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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.idle_monitor != null) {
 137                                         s.idle_monitor.set_frequency(s.telemetry_state.frequency);
 138                                 } else if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 139                                         try {
 140                                                 s.altos_link.set_radio_frequency(s.telemetry_state.frequency);
 141                                                 s.altos_link.save_frequency();
 142                                         } catch (InterruptedException e) {
 143                                         } catch (TimeoutException e) {
 144                                         }
 145                                 }
 146                                 s.send_to_clients();
 147                                 break;
 148                         case MSG_SETBAUD:
 149                                 AltosDebug.debug("MSG_SETBAUD");
 150                                 s.telemetry_state.telemetry_rate = (Integer) msg.obj;
 151                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 152                                         s.altos_link.set_telemetry_rate(s.telemetry_state.telemetry_rate);
 153                                         s.altos_link.save_telemetry_rate();
 154                                 }
 155                                 s.send_to_clients();
 156                                 break;
 157
 158                                 /*
 159                                  *Messages from AltosBluetooth
 160                                  */
 161                         case MSG_CONNECTED:
 162                                 AltosDebug.debug("MSG_CONNECTED");
 163                                 bt = (AltosDroidLink) msg.obj;
 164
 165                                 if (bt != s.altos_link) {
 166                                         AltosDebug.debug("Stale message");
 167                                         break;
 168                                 }
 169                                 AltosDebug.debug("Connected to device");
 170                                 try {
 171                                         s.connected();
 172                                 } catch (InterruptedException ie) {
 173                                 }
 174                                 break;
 175                         case MSG_CONNECT_FAILED:
 176                                 AltosDebug.debug("MSG_CONNECT_FAILED");
 177                                 bt = (AltosDroidLink) msg.obj;
 178
 179                                 if (bt != s.altos_link) {
 180                                         AltosDebug.debug("Stale message");
 181                                         break;
 182                                 }
 183                                 if (s.address != null) {
 184                                         AltosDebug.debug("Connection failed... retrying");
 185                                         s.start_altos_bluetooth(s.address, true);
 186                                 } else {
 187                                         s.disconnect(true);
 188                                 }
 189                                 break;
 190                         case MSG_DISCONNECTED:
 191
 192                                 /* This can be sent by either AltosDroidLink or TelemetryReader */
 193                                 AltosDebug.debug("MSG_DISCONNECTED");
 194                                 bt = (AltosDroidLink) msg.obj;
 195
 196                                 if (bt != s.altos_link) {
 197                                         AltosDebug.debug("Stale message");
 198                                         break;
 199                                 }
 200                                 if (s.address != null) {
 201                                         AltosDebug.debug("Connection lost... retrying");
 202                                         s.start_altos_bluetooth(s.address, true);
 203                                 } else {
 204                                         s.disconnect(true);
 205                                 }
 206                                 break;
 207
 208                                 /*
 209                                  * Messages from TelemetryReader
 210                                  */
 211                         case MSG_TELEMETRY:
 212                                 s.telemetry((AltosTelemetry) msg.obj);
 213                                 break;
 214                         case MSG_CRC_ERROR:
 215                                 // forward crc error messages
 216                                 s.telemetry_state.crc_errors = (Integer) msg.obj;
 217                                 s.send_to_clients();
 218                                 break;
 219                         case MSG_BLUETOOTH_ENABLED:
 220                                 AltosDebug.debug("TelemetryService notes that BT is now enabled");
 221                                 address = AltosDroidPreferences.active_device();
 222                                 if (address != null && !address.address.startsWith("USB"))
 223                                         s.start_altos_bluetooth(address, false);
 224                                 break;
 225                         case MSG_MONITOR_IDLE_START:
 226                                 AltosDebug.debug("start monitor idle");
 227                                 s.start_idle_monitor();
 228                                 break;
 229                         case MSG_MONITOR_IDLE_STOP:
 230                                 AltosDebug.debug("stop monitor idle");
 231                                 s.stop_idle_monitor();
 232                                 break;
 233                         case MSG_REBOOT:
 234                                 AltosDebug.debug("reboot");
 235                                 s.reboot_remote();
 236                                 break;
 237                         case MSG_IGNITER_QUERY:
 238                                 AltosDebug.debug("igniter query");
 239                                 s.igniter_query(msg.replyTo);
 240                                 break;
 241                         case MSG_IGNITER_FIRE:
 242                                 AltosDebug.debug("igniter fire");
 243                                 s.igniter_fire((String) msg.obj);
 244                                 break;
 245                         default:
 246                                 super.handleMessage(msg);
 247                         }
 248                 }
 249         }
 250
 251         /* Handle telemetry packet
 252          */
 253         private void telemetry(AltosTelemetry telem) {
 254                 AltosState      state;
 255
 256                 state = telemetry_state.get(telem.serial());
 257                 if (state == null)
 258                         state = new AltosState(new AltosCalData());
 259                 telem.provide_data(state);
 260                 telemetry_state.put(telem.serial(), state);
 261                 telemetry_state.quiet = false;
 262                 if (state != null) {
 263                         AltosPreferences.set_state(state,telem.serial());
 264                 }
 265                 send_to_clients();
 266         }
 267
 268         /* Construct the message to deliver to clients
 269          */
 270         private Message message() {
 271                 if (telemetry_state == null)
 272                         AltosDebug.debug("telemetry_state 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.remove(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.set_frequency(telemetry_state.frequency);
 441                         telemetry_state.idle_mode = true;
 442                         idle_monitor.start();
 443                         send_idle_mode_to_clients();
 444                 }
 445         }
 446
 447         private void stop_idle_monitor() {
 448                 if (idle_monitor != null) {
 449                         try {
 450                                 idle_monitor.abort();
 451                         } catch (InterruptedException ie) {
 452                         }
 453                         idle_monitor = null;
 454                         telemetry_state.idle_mode = false;
 455                         telemetry_start();
 456                         send_idle_mode_to_clients();
 457                 }
 458         }
 459
 460         private void reboot_remote() {
 461                 if (altos_link != null) {
 462                         stop_idle_monitor();
 463                         try {
 464                                 altos_link.start_remote();
 465                                 altos_link.printf("r eboot\n");
 466                                 altos_link.flush_output();
 467                         } catch (TimeoutException te) {
 468                         } catch (InterruptedException ie) {
 469                         } finally {
 470                                 try {
 471                                         altos_link.stop_remote();
 472                                 } catch (InterruptedException ie) {
 473                                 }
 474                         }
 475                 }
 476         }
 477
 478         private void ensure_ignite() {
 479                 if (ignite == null)
 480                         ignite = new AltosIgnite(altos_link, true, false);
 481         }
 482
 483         private synchronized void igniter_query(Messenger client) {
 484                 ensure_ignite();
 485                 HashMap<String,Integer> status_map = null;
 486                 ignite_running = true;
 487                 try {
 488                         stop_idle_monitor();
 489                         try {
 490                                 status_map = ignite.status();
 491                         } catch (InterruptedException ie) {
 492                                 AltosDebug.debug("ignite.status interrupted");
 493                         } catch (TimeoutException te) {
 494                                 AltosDebug.debug("ignite.status timeout");
 495                         }
 496                 } finally {
 497                         ignite_running = false;
 498                 }
 499                 Message m = Message.obtain(null, AltosDroid.MSG_IGNITER_STATUS, status_map);
 500                 try {
 501                         client.send(m);
 502                 } catch (RemoteException e) {
 503                 }
 504         }
 505
 506         private synchronized void igniter_fire(String igniter) {
 507                 ensure_ignite();
 508                 ignite_running = true;
 509                 stop_idle_monitor();
 510                 try {
 511                         ignite.fire(igniter);
 512                 } catch (InterruptedException ie) {
 513                 } finally {
 514                         ignite_running = false;
 515                 }
 516         }
 517
 518         // Timer for receiver battery voltage monitoring
 519         Timer receiver_voltage_timer;
 520
 521         private void update_receiver_voltage() {
 522                 if (altos_link != null && idle_monitor == null && !ignite_running) {
 523                         try {
 524                                 double  voltage = altos_link.monitor_battery();
 525                                 telemetry_state.receiver_battery = voltage;
 526                                 send_to_clients();
 527                         } catch (InterruptedException ie) {
 528                         }
 529                 }
 530         }
 531
 532         private void stop_receiver_voltage_timer() {
 533                 if (receiver_voltage_timer != null) {
 534                         receiver_voltage_timer.cancel();
 535                         receiver_voltage_timer.purge();
 536                         receiver_voltage_timer = null;
 537                 }
 538         }
 539
 540         private void start_receiver_voltage_timer() {
 541                 if (receiver_voltage_timer == null && altos_link.has_monitor_battery()) {
 542                         receiver_voltage_timer = new Timer();
 543                         receiver_voltage_timer.scheduleAtFixedRate(new TimerTask() { public void run() {update_receiver_voltage();}}, 1000L, 10000L);
 544                 }
 545         }
 546
 547         private void connected() throws InterruptedException {
 548                 AltosDebug.debug("connected top");
 549                 AltosDebug.check_ui("connected\n");
 550                 try {
 551                         if (altos_link == null)
 552                                 throw new InterruptedException("no bluetooth");
 553                         telemetry_state.config = altos_link.config_data();
 554                         altos_link.set_radio_frequency(telemetry_state.frequency);
 555                         altos_link.set_telemetry_rate(telemetry_state.telemetry_rate);
 556                 } catch (TimeoutException e) {
 557                         // If this timed out, then we really want to retry it, but
 558                         // probably safer to just retry the connection from scratch.
 559                         AltosDebug.debug("connected timeout");
 560                         if (address != null) {
 561                                 AltosDebug.debug("connected timeout, retrying");
 562                                 start_altos_bluetooth(address, true);
 563                         } else {
 564                                 handler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 565                                 disconnect(true);
 566                         }
 567                         return;
 568                 }
 569
 570                 AltosDebug.debug("connected bluetooth configured");
 571                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTED;
 572                 telemetry_state.address = address;
 573
 574                 telemetry_start();
 575
 576                 AltosDebug.debug("connected TelemetryReader started");
 577
 578                 telemetry_logger = new TelemetryLogger(this, altos_link);
 579
 580                 start_receiver_voltage_timer();
 581
 582                 AltosDebug.debug("Notify UI of connection");
 583
 584                 send_to_clients();
 585         }
 586
 587
 588         @Override
 589         public void onCreate() {
 590
 591                 AltosDebug.init(this);
 592
 593                 // Initialise preferences
 594                 AltosDroidPreferences.init(this);
 595
 596                 // Get local Bluetooth adapter
 597                 bluetooth_adapter = BluetoothAdapter.getDefaultAdapter();
 598
 599                 telemetry_state = new TelemetryState();
 600
 601                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 602                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 603
 604                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 605                 telemetry_state.address = null;
 606
 607                 /* Pull the saved state information out of the preferences database
 608                  */
 609                 ArrayList<Integer> serials = AltosPreferences.list_states();
 610
 611                 telemetry_state.latest_serial = AltosPreferences.latest_state();
 612
 613                 telemetry_state.quiet = true;
 614
 615                 AltosDebug.debug("latest serial %d\n", telemetry_state.latest_serial);
 616
 617                 for (int serial : serials) {
 618                         AltosState saved_state = AltosPreferences.state(serial);
 619                         if (saved_state != null) {
 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.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 NotificationCompat.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                 if (state != null)
 713                         AltosDebug.debug("update call %s freq %7.3f", state.cal_data().callsign, state.frequency);
 714                 telemetry_state.put(state.cal_data().serial, state);
 715                 telemetry_state.receiver_battery = listener_state.battery;
 716                 send_to_clients();
 717         }
 718
 719         public void failed() {
 720         }
 721
 722         public void error(String reason) {
 723                 stop_idle_monitor();
 724         }
 725 }