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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; either version 2 of the License, or
   7  * (at your option) any later version.
   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.lang.ref.WeakReference;
  22 import java.util.concurrent.TimeoutException;
  23 import java.util.*;
  24
  25 import android.app.*;
  26 import android.bluetooth.BluetoothDevice;
  27 import android.bluetooth.BluetoothAdapter;
  28 import android.graphics.Color;
  29 import android.hardware.usb.*;
  30 import android.content.Intent;
  31 import android.content.Context;
  32 import android.os.*;
  33 import android.widget.Toast;
  34
  35 import org.altusmetrum.altoslib_13.*;
  36
  37 public class TelemetryService extends Service implements AltosIdleMonitorListener {
  38
  39         static final int MSG_REGISTER_CLIENT   = 1;
  40         static final int MSG_UNREGISTER_CLIENT = 2;
  41         static final int MSG_CONNECT           = 3;
  42         static final int MSG_OPEN_USB          = 4;
  43         static final int MSG_CONNECTED         = 5;
  44         static final int MSG_CONNECT_FAILED    = 6;
  45         static final int MSG_DISCONNECTED      = 7;
  46         static final int MSG_TELEMETRY         = 8;
  47         static final int MSG_SETFREQUENCY      = 9;
  48         static final int MSG_CRC_ERROR         = 10;
  49         static final int MSG_SETBAUD           = 11;
  50         static final int MSG_DISCONNECT        = 12;
  51         static final int MSG_DELETE_SERIAL     = 13;
  52         static final int MSG_BLUETOOTH_ENABLED = 14;
  53         static final int MSG_MONITOR_IDLE_START= 15;
  54         static final int MSG_MONITOR_IDLE_STOP = 16;
  55         static final int MSG_REBOOT            = 17;
  56         static final int MSG_IGNITER_QUERY     = 18;
  57         static final int MSG_IGNITER_FIRE      = 19;
  58
  59         // Unique Identification Number for the Notification.
  60         // We use it on Notification start, and to cancel it.
  61         private int NOTIFICATION = R.string.telemetry_service_label;
  62         //private NotificationManager mNM;
  63
  64         ArrayList<Messenger> clients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  65         final Handler   handler   = new IncomingHandler(this);
  66         final Messenger messenger = new Messenger(handler); // Target we publish for clients to send messages to IncomingHandler.
  67
  68         // Name of the connected device
  69         DeviceAddress address;
  70         private AltosDroidLink  altos_link  = null;
  71         private TelemetryReader telemetry_reader = null;
  72         private TelemetryLogger telemetry_logger = null;
  73
  74         // Local Bluetooth adapter
  75         private BluetoothAdapter bluetooth_adapter = null;
  76
  77         // Last data seen; send to UI when it starts
  78         private TelemetryState  telemetry_state;
  79
  80         // Idle monitor if active
  81         AltosIdleMonitor idle_monitor = null;
  82
  83         // Igniter bits
  84         AltosIgnite ignite = null;
  85         boolean ignite_running;
  86
  87         // Handler of incoming messages from clients.
  88         static class IncomingHandler extends Handler {
  89                 private final WeakReference<TelemetryService> service;
  90                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  91
  92                 @Override
  93                 public void handleMessage(Message msg) {
  94                         DeviceAddress address;
  95
  96                         TelemetryService s = service.get();
  97                         AltosDroidLink bt = null;
  98                         if (s == null)
  99                                 return;
 100
 101                         switch (msg.what) {
 102
 103                                 /* Messages from application */
 104                         case MSG_REGISTER_CLIENT:
 105                                 s.add_client(msg.replyTo);
 106                                 break;
 107                         case MSG_UNREGISTER_CLIENT:
 108                                 s.remove_client(msg.replyTo);
 109                                 break;
 110                         case MSG_CONNECT:
 111                                 AltosDebug.debug("Connect command received");
 112                                 address = (DeviceAddress) msg.obj;
 113                                 AltosDroidPreferences.set_active_device(address);
 114                                 s.start_altos_bluetooth(address, false);
 115                                 break;
 116                         case MSG_OPEN_USB:
 117                                 AltosDebug.debug("Open USB command received");
 118                                 UsbDevice device = (UsbDevice) msg.obj;
 119                                 s.start_usb(device);
 120                                 break;
 121                         case MSG_DISCONNECT:
 122                                 AltosDebug.debug("Disconnect command received");
 123                                 s.address = null;
 124                                 if (!(Boolean) msg.obj)
 125                                         AltosDroidPreferences.set_active_device(null);
 126                                 s.disconnect(true);
 127                                 break;
 128                         case MSG_DELETE_SERIAL:
 129                                 AltosDebug.debug("Delete Serial command received");
 130                                 s.delete_serial((Integer) msg.obj);
 131                                 break;
 132                         case MSG_SETFREQUENCY:
 133                                 AltosDebug.debug("MSG_SETFREQUENCY");
 134                                 s.telemetry_state.frequency = (Double) msg.obj;
 135                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 136                                         try {
 137                                                 s.altos_link.set_radio_frequency(s.telemetry_state.frequency);
 138                                                 s.altos_link.save_frequency();
 139                                         } catch (InterruptedException e) {
 140                                         } catch (TimeoutException e) {
 141                                         }
 142                                 }
 143                                 s.send_to_clients();
 144                                 break;
 145                         case MSG_SETBAUD:
 146                                 AltosDebug.debug("MSG_SETBAUD");
 147                                 s.telemetry_state.telemetry_rate = (Integer) msg.obj;
 148                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 149                                         s.altos_link.set_telemetry_rate(s.telemetry_state.telemetry_rate);
 150                                         s.altos_link.save_telemetry_rate();
 151                                 }
 152                                 s.send_to_clients();
 153                                 break;
 154
 155                                 /*
 156                                  *Messages from AltosBluetooth
 157                                  */
 158                         case MSG_CONNECTED:
 159                                 AltosDebug.debug("MSG_CONNECTED");
 160                                 bt = (AltosDroidLink) msg.obj;
 161
 162                                 if (bt != s.altos_link) {
 163                                         AltosDebug.debug("Stale message");
 164                                         break;
 165                                 }
 166                                 AltosDebug.debug("Connected to device");
 167                                 try {
 168                                         s.connected();
 169                                 } catch (InterruptedException ie) {
 170                                 }
 171                                 break;
 172                         case MSG_CONNECT_FAILED:
 173                                 AltosDebug.debug("MSG_CONNECT_FAILED");
 174                                 bt = (AltosDroidLink) msg.obj;
 175
 176                                 if (bt != s.altos_link) {
 177                                         AltosDebug.debug("Stale message");
 178                                         break;
 179                                 }
 180                                 if (s.address != null) {
 181                                         AltosDebug.debug("Connection failed... retrying");
 182                                         s.start_altos_bluetooth(s.address, true);
 183                                 } else {
 184                                         s.disconnect(true);
 185                                 }
 186                                 break;
 187                         case MSG_DISCONNECTED:
 188
 189                                 /* This can be sent by either AltosDroidLink or TelemetryReader */
 190                                 AltosDebug.debug("MSG_DISCONNECTED");
 191                                 bt = (AltosDroidLink) msg.obj;
 192
 193                                 if (bt != s.altos_link) {
 194                                         AltosDebug.debug("Stale message");
 195                                         break;
 196                                 }
 197                                 if (s.address != null) {
 198                                         AltosDebug.debug("Connection lost... retrying");
 199                                         s.start_altos_bluetooth(s.address, true);
 200                                 } else {
 201                                         s.disconnect(true);
 202                                 }
 203                                 break;
 204
 205                                 /*
 206                                  * Messages from TelemetryReader
 207                                  */
 208                         case MSG_TELEMETRY:
 209                                 s.telemetry((AltosTelemetry) msg.obj);
 210                                 break;
 211                         case MSG_CRC_ERROR:
 212                                 // forward crc error messages
 213                                 s.telemetry_state.crc_errors = (Integer) msg.obj;
 214                                 s.send_to_clients();
 215                                 break;
 216                         case MSG_BLUETOOTH_ENABLED:
 217                                 AltosDebug.debug("TelemetryService notes that BT is now enabled");
 218                                 address = AltosDroidPreferences.active_device();
 219                                 if (address != null && !address.address.startsWith("USB"))
 220                                         s.start_altos_bluetooth(address, false);
 221                                 break;
 222                         case MSG_MONITOR_IDLE_START:
 223                                 AltosDebug.debug("start monitor idle");
 224                                 s.start_idle_monitor();
 225                                 break;
 226                         case MSG_MONITOR_IDLE_STOP:
 227                                 AltosDebug.debug("stop monitor idle");
 228                                 s.stop_idle_monitor();
 229                                 break;
 230                         case MSG_REBOOT:
 231                                 AltosDebug.debug("reboot");
 232                                 s.reboot_remote();
 233                                 break;
 234                         case MSG_IGNITER_QUERY:
 235                                 AltosDebug.debug("igniter query");
 236                                 s.igniter_query(msg.replyTo);
 237                                 break;
 238                         case MSG_IGNITER_FIRE:
 239                                 AltosDebug.debug("igniter fire");
 240                                 s.igniter_fire((String) msg.obj);
 241                                 break;
 242                         default:
 243                                 super.handleMessage(msg);
 244                         }
 245                 }
 246         }
 247
 248         /* Handle telemetry packet
 249          */
 250         private void telemetry(AltosTelemetry telem) {
 251                 AltosState      state;
 252
 253                 if (telemetry_state.states.containsKey(telem.serial()))
 254                         state = telemetry_state.states.get(telem.serial());
 255                 else
 256                         state = new AltosState(new AltosCalData());
 257                 telem.provide_data(state);
 258                 telemetry_state.states.put(telem.serial(), state);
 259                 telemetry_state.quiet = false;
 260                 if (state != null) {
 261                         AltosPreferences.set_state(state,telem.serial());
 262                 }
 263                 send_to_clients();
 264         }
 265
 266         /* Construct the message to deliver to clients
 267          */
 268         private Message message() {
 269                 if (telemetry_state == null)
 270                         AltosDebug.debug("telemetry_state null!");
 271                 if (telemetry_state.states == null)
 272                         AltosDebug.debug("telemetry_state.states null!");
 273                 return Message.obtain(null, AltosDroid.MSG_STATE, telemetry_state);
 274         }
 275
 276         /* A new friend has connected
 277          */
 278         private void add_client(Messenger client) {
 279
 280                 clients.add(client);
 281                 AltosDebug.debug("Client bound to service");
 282
 283                 /* On connect, send the current state to the new client
 284                  */
 285                 send_to_client(client);
 286                 send_idle_mode_to_client(client);
 287
 288                 /* If we've got an address from a previous session, then
 289                  * go ahead and try to reconnect to the device
 290                  */
 291                 if (address != null && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 292                         AltosDebug.debug("Reconnecting now...");
 293                         start_altos_bluetooth(address, false);
 294                 }
 295         }
 296
 297         /* A client has disconnected, clean up
 298          */
 299         private void remove_client(Messenger client) {
 300                 clients.remove(client);
 301                 AltosDebug.debug("Client unbound from service");
 302
 303                 /* When the list of clients is empty, stop the service if
 304                  * we have no current telemetry source
 305                  */
 306
 307                  if (clients.isEmpty() && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 308                          AltosDebug.debug("No clients, no connection. Stopping\n");
 309                          stopSelf();
 310                  }
 311         }
 312
 313         private void send_to_client(Messenger client) {
 314                 Message m = message();
 315                 try {
 316                         client.send(m);
 317                 } catch (RemoteException e) {
 318                         AltosDebug.error("Client %s disappeared", client.toString());
 319                         remove_client(client);
 320                 }
 321         }
 322
 323         private void send_to_clients() {
 324                 for (Messenger client : clients)
 325                         send_to_client(client);
 326         }
 327
 328         private void send_idle_mode_to_client(Messenger client) {
 329                 Message m = Message.obtain(null, AltosDroid.MSG_IDLE_MODE, idle_monitor != null);
 330                 try {
 331                         client.send(m);
 332                 } catch (RemoteException e) {
 333                         AltosDebug.error("Client %s disappeared", client.toString());
 334                         remove_client(client);
 335                 }
 336         }
 337
 338         private void send_idle_mode_to_clients() {
 339                 for (Messenger client : clients)
 340                         send_idle_mode_to_client(client);
 341         }
 342
 343         private void telemetry_start() {
 344                 if (telemetry_reader == null && idle_monitor == null && !ignite_running) {
 345                         telemetry_reader = new TelemetryReader(altos_link, handler);
 346                         telemetry_reader.start();
 347                 }
 348         }
 349
 350         private void telemetry_stop() {
 351                 if (telemetry_reader != null) {
 352                         AltosDebug.debug("disconnect(): stopping TelemetryReader");
 353                         telemetry_reader.interrupt();
 354                         try {
 355                                 telemetry_reader.join();
 356                         } catch (InterruptedException e) {
 357                         }
 358                         telemetry_reader = null;
 359                 }
 360         }
 361
 362         private void disconnect(boolean notify) {
 363                 AltosDebug.debug("disconnect(): begin");
 364
 365                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 366                 telemetry_state.address = null;
 367
 368                 if (idle_monitor != null)
 369                         stop_idle_monitor();
 370
 371                 if (altos_link != null)
 372                         altos_link.closing();
 373
 374                 stop_receiver_voltage_timer();
 375
 376                 telemetry_stop();
 377                 if (telemetry_logger != null) {
 378                         AltosDebug.debug("disconnect(): stopping TelemetryLogger");
 379                         telemetry_logger.stop();
 380                         telemetry_logger = null;
 381                 }
 382                 if (altos_link != null) {
 383                         AltosDebug.debug("disconnect(): stopping AltosDroidLink");
 384                         altos_link.close();
 385                         altos_link = null;
 386                         ignite = null;
 387                 }
 388                 telemetry_state.config = null;
 389                 if (notify) {
 390                         AltosDebug.debug("disconnect(): send message to clients");
 391                         send_to_clients();
 392                         if (clients.isEmpty()) {
 393                                 AltosDebug.debug("disconnect(): no clients, terminating");
 394                                 stopSelf();
 395                         }
 396                 }
 397         }
 398
 399         private void start_usb(UsbDevice device) {
 400                 AltosUsb        d = new AltosUsb(this, device, handler);
 401
 402                 if (d != null) {
 403                         disconnect(false);
 404                         altos_link = d;
 405                         try {
 406                                 connected();
 407                         } catch (InterruptedException ie) {
 408                         }
 409                 }
 410         }
 411
 412         private void delete_serial(int serial) {
 413                 telemetry_state.states.remove((Integer) serial);
 414                 AltosPreferences.remove_state(serial);
 415                 send_to_clients();
 416         }
 417
 418         private void start_altos_bluetooth(DeviceAddress address, boolean pause) {
 419                 if (bluetooth_adapter == null || !bluetooth_adapter.isEnabled())
 420                         return;
 421
 422                 disconnect(false);
 423
 424                 // Get the BluetoothDevice object
 425                 BluetoothDevice device = bluetooth_adapter.getRemoteDevice(address.address);
 426
 427                 this.address = address;
 428                 AltosDebug.debug("start_altos_bluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress());
 429                 altos_link = new AltosBluetooth(device, handler, pause);
 430                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTING;
 431                 telemetry_state.address = address;
 432                 send_to_clients();
 433         }
 434
 435         private void start_idle_monitor() {
 436                 if (altos_link != null && idle_monitor == null) {
 437                         telemetry_stop();
 438                         idle_monitor = new AltosIdleMonitor(this, altos_link, true, false);
 439                         idle_monitor.set_callsign(AltosPreferences.callsign());
 440                         idle_monitor.start();
 441                         send_idle_mode_to_clients();
 442                 }
 443         }
 444
 445         private void stop_idle_monitor() {
 446                 if (idle_monitor != null) {
 447                         try {
 448                                 idle_monitor.abort();
 449                         } catch (InterruptedException ie) {
 450                         }
 451                         idle_monitor = null;
 452                         telemetry_start();
 453                         send_idle_mode_to_clients();
 454                 }
 455         }
 456
 457         private void reboot_remote() {
 458                 if (altos_link != null) {
 459                         stop_idle_monitor();
 460                         try {
 461                                 altos_link.start_remote();
 462                                 altos_link.printf("r eboot\n");
 463                                 altos_link.flush_output();
 464                         } catch (TimeoutException te) {
 465                         } catch (InterruptedException ie) {
 466                         } finally {
 467                                 try {
 468                                         altos_link.stop_remote();
 469                                 } catch (InterruptedException ie) {
 470                                 }
 471                         }
 472                 }
 473         }
 474
 475         private void ensure_ignite() {
 476                 if (ignite == null)
 477                         ignite = new AltosIgnite(altos_link, true, false);
 478         }
 479
 480         private synchronized void igniter_query(Messenger client) {
 481                 ensure_ignite();
 482                 HashMap<String,Integer> status_map = null;
 483                 ignite_running = true;
 484                 try {
 485                         stop_idle_monitor();
 486                         try {
 487                                 status_map = ignite.status();
 488                         } catch (InterruptedException ie) {
 489                                 AltosDebug.debug("ignite.status interrupted");
 490                         } catch (TimeoutException te) {
 491                                 AltosDebug.debug("ignite.status timeout");
 492                         }
 493                 } finally {
 494                         ignite_running = false;
 495                 }
 496                 Message m = Message.obtain(null, AltosDroid.MSG_IGNITER_STATUS, status_map);
 497                 try {
 498                         client.send(m);
 499                 } catch (RemoteException e) {
 500                 }
 501         }
 502
 503         private synchronized void igniter_fire(String igniter) {
 504                 ensure_ignite();
 505                 ignite_running = true;
 506                 stop_idle_monitor();
 507                 try {
 508                         ignite.fire(igniter);
 509                 } catch (InterruptedException ie) {
 510                 } finally {
 511                         ignite_running = false;
 512                 }
 513         }
 514
 515         // Timer for receiver battery voltage monitoring
 516         Timer receiver_voltage_timer;
 517
 518         private void update_receiver_voltage() {
 519                 if (altos_link != null && idle_monitor == null && !ignite_running) {
 520                         try {
 521                                 double  voltage = altos_link.monitor_battery();
 522                                 telemetry_state.receiver_battery = voltage;
 523                                 send_to_clients();
 524                         } catch (InterruptedException ie) {
 525                         }
 526                 }
 527         }
 528
 529         private void stop_receiver_voltage_timer() {
 530                 if (receiver_voltage_timer != null) {
 531                         receiver_voltage_timer.cancel();
 532                         receiver_voltage_timer.purge();
 533                         receiver_voltage_timer = null;
 534                 }
 535         }
 536
 537         private void start_receiver_voltage_timer() {
 538                 if (receiver_voltage_timer == null && altos_link.has_monitor_battery()) {
 539                         receiver_voltage_timer = new Timer();
 540                         receiver_voltage_timer.scheduleAtFixedRate(new TimerTask() { public void run() {update_receiver_voltage();}}, 1000L, 10000L);
 541                 }
 542         }
 543
 544         private void connected() throws InterruptedException {
 545                 AltosDebug.debug("connected top");
 546                 AltosDebug.check_ui("connected\n");
 547                 try {
 548                         if (altos_link == null)
 549                                 throw new InterruptedException("no bluetooth");
 550                         telemetry_state.config = altos_link.config_data();
 551                         altos_link.set_radio_frequency(telemetry_state.frequency);
 552                         altos_link.set_telemetry_rate(telemetry_state.telemetry_rate);
 553                 } catch (TimeoutException e) {
 554                         // If this timed out, then we really want to retry it, but
 555                         // probably safer to just retry the connection from scratch.
 556                         AltosDebug.debug("connected timeout");
 557                         if (address != null) {
 558                                 AltosDebug.debug("connected timeout, retrying");
 559                                 start_altos_bluetooth(address, true);
 560                         } else {
 561                                 handler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 562                                 disconnect(true);
 563                         }
 564                         return;
 565                 }
 566
 567                 AltosDebug.debug("connected bluetooth configured");
 568                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTED;
 569                 telemetry_state.address = address;
 570
 571                 telemetry_start();
 572
 573                 AltosDebug.debug("connected TelemetryReader started");
 574
 575                 telemetry_logger = new TelemetryLogger(this, altos_link);
 576
 577                 start_receiver_voltage_timer();
 578
 579                 AltosDebug.debug("Notify UI of connection");
 580
 581                 send_to_clients();
 582         }
 583
 584
 585         @Override
 586         public void onCreate() {
 587
 588                 AltosDebug.init(this);
 589
 590                 // Initialise preferences
 591                 AltosDroidPreferences.init(this);
 592
 593                 // Get local Bluetooth adapter
 594                 bluetooth_adapter = BluetoothAdapter.getDefaultAdapter();
 595
 596                 telemetry_state = new TelemetryState();
 597
 598                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 599                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 600
 601                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 602                 telemetry_state.address = null;
 603
 604                 /* Pull the saved state information out of the preferences database
 605                  */
 606                 ArrayList<Integer> serials = AltosPreferences.list_states();
 607
 608                 telemetry_state.latest_serial = AltosPreferences.latest_state();
 609
 610                 telemetry_state.quiet = true;
 611
 612                 AltosDebug.debug("latest serial %d\n", telemetry_state.latest_serial);
 613
 614                 for (int serial : serials) {
 615                         AltosState saved_state = AltosPreferences.state(serial);
 616                         if (saved_state != null) {
 617                                 if (telemetry_state.latest_serial == 0)
 618                                         telemetry_state.latest_serial = serial;
 619
 620                                 AltosDebug.debug("recovered old state serial %d flight %d",
 621                                                  serial,
 622                                                  saved_state.cal_data().flight);
 623                                 if (saved_state.gps != null)
 624                                         AltosDebug.debug("\tposition %f,%f",
 625                                                          saved_state.gps.lat,
 626                                                          saved_state.gps.lon);
 627                                 telemetry_state.states.put(serial, saved_state);
 628                         } else {
 629                                 AltosDebug.debug("Failed to recover state for %d", serial);
 630                                 AltosPreferences.remove_state(serial);
 631                         }
 632                 }
 633         }
 634
 635
 636         private String createNotificationChannel(String channelId, String channelName) {
 637                 NotificationChannel chan = new NotificationChannel(
 638                                 channelId, channelName, NotificationManager.IMPORTANCE_NONE);
 639                 chan.setLightColor(Color.BLUE);
 640                 chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
 641                 NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 642                 service.createNotificationChannel(chan);
 643                 return channelId;
 644         }
 645
 646         @Override
 647         public int onStartCommand(Intent intent, int flags, int startId) {
 648                 AltosDebug.debug("Received start id %d: %s", startId, intent);
 649
 650                 // The PendingIntent to launch our activity if the user selects this notification
 651                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 652                                 new Intent(this, AltosDroid.class), 0);
 653
 654                 String channelId =
 655                                 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
 656                                                 ? createNotificationChannel("altosdroid_telemetry", "AltosDroid Telemetry Service")
 657                                                 : "";
 658
 659                 // Create notification to be displayed while the service runs
 660                 Notification notification = new Notification.Builder(this, channelId)
 661                                 .setContentTitle(getText(R.string.telemetry_service_label))
 662                                 .setContentText(getText(R.string.telemetry_service_started))
 663                                 .setContentIntent(contentIntent)
 664                                 .setWhen(System.currentTimeMillis())
 665                                 .setOngoing(true)
 666                                 .setSmallIcon(R.drawable.am_status_c)
 667 //                              .setLargeIcon(R.drawable.am_status_c)
 668                                 .build();
 669
 670                 // Move us into the foreground.
 671                 startForeground(NOTIFICATION, notification);
 672
 673                 /* Start bluetooth if we don't have a connection already */
 674                 if (intent != null &&
 675                     (telemetry_state.connect == TelemetryState.CONNECT_NONE ||
 676                      telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED))
 677                 {
 678                         String  action = intent.getAction();
 679
 680                         if (action.equals(AltosDroid.ACTION_BLUETOOTH)) {
 681                                 DeviceAddress address = AltosDroidPreferences.active_device();
 682                                 if (address != null && !address.address.startsWith("USB"))
 683                                         start_altos_bluetooth(address, false);
 684                         }
 685                 }
 686
 687                 // We want this service to continue running until it is explicitly
 688                 // stopped, so return sticky.
 689                 return START_STICKY;
 690         }
 691
 692         @Override
 693         public void onDestroy() {
 694
 695                 // Stop the bluetooth Comms threads
 696                 disconnect(true);
 697
 698                 // Demote us from the foreground, and cancel the persistent notification.
 699                 stopForeground(true);
 700
 701                 // Tell the user we stopped.
 702                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 703         }
 704
 705         @Override
 706         public IBinder onBind(Intent intent) {
 707                 return messenger.getBinder();
 708         }
 709
 710         /* AltosIdleMonitorListener */
 711         public void update(AltosState state, AltosListenerState listener_state) {
 712                 telemetry_state.states.put(state.cal_data().serial, state);
 713                 telemetry_state.receiver_battery = listener_state.battery;
 714                 send_to_clients();
 715         }
 716
 717         public void failed() {
 718         }
 719
 720         public void error(String reason) {
 721                 stop_idle_monitor();
 722         }
 723 }