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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 import androidx.core.app.NotificationCompat;
  35
  36 import org.altusmetrum.altoslib_13.*;
  37
  38 public class TelemetryService extends Service implements AltosIdleMonitorListener {
  39
  40         static final int MSG_REGISTER_CLIENT   = 1;
  41         static final int MSG_UNREGISTER_CLIENT = 2;
  42         static final int MSG_CONNECT           = 3;
  43         static final int MSG_OPEN_USB          = 4;
  44         static final int MSG_CONNECTED         = 5;
  45         static final int MSG_CONNECT_FAILED    = 6;
  46         static final int MSG_DISCONNECTED      = 7;
  47         static final int MSG_TELEMETRY         = 8;
  48         static final int MSG_SETFREQUENCY      = 9;
  49         static final int MSG_CRC_ERROR         = 10;
  50         static final int MSG_SETBAUD           = 11;
  51         static final int MSG_DISCONNECT        = 12;
  52         static final int MSG_DELETE_SERIAL     = 13;
  53         static final int MSG_BLUETOOTH_ENABLED = 14;
  54         static final int MSG_MONITOR_IDLE_START= 15;
  55         static final int MSG_MONITOR_IDLE_STOP = 16;
  56         static final int MSG_REBOOT            = 17;
  57         static final int MSG_IGNITER_QUERY     = 18;
  58         static final int MSG_IGNITER_FIRE      = 19;
  59
  60         // Unique Identification Number for the Notification.
  61         // We use it on Notification start, and to cancel it.
  62         private int NOTIFICATION = R.string.telemetry_service_label;
  63         //private NotificationManager mNM;
  64
  65         ArrayList<Messenger> clients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  66         final Handler   handler   = new IncomingHandler(this);
  67         final Messenger messenger = new Messenger(handler); // Target we publish for clients to send messages to IncomingHandler.
  68
  69         // Name of the connected device
  70         DeviceAddress address;
  71         private AltosDroidLink  altos_link  = null;
  72         private TelemetryReader telemetry_reader = null;
  73         private TelemetryLogger telemetry_logger = null;
  74
  75         // Local Bluetooth adapter
  76         private BluetoothAdapter bluetooth_adapter = null;
  77
  78         // Last data seen; send to UI when it starts
  79         private TelemetryState  telemetry_state;
  80
  81         // Idle monitor if active
  82         AltosIdleMonitor idle_monitor = null;
  83
  84         // Igniter bits
  85         AltosIgnite ignite = null;
  86         boolean ignite_running;
  87
  88         // Handler of incoming messages from clients.
  89         static class IncomingHandler extends Handler {
  90                 private final WeakReference<TelemetryService> service;
  91                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  92
  93                 @Override
  94                 public void handleMessage(Message msg) {
  95                         DeviceAddress address;
  96
  97                         TelemetryService s = service.get();
  98                         AltosDroidLink bt = null;
  99                         if (s == null)
 100                                 return;
 101
 102                         switch (msg.what) {
 103
 104                                 /* Messages from application */
 105                         case MSG_REGISTER_CLIENT:
 106                                 s.add_client(msg.replyTo);
 107                                 break;
 108                         case MSG_UNREGISTER_CLIENT:
 109                                 s.remove_client(msg.replyTo);
 110                                 break;
 111                         case MSG_CONNECT:
 112                                 AltosDebug.debug("Connect command received");
 113                                 address = (DeviceAddress) msg.obj;
 114                                 AltosDroidPreferences.set_active_device(address);
 115                                 s.start_altos_bluetooth(address, false);
 116                                 break;
 117                         case MSG_OPEN_USB:
 118                                 AltosDebug.debug("Open USB command received");
 119                                 UsbDevice device = (UsbDevice) msg.obj;
 120                                 s.start_usb(device);
 121                                 break;
 122                         case MSG_DISCONNECT:
 123                                 AltosDebug.debug("Disconnect command received");
 124                                 s.address = null;
 125                                 if (!(Boolean) msg.obj)
 126                                         AltosDroidPreferences.set_active_device(null);
 127                                 s.disconnect(true);
 128                                 break;
 129                         case MSG_DELETE_SERIAL:
 130                                 AltosDebug.debug("Delete Serial command received");
 131                                 s.delete_serial((Integer) msg.obj);
 132                                 break;
 133                         case MSG_SETFREQUENCY:
 134                                 AltosDebug.debug("MSG_SETFREQUENCY");
 135                                 s.telemetry_state.frequency = (Double) msg.obj;
 136                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 137                                         try {
 138                                                 s.altos_link.set_radio_frequency(s.telemetry_state.frequency);
 139                                                 s.altos_link.save_frequency();
 140                                         } catch (InterruptedException e) {
 141                                         } catch (TimeoutException e) {
 142                                         }
 143                                 }
 144                                 s.send_to_clients();
 145                                 break;
 146                         case MSG_SETBAUD:
 147                                 AltosDebug.debug("MSG_SETBAUD");
 148                                 s.telemetry_state.telemetry_rate = (Integer) msg.obj;
 149                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 150                                         s.altos_link.set_telemetry_rate(s.telemetry_state.telemetry_rate);
 151                                         s.altos_link.save_telemetry_rate();
 152                                 }
 153                                 s.send_to_clients();
 154                                 break;
 155
 156                                 /*
 157                                  *Messages from AltosBluetooth
 158                                  */
 159                         case MSG_CONNECTED:
 160                                 AltosDebug.debug("MSG_CONNECTED");
 161                                 bt = (AltosDroidLink) msg.obj;
 162
 163                                 if (bt != s.altos_link) {
 164                                         AltosDebug.debug("Stale message");
 165                                         break;
 166                                 }
 167                                 AltosDebug.debug("Connected to device");
 168                                 try {
 169                                         s.connected();
 170                                 } catch (InterruptedException ie) {
 171                                 }
 172                                 break;
 173                         case MSG_CONNECT_FAILED:
 174                                 AltosDebug.debug("MSG_CONNECT_FAILED");
 175                                 bt = (AltosDroidLink) msg.obj;
 176
 177                                 if (bt != s.altos_link) {
 178                                         AltosDebug.debug("Stale message");
 179                                         break;
 180                                 }
 181                                 if (s.address != null) {
 182                                         AltosDebug.debug("Connection failed... retrying");
 183                                         s.start_altos_bluetooth(s.address, true);
 184                                 } else {
 185                                         s.disconnect(true);
 186                                 }
 187                                 break;
 188                         case MSG_DISCONNECTED:
 189
 190                                 /* This can be sent by either AltosDroidLink or TelemetryReader */
 191                                 AltosDebug.debug("MSG_DISCONNECTED");
 192                                 bt = (AltosDroidLink) msg.obj;
 193
 194                                 if (bt != s.altos_link) {
 195                                         AltosDebug.debug("Stale message");
 196                                         break;
 197                                 }
 198                                 if (s.address != null) {
 199                                         AltosDebug.debug("Connection lost... retrying");
 200                                         s.start_altos_bluetooth(s.address, true);
 201                                 } else {
 202                                         s.disconnect(true);
 203                                 }
 204                                 break;
 205
 206                                 /*
 207                                  * Messages from TelemetryReader
 208                                  */
 209                         case MSG_TELEMETRY:
 210                                 s.telemetry((AltosTelemetry) msg.obj);
 211                                 break;
 212                         case MSG_CRC_ERROR:
 213                                 // forward crc error messages
 214                                 s.telemetry_state.crc_errors = (Integer) msg.obj;
 215                                 s.send_to_clients();
 216                                 break;
 217                         case MSG_BLUETOOTH_ENABLED:
 218                                 AltosDebug.debug("TelemetryService notes that BT is now enabled");
 219                                 address = AltosDroidPreferences.active_device();
 220                                 if (address != null && !address.address.startsWith("USB"))
 221                                         s.start_altos_bluetooth(address, false);
 222                                 break;
 223                         case MSG_MONITOR_IDLE_START:
 224                                 AltosDebug.debug("start monitor idle");
 225                                 s.start_idle_monitor();
 226                                 break;
 227                         case MSG_MONITOR_IDLE_STOP:
 228                                 AltosDebug.debug("stop monitor idle");
 229                                 s.stop_idle_monitor();
 230                                 break;
 231                         case MSG_REBOOT:
 232                                 AltosDebug.debug("reboot");
 233                                 s.reboot_remote();
 234                                 break;
 235                         case MSG_IGNITER_QUERY:
 236                                 AltosDebug.debug("igniter query");
 237                                 s.igniter_query(msg.replyTo);
 238                                 break;
 239                         case MSG_IGNITER_FIRE:
 240                                 AltosDebug.debug("igniter fire");
 241                                 s.igniter_fire((String) msg.obj);
 242                                 break;
 243                         default:
 244                                 super.handleMessage(msg);
 245                         }
 246                 }
 247         }
 248
 249         /* Handle telemetry packet
 250          */
 251         private void telemetry(AltosTelemetry telem) {
 252                 AltosState      state;
 253
 254                 state = telemetry_state.get(telem.serial());
 255                 if (state == null)
 256                         state = new AltosState(new AltosCalData());
 257                 telem.provide_data(state);
 258                 telemetry_state.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                 return Message.obtain(null, AltosDroid.MSG_STATE, telemetry_state);
 272         }
 273
 274         /* A new friend has connected
 275          */
 276         private void add_client(Messenger client) {
 277
 278                 clients.add(client);
 279                 AltosDebug.debug("Client bound to service");
 280
 281                 /* On connect, send the current state to the new client
 282                  */
 283                 send_to_client(client);
 284                 send_idle_mode_to_client(client);
 285
 286                 /* If we've got an address from a previous session, then
 287                  * go ahead and try to reconnect to the device
 288                  */
 289                 if (address != null && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 290                         AltosDebug.debug("Reconnecting now...");
 291                         start_altos_bluetooth(address, false);
 292                 }
 293         }
 294
 295         /* A client has disconnected, clean up
 296          */
 297         private void remove_client(Messenger client) {
 298                 clients.remove(client);
 299                 AltosDebug.debug("Client unbound from service");
 300
 301                 /* When the list of clients is empty, stop the service if
 302                  * we have no current telemetry source
 303                  */
 304
 305                  if (clients.isEmpty() && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 306                          AltosDebug.debug("No clients, no connection. Stopping\n");
 307                          stopSelf();
 308                  }
 309         }
 310
 311         private void send_to_client(Messenger client) {
 312                 Message m = message();
 313                 try {
 314                         client.send(m);
 315                 } catch (RemoteException e) {
 316                         AltosDebug.error("Client %s disappeared", client.toString());
 317                         remove_client(client);
 318                 }
 319         }
 320
 321         private void send_to_clients() {
 322                 for (Messenger client : clients)
 323                         send_to_client(client);
 324         }
 325
 326         private void send_idle_mode_to_client(Messenger client) {
 327                 Message m = Message.obtain(null, AltosDroid.MSG_IDLE_MODE, idle_monitor != null);
 328                 try {
 329                         client.send(m);
 330                 } catch (RemoteException e) {
 331                         AltosDebug.error("Client %s disappeared", client.toString());
 332                         remove_client(client);
 333                 }
 334         }
 335
 336         private void send_idle_mode_to_clients() {
 337                 for (Messenger client : clients)
 338                         send_idle_mode_to_client(client);
 339         }
 340
 341         private void telemetry_start() {
 342                 if (telemetry_reader == null && idle_monitor == null && !ignite_running) {
 343                         telemetry_reader = new TelemetryReader(altos_link, handler);
 344                         telemetry_reader.start();
 345                 }
 346         }
 347
 348         private void telemetry_stop() {
 349                 if (telemetry_reader != null) {
 350                         AltosDebug.debug("disconnect(): stopping TelemetryReader");
 351                         telemetry_reader.interrupt();
 352                         try {
 353                                 telemetry_reader.join();
 354                         } catch (InterruptedException e) {
 355                         }
 356                         telemetry_reader = null;
 357                 }
 358         }
 359
 360         private void disconnect(boolean notify) {
 361                 AltosDebug.debug("disconnect(): begin");
 362
 363                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 364                 telemetry_state.address = null;
 365
 366                 if (idle_monitor != null)
 367                         stop_idle_monitor();
 368
 369                 if (altos_link != null)
 370                         altos_link.closing();
 371
 372                 stop_receiver_voltage_timer();
 373
 374                 telemetry_stop();
 375                 if (telemetry_logger != null) {
 376                         AltosDebug.debug("disconnect(): stopping TelemetryLogger");
 377                         telemetry_logger.stop();
 378                         telemetry_logger = null;
 379                 }
 380                 if (altos_link != null) {
 381                         AltosDebug.debug("disconnect(): stopping AltosDroidLink");
 382                         altos_link.close();
 383                         altos_link = null;
 384                         ignite = null;
 385                 }
 386                 telemetry_state.config = null;
 387                 if (notify) {
 388                         AltosDebug.debug("disconnect(): send message to clients");
 389                         send_to_clients();
 390                         if (clients.isEmpty()) {
 391                                 AltosDebug.debug("disconnect(): no clients, terminating");
 392                                 stopSelf();
 393                         }
 394                 }
 395         }
 396
 397         private void start_usb(UsbDevice device) {
 398                 AltosUsb        d = new AltosUsb(this, device, handler);
 399
 400                 if (d != null) {
 401                         disconnect(false);
 402                         altos_link = d;
 403                         try {
 404                                 connected();
 405                         } catch (InterruptedException ie) {
 406                         }
 407                 }
 408         }
 409
 410         private void delete_serial(int serial) {
 411                 telemetry_state.remove(serial);
 412                 AltosPreferences.remove_state(serial);
 413                 send_to_clients();
 414         }
 415
 416         private void start_altos_bluetooth(DeviceAddress address, boolean pause) {
 417                 if (bluetooth_adapter == null || !bluetooth_adapter.isEnabled())
 418                         return;
 419
 420                 disconnect(false);
 421
 422                 // Get the BluetoothDevice object
 423                 BluetoothDevice device = bluetooth_adapter.getRemoteDevice(address.address);
 424
 425                 this.address = address;
 426                 AltosDebug.debug("start_altos_bluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress());
 427                 altos_link = new AltosBluetooth(device, handler, pause);
 428                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTING;
 429                 telemetry_state.address = address;
 430                 send_to_clients();
 431         }
 432
 433         private void start_idle_monitor() {
 434                 if (altos_link != null && idle_monitor == null) {
 435                         telemetry_stop();
 436                         idle_monitor = new AltosIdleMonitor(this, altos_link, true, false);
 437                         idle_monitor.set_callsign(AltosPreferences.callsign());
 438                         idle_monitor.set_frequency(telemetry_state.frequency);
 439                         telemetry_state.idle_mode = true;
 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_state.idle_mode = false;
 453                         telemetry_start();
 454                         send_idle_mode_to_clients();
 455                 }
 456         }
 457
 458         private void reboot_remote() {
 459                 if (altos_link != null) {
 460                         stop_idle_monitor();
 461                         try {
 462                                 altos_link.start_remote();
 463                                 altos_link.printf("r eboot\n");
 464                                 altos_link.flush_output();
 465                         } catch (TimeoutException te) {
 466                         } catch (InterruptedException ie) {
 467                         } finally {
 468                                 try {
 469                                         altos_link.stop_remote();
 470                                 } catch (InterruptedException ie) {
 471                                 }
 472                         }
 473                 }
 474         }
 475
 476         private void ensure_ignite() {
 477                 if (ignite == null)
 478                         ignite = new AltosIgnite(altos_link, true, false);
 479         }
 480
 481         private synchronized void igniter_query(Messenger client) {
 482                 ensure_ignite();
 483                 HashMap<String,Integer> status_map = null;
 484                 ignite_running = true;
 485                 try {
 486                         stop_idle_monitor();
 487                         try {
 488                                 status_map = ignite.status();
 489                         } catch (InterruptedException ie) {
 490                                 AltosDebug.debug("ignite.status interrupted");
 491                         } catch (TimeoutException te) {
 492                                 AltosDebug.debug("ignite.status timeout");
 493                         }
 494                 } finally {
 495                         ignite_running = false;
 496                 }
 497                 Message m = Message.obtain(null, AltosDroid.MSG_IGNITER_STATUS, status_map);
 498                 try {
 499                         client.send(m);
 500                 } catch (RemoteException e) {
 501                 }
 502         }
 503
 504         private synchronized void igniter_fire(String igniter) {
 505                 ensure_ignite();
 506                 ignite_running = true;
 507                 stop_idle_monitor();
 508                 try {
 509                         ignite.fire(igniter);
 510                 } catch (InterruptedException ie) {
 511                 } finally {
 512                         ignite_running = false;
 513                 }
 514         }
 515
 516         // Timer for receiver battery voltage monitoring
 517         Timer receiver_voltage_timer;
 518
 519         private void update_receiver_voltage() {
 520                 if (altos_link != null && idle_monitor == null && !ignite_running) {
 521                         try {
 522                                 double  voltage = altos_link.monitor_battery();
 523                                 telemetry_state.receiver_battery = voltage;
 524                                 send_to_clients();
 525                         } catch (InterruptedException ie) {
 526                         }
 527                 }
 528         }
 529
 530         private void stop_receiver_voltage_timer() {
 531                 if (receiver_voltage_timer != null) {
 532                         receiver_voltage_timer.cancel();
 533                         receiver_voltage_timer.purge();
 534                         receiver_voltage_timer = null;
 535                 }
 536         }
 537
 538         private void start_receiver_voltage_timer() {
 539                 if (receiver_voltage_timer == null && altos_link.has_monitor_battery()) {
 540                         receiver_voltage_timer = new Timer();
 541                         receiver_voltage_timer.scheduleAtFixedRate(new TimerTask() { public void run() {update_receiver_voltage();}}, 1000L, 10000L);
 542                 }
 543         }
 544
 545         private void connected() throws InterruptedException {
 546                 AltosDebug.debug("connected top");
 547                 AltosDebug.check_ui("connected\n");
 548                 try {
 549                         if (altos_link == null)
 550                                 throw new InterruptedException("no bluetooth");
 551                         telemetry_state.config = altos_link.config_data();
 552                         altos_link.set_radio_frequency(telemetry_state.frequency);
 553                         altos_link.set_telemetry_rate(telemetry_state.telemetry_rate);
 554                 } catch (TimeoutException e) {
 555                         // If this timed out, then we really want to retry it, but
 556                         // probably safer to just retry the connection from scratch.
 557                         AltosDebug.debug("connected timeout");
 558                         if (address != null) {
 559                                 AltosDebug.debug("connected timeout, retrying");
 560                                 start_altos_bluetooth(address, true);
 561                         } else {
 562                                 handler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 563                                 disconnect(true);
 564                         }
 565                         return;
 566                 }
 567
 568                 AltosDebug.debug("connected bluetooth configured");
 569                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTED;
 570                 telemetry_state.address = address;
 571
 572                 telemetry_start();
 573
 574                 AltosDebug.debug("connected TelemetryReader started");
 575
 576                 telemetry_logger = new TelemetryLogger(this, altos_link);
 577
 578                 start_receiver_voltage_timer();
 579
 580                 AltosDebug.debug("Notify UI of connection");
 581
 582                 send_to_clients();
 583         }
 584
 585
 586         @Override
 587         public void onCreate() {
 588
 589                 AltosDebug.init(this);
 590
 591                 // Initialise preferences
 592                 AltosDroidPreferences.init(this);
 593
 594                 // Get local Bluetooth adapter
 595                 bluetooth_adapter = BluetoothAdapter.getDefaultAdapter();
 596
 597                 telemetry_state = new TelemetryState();
 598
 599                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 600                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 601
 602                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 603                 telemetry_state.address = null;
 604
 605                 /* Pull the saved state information out of the preferences database
 606                  */
 607                 ArrayList<Integer> serials = AltosPreferences.list_states();
 608
 609                 telemetry_state.latest_serial = AltosPreferences.latest_state();
 610
 611                 telemetry_state.quiet = true;
 612
 613                 AltosDebug.debug("latest serial %d\n", telemetry_state.latest_serial);
 614
 615                 for (int serial : serials) {
 616                         AltosState saved_state = AltosPreferences.state(serial);
 617                         if (saved_state != null) {
 618                                 AltosDebug.debug("recovered old state serial %d flight %d",
 619                                                  serial,
 620                                                  saved_state.cal_data().flight);
 621                                 if (saved_state.gps != null)
 622                                         AltosDebug.debug("\tposition %f,%f",
 623                                                          saved_state.gps.lat,
 624                                                          saved_state.gps.lon);
 625                                 telemetry_state.put(serial, saved_state);
 626                         } else {
 627                                 AltosDebug.debug("Failed to recover state for %d", serial);
 628                                 AltosPreferences.remove_state(serial);
 629                         }
 630                 }
 631         }
 632
 633
 634         private String createNotificationChannel(String channelId, String channelName) {
 635                 NotificationChannel chan = new NotificationChannel(
 636                                 channelId, channelName, NotificationManager.IMPORTANCE_NONE);
 637                 chan.setLightColor(Color.BLUE);
 638                 chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
 639                 NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 640                 service.createNotificationChannel(chan);
 641                 return channelId;
 642         }
 643
 644         @Override
 645         public int onStartCommand(Intent intent, int flags, int startId) {
 646                 AltosDebug.debug("Received start id %d: %s", startId, intent);
 647
 648                 // The PendingIntent to launch our activity if the user selects this notification
 649                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 650                                 new Intent(this, AltosDroid.class), 0);
 651
 652                 String channelId =
 653                                 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
 654                                                 ? createNotificationChannel("altosdroid_telemetry", "AltosDroid Telemetry Service")
 655                                                 : "";
 656
 657                 // Create notification to be displayed while the service runs
 658                 Notification notification = new NotificationCompat.Builder(this, channelId)
 659                                 .setContentTitle(getText(R.string.telemetry_service_label))
 660                                 .setContentText(getText(R.string.telemetry_service_started))
 661                                 .setContentIntent(contentIntent)
 662                                 .setWhen(System.currentTimeMillis())
 663                                 .setOngoing(true)
 664                                 .setSmallIcon(R.drawable.am_status_c)
 665 //                              .setLargeIcon(R.drawable.am_status_c)
 666                                 .build();
 667
 668                 // Move us into the foreground.
 669                 startForeground(NOTIFICATION, notification);
 670
 671                 /* Start bluetooth if we don't have a connection already */
 672                 if (intent != null &&
 673                     (telemetry_state.connect == TelemetryState.CONNECT_NONE ||
 674                      telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED))
 675                 {
 676                         String  action = intent.getAction();
 677
 678                         if (action.equals(AltosDroid.ACTION_BLUETOOTH)) {
 679                                 DeviceAddress address = AltosDroidPreferences.active_device();
 680                                 if (address != null && !address.address.startsWith("USB"))
 681                                         start_altos_bluetooth(address, false);
 682                         }
 683                 }
 684
 685                 // We want this service to continue running until it is explicitly
 686                 // stopped, so return sticky.
 687                 return START_STICKY;
 688         }
 689
 690         @Override
 691         public void onDestroy() {
 692
 693                 // Stop the bluetooth Comms threads
 694                 disconnect(true);
 695
 696                 // Demote us from the foreground, and cancel the persistent notification.
 697                 stopForeground(true);
 698
 699                 // Tell the user we stopped.
 700                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 701         }
 702
 703         @Override
 704         public IBinder onBind(Intent intent) {
 705                 return messenger.getBinder();
 706         }
 707
 708         /* AltosIdleMonitorListener */
 709         public void update(AltosState state, AltosListenerState listener_state) {
 710                 if (state != null)
 711                         AltosDebug.debug("update call %s freq %7.3f", state.cal_data().callsign, state.frequency);
 712                 telemetry_state.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 }