i>=0; i--) {
 179                         try {
 180                                 mClients.get(i).send(m);
 181                         } catch (RemoteException e) {
 182                                 mClients.remove(i);
 183                         }
 184                 }
 185         }
 186
 187         private void stopAltosBluetooth() {
 188                 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
 189                 setState(STATE_READY);
 190                 if (mTelemetryReader != null) {
 191                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
 192                         mTelemetryReader.interrupt();
 193                         try {
 194                                 mTelemetryReader.join();
 195                         } catch (InterruptedException e) {
 196                         }
 197                         mTelemetryReader = null;
 198                 }
 199                 if (mTelemetryLogger != null) {
 200                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryLogger");
 201                         mTelemetryLogger.stop();
 202                         mTelemetryLogger = null;
 203                 }
 204                 if (mAltosBluetooth != null) {
 205                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
 206                         mAltosBluetooth.close();
 207                         mAltosBluetooth = null;
 208                 }
 209                 device = null;
 210                 mConfigData = null;
 211         }
 212
 213         private void startAltosBluetooth() {
 214                 if (device == null) {
 215                         return;
 216                 }
 217                 if (mAltosBluetooth == null) {
 218                         if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
 219                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 220                         setState(STATE_CONNECTING);
 221                 } else {
 222                         // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
 223                         // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
 224                         // to ourselves in a few seconds time that will ultimately call this method again.
 225                         // ... then we tear down the existing connection.
 226                         // We do it this way around so that we don't lose a reference to the device when this method
 227                         // is called on reception of MSG_CONNECT_FAILED in the handler above.
 228                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
 229                         stopAltosBluetooth();
 230                 }
 231         }
 232
 233         private synchronized void setState(int s) {
 234                 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
 235                 state = s;
 236
 237                 // This shouldn't be required - mConfigData should be null for any non-connected
 238                 // state, but to be safe and to reduce message size
 239                 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
 240
 241                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
 242         }
 243
 244         private void connected() {
 245                 try {
 246                         if (mAltosBluetooth == null)
 247                                 throw new InterruptedException("no bluetooth");
 248                         mConfigData = mAltosBluetooth.config_data();
 249                 } catch (InterruptedException e) {
 250                 } catch (TimeoutException e) {
 251                         // If this timed out, then we really want to retry it, but
 252                         // probably safer to just retry the connection from scratch.
 253                         mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 254                         return;
 255                 }
 256
 257                 setState(STATE_CONNECTED);
 258
 259                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 260                 mTelemetryReader.start();
 261
 262                 mTelemetryLogger = new TelemetryLogger(this, mAltosBluetooth);
 263         }
 264
 265
 266         private void onTimerTick() {
 267                 if (D) Log.d(TAG, "Timer wakeup");
 268                 try {
 269                         if (mClients.size() <= 0 && state != STATE_CONNECTED) {
 270                                 stopSelf();
 271                         }
 272                 } catch (Throwable t) {
 273                         Log.e(TAG, "Timer failed: ", t);
 274                 }
 275         }
 276
 277
 278         @Override
 279         public void onCreate() {
 280                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 281                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 282
 283                 setState(STATE_READY);
 284
 285                 // Start our timer - first event in 10 seconds, then every 10 seconds after that.
 286                 timer.scheduleAtFixedRate(new TimerTask(){ public void run() {onTimerTick();}}, 10000L, 10000L);
 287
 288                 // Listen for GPS and Network position updates
 289                 LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
 290
 291                 locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, this);
 292 //              locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
 293         }
 294
 295         @Override
 296         public int onStartCommand(Intent intent, int flags, int startId) {
 297                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 298
 299                 CharSequence text = getText(R.string.telemetry_service_started);
 300
 301                 // Create notification to be displayed while the service runs
 302                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 303
 304                 // The PendingIntent to launch our activity if the user selects this notification
 305                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 306                                 new Intent(this, AltosDroid.class), 0);
 307
 308                 // Set the info for the views that show in the notification panel.
 309                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 310
 311                 // Set the notification to be in the "Ongoing" section.
 312                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 313
 314                 // Move us into the foreground.
 315                 startForeground(NOTIFICATION, notification);
 316
 317                 // We want this service to continue running until it is explicitly
 318                 // stopped, so return sticky.
 319                 return START_STICKY;
 320         }
 321
 322         @Override
 323         public void onDestroy() {
 324
 325                 // Stop listening for location updates
 326                 ((LocationManager) getSystemService(Context.LOCATION_SERVICE)).removeUpdates(this);
 327
 328                 // Stop the bluetooth Comms threads
 329                 stopAltosBluetooth();
 330
 331                 // Demote us from the foreground, and cancel the persistent notification.
 332                 stopForeground(true);
 333
 334                 // Stop our timer
 335                 if (timer != null) {timer.cancel();}
 336
 337                 // Tell the user we stopped.
 338                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 339         }
 340
 341         @Override
 342         public IBinder onBind(Intent intent) {
 343                 return mMessenger.getBinder();
 344         }
 345
 346
 347         public void onLocationChanged(Location location) {
 348                 last_location = location;
 349                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_LOCATION, location));
 350         }
 351
 352         public void onStatusChanged(String provider, int status, Bundle extras) {
 353         }
 354
 355         public void onProviderEnabled(String provider) {
 356         }
 357
 358         public void onProviderDisabled(String provider) {
 359         }
 360
 361 }