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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.io.*;
  24 import java.util.*;
  25
  26 import android.app.*;
  27 import android.bluetooth.BluetoothDevice;
  28 import android.bluetooth.BluetoothAdapter;
  29 import android.graphics.Color;
  30 import android.hardware.usb.*;
  31 import android.content.Intent;
  32 import android.content.Context;
  33 import android.os.*;
  34 import android.os.Build.*;
  35 import android.widget.Toast;
  36 import androidx.core.app.NotificationCompat;
  37
  38 import org.altusmetrum.altoslib_14.*;
  39
  40 public class TelemetryService extends Service implements AltosIdleMonitorListener {
  41
  42         static final int MSG_REGISTER_CLIENT   = 1;
  43         static final int MSG_UNREGISTER_CLIENT = 2;
  44         static final int MSG_CONNECT           = 3;
  45         static final int MSG_OPEN_USB          = 4;
  46         static final int MSG_CONNECTED         = 5;
  47         static final int MSG_CONNECT_FAILED    = 6;
  48         static final int MSG_DISCONNECTED      = 7;
  49         static final int MSG_TELEMETRY         = 8;
  50         static final int MSG_SETFREQUENCY      = 9;
  51         static final int MSG_CRC_ERROR         = 10;
  52         static final int MSG_SETBAUD           = 11;
  53         static final int MSG_DISCONNECT        = 12;
  54         static final int MSG_DELETE_SERIAL     = 13;
  55         static final int MSG_BLUETOOTH_ENABLED = 14;
  56         static final int MSG_MONITOR_IDLE_START= 15;
  57         static final int MSG_MONITOR_IDLE_STOP = 16;
  58         static final int MSG_REBOOT            = 17;
  59         static final int MSG_IGNITER_QUERY     = 18;
  60         static final int MSG_IGNITER_FIRE      = 19;
  61
  62         // Unique Identification Number for the Notification.
  63         // We use it on Notification start, and to cancel it.
  64         private int NOTIFICATION = R.string.telemetry_service_label;
  65         //private NotificationManager mNM;
  66
  67         ArrayList<Messenger> clients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  68         final Handler   handler   = new IncomingHandler(this);
  69         final Messenger messenger = new Messenger(handler); // Target we publish for clients to send messages to IncomingHandler.
  70
  71         // Name of the connected device
  72         DeviceAddress address;
  73         private AltosDroidLink  altos_link  = null;
  74         private TelemetryReader telemetry_reader = null;
  75         private TelemetryLogger telemetry_logger = null;
  76
  77         // Local Bluetooth adapter
  78         private BluetoothAdapter bluetooth_adapter = null;
  79
  80         // Last data seen; send to UI when it starts
  81         private TelemetryState  telemetry_state;
  82
  83         // Idle monitor if active
  84         AltosIdleMonitor idle_monitor = null;
  85
  86         // Igniter bits
  87         AltosIgnite ignite = null;
  88         boolean ignite_running;
  89
  90         // Handler of incoming messages from clients.
  91         static class IncomingHandler extends Handler {
  92                 private final WeakReference<TelemetryService> service;
  93                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  94
  95                 @Override
  96                 public void handleMessage(Message msg) {
  97                         DeviceAddress address;
  98
  99                         TelemetryService s = service.get();
 100                         AltosDroidLink bt = null;
 101                         if (s == null)
 102                                 return;
 103
 104                         switch (msg.what) {
 105
 106                                 /* Messages from application */
 107                         case MSG_REGISTER_CLIENT:
 108                                 s.add_client(msg.replyTo);
 109                                 break;
 110                         case MSG_UNREGISTER_CLIENT:
 111                                 s.remove_client(msg.replyTo);
 112                                 break;
 113                         case MSG_CONNECT:
 114                                 AltosDebug.debug("Connect command received");
 115                                 address = (DeviceAddress) msg.obj;
 116                                 AltosDroidPreferences.set_active_device(address);
 117                                 s.start_altos_bluetooth(address, false);
 118                                 break;
 119                         case MSG_OPEN_USB:
 120                                 AltosDebug.debug("Open USB command received");
 121                                 UsbDevice device = (UsbDevice) msg.obj;
 122                                 s.start_usb(device);
 123                                 break;
 124                         case MSG_DISCONNECT:
 125                                 AltosDebug.debug("Disconnect command received");
 126                                 s.address = null;
 127                                 if (!(Boolean) msg.obj)
 128                                         AltosDroidPreferences.set_active_device(null);
 129                                 s.disconnect(true);
 130                                 break;
 131                         case MSG_DELETE_SERIAL:
 132                                 AltosDebug.debug("Delete Serial command received");
 133                                 s.delete_serial((Integer) msg.obj);
 134                                 break;
 135                         case MSG_SETFREQUENCY:
 136                                 AltosDebug.debug("MSG_SETFREQUENCY");
 137                                 s.telemetry_state.frequency = (Double) msg.obj;
 138                                 if (s.idle_monitor != null) {
 139                                         s.idle_monitor.set_frequency(s.telemetry_state.frequency);
 140                                 } else if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 141                                         try {
 142                                                 s.altos_link.set_radio_frequency(s.telemetry_state.frequency);
 143                                                 s.altos_link.save_frequency();
 144                                         } catch (InterruptedException e) {
 145                                         } catch (TimeoutException e) {
 146                                         }
 147                                 }
 148                                 s.send_to_clients();
 149                                 break;
 150                         case MSG_SETBAUD:
 151                                 AltosDebug.debug("MSG_SETBAUD");
 152                                 s.telemetry_state.telemetry_rate = (Integer) msg.obj;
 153                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 154                                         s.altos_link.set_telemetry_rate(s.telemetry_state.telemetry_rate);
 155                                         s.altos_link.save_telemetry_rate();
 156                                 }
 157                                 s.send_to_clients();
 158                                 break;
 159
 160                                 /*
 161                                  *Messages from AltosBluetooth
 162                                  */
 163                         case MSG_CONNECTED:
 164                                 AltosDebug.debug("MSG_CONNECTED");
 165                                 bt = (AltosDroidLink) msg.obj;
 166
 167                                 if (bt != s.altos_link) {
 168                                         AltosDebug.debug("Stale message");
 169                                         break;
 170                                 }
 171                                 AltosDebug.debug("Connected to device");
 172                                 try {
 173                                         s.connected();
 174                                 } catch (InterruptedException ie) {
 175                                 }
 176                                 break;
 177                         case MSG_CONNECT_FAILED:
 178                                 AltosDebug.debug("MSG_CONNECT_FAILED");
 179                                 bt = (AltosDroidLink) msg.obj;
 180
 181                                 if (bt != s.altos_link) {
 182                                         AltosDebug.debug("Stale message");
 183                                         break;
 184                                 }
 185                                 if (s.address != null) {
 186                                         AltosDebug.debug("Connection failed... retrying");
 187                                         s.start_altos_bluetooth(s.address, true);
 188                                 } else {
 189                                         s.disconnect(true);
 190                                 }
 191                                 break;
 192                         case MSG_DISCONNECTED:
 193
 194                                 /* This can be sent by either AltosDroidLink or TelemetryReader */
 195                                 AltosDebug.debug("MSG_DISCONNECTED");
 196                                 bt = (AltosDroidLink) msg.obj;
 197
 198                                 if (bt != s.altos_link) {
 199                                         AltosDebug.debug("Stale message");
 200                                         break;
 201                                 }
 202                                 if (s.address != null) {
 203                                         AltosDebug.debug("Connection lost... retrying");
 204                                         s.start_altos_bluetooth(s.address, true);
 205                                 } else {
 206                                         s.disconnect(true);
 207                                 }
 208                                 break;
 209
 210                                 /*
 211                                  * Messages from TelemetryReader
 212                                  */
 213                         case MSG_TELEMETRY:
 214                                 s.telemetry((AltosTelemetry) msg.obj);
 215                                 break;
 216                         case MSG_CRC_ERROR:
 217                                 // forward crc error messages
 218                                 s.telemetry_state.crc_errors = (Integer) msg.obj;
 219                                 s.send_to_clients();
 220                                 break;
 221                         case MSG_BLUETOOTH_ENABLED:
 222                                 AltosDebug.debug("TelemetryService notes that BT is now enabled");
 223                                 address = AltosDroidPreferences.active_device();
 224                                 if (address != null && !address.address.startsWith("USB"))
 225                                         s.start_altos_bluetooth(address, false);
 226                                 break;
 227                         case MSG_MONITOR_IDLE_START:
 228                                 AltosDebug.debug("start monitor idle");
 229                                 s.start_idle_monitor();
 230                                 break;
 231                         case MSG_MONITOR_IDLE_STOP:
 232                                 AltosDebug.debug("stop monitor idle");
 233                                 s.stop_idle_monitor();
 234                                 break;
 235                         case MSG_REBOOT:
 236                                 AltosDebug.debug("reboot");
 237                                 s.reboot_remote();
 238                                 break;
 239                         case MSG_IGNITER_QUERY:
 240                                 AltosDebug.debug("igniter query");
 241                                 s.igniter_query(msg.replyTo);
 242                                 break;
 243                         case MSG_IGNITER_FIRE:
 244                                 AltosDebug.debug("igniter fire");
 245                                 s.igniter_fire((String) msg.obj);
 246                                 break;
 247                         default:
 248                                 super.handleMessage(msg);
 249                         }
 250                 }
 251         }
 252
 253         /* Handle telemetry packet
 254          */
 255         private void telemetry(AltosTelemetry telem) {
 256                 AltosState      state;
 257
 258                 state = telemetry_state.get(telem.serial());
 259                 if (state == null)
 260                         state = new AltosState(new AltosCalData());
 261                 telem.provide_data(state);
 262                 telemetry_state.put(telem.serial(), state);
 263                 telemetry_state.quiet = false;
 264                 if (state != null) {
 265                         AltosPreferences.set_state(state,telem.serial());
 266                 }
 267                 send_to_clients();
 268         }
 269
 270         /* Construct the message to deliver to clients
 271          */
 272         private Message message() {
 273                 if (telemetry_state == null)
 274                         AltosDebug.debug("telemetry_state null!");
 275                 return Message.obtain(null, AltosDroid.MSG_STATE, telemetry_state);
 276         }
 277
 278         /* A new friend has connected
 279          */
 280         private void add_client(Messenger client) {
 281
 282                 clients.add(client);
 283                 AltosDebug.debug("Client bound to service");
 284
 285                 /* On connect, send the current state to the new client
 286                  */
 287                 send_to_client(client);
 288                 send_idle_mode_to_client(client);
 289
 290                 /* If we've got an address from a previous session, then
 291                  * go ahead and try to reconnect to the device
 292                  */
 293                 if (address != null && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 294                         AltosDebug.debug("Reconnecting now...");
 295                         start_altos_bluetooth(address, false);
 296                 }
 297         }
 298
 299         /* A client has disconnected, clean up
 300          */
 301         private void remove_client(Messenger client) {
 302                 clients.remove(client);
 303                 AltosDebug.debug("Client unbound from service");
 304
 305                 /* When the list of clients is empty, stop the service if
 306                  * we have no current telemetry source
 307                  */
 308
 309                  if (clients.isEmpty() && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 310                          AltosDebug.debug("No clients, no connection. Stopping\n");
 311                          stopSelf();
 312                  }
 313         }
 314
 315         private void send_to_client(Messenger client) {
 316                 Message m = message();
 317                 try {
 318                         client.send(m);
 319                 } catch (RemoteException e) {
 320                         AltosDebug.error("Client %s disappeared", client.toString());
 321                         remove_client(client);
 322                 }
 323         }
 324
 325         private void send_to_clients() {
 326                 for (Messenger client : clients)
 327                         send_to_client(client);
 328         }
 329
 330         private void send_idle_mode_to_client(Messenger client) {
 331                 Message m = Message.obtain(null, AltosDroid.MSG_IDLE_MODE, idle_monitor != null);
 332                 try {
 333                         client.send(m);
 334                 } catch (RemoteException e) {
 335                         AltosDebug.error("Client %s disappeared", client.toString());
 336                         remove_client(client);
 337                 }
 338         }
 339
 340         private void send_idle_mode_to_clients() {
 341                 for (Messenger client : clients)
 342                         send_idle_mode_to_client(client);
 343         }
 344
 345         private void send_file_failed_to_client(Messenger client, File f) {
 346                 Message m = Message.obtain(null, AltosDroid.MSG_FILE_FAILED, f);
 347                 try {
 348                         client.send(m);
 349                 } catch (RemoteException e) {
 350                         AltosDebug.error("Client %s disappeared", client.toString());
 351                         remove_client(client);
 352                 }
 353         }
 354
 355         public void send_file_failed_to_clients(File f) {
 356                 for (Messenger client : clients)
 357                         send_file_failed_to_client(client, f);
 358         }
 359
 360         private void telemetry_start() {
 361                 if (telemetry_reader == null && idle_monitor == null && !ignite_running) {
 362                         telemetry_reader = new TelemetryReader(altos_link, handler);
 363                         telemetry_reader.start();
 364                 }
 365         }
 366
 367         private void telemetry_stop() {
 368                 if (telemetry_reader != null) {
 369                         AltosDebug.debug("disconnect(): stopping TelemetryReader");
 370                         telemetry_reader.interrupt();
 371                         try {
 372                                 telemetry_reader.join();
 373                         } catch (InterruptedException e) {
 374                         }
 375                         telemetry_reader = null;
 376                 }
 377         }
 378
 379         private void disconnect(boolean notify) {
 380                 AltosDebug.debug("disconnect(): begin");
 381
 382                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 383                 telemetry_state.address = null;
 384
 385                 if (idle_monitor != null)
 386                         stop_idle_monitor();
 387
 388                 if (altos_link != null)
 389                         altos_link.closing();
 390
 391                 stop_receiver_voltage_timer();
 392
 393                 telemetry_stop();
 394                 if (telemetry_logger != null) {
 395                         AltosDebug.debug("disconnect(): stopping TelemetryLogger");
 396                         telemetry_logger.stop();
 397                         telemetry_logger = null;
 398                 }
 399                 if (altos_link != null) {
 400                         AltosDebug.debug("disconnect(): stopping AltosDroidLink");
 401                         altos_link.close();
 402                         altos_link = null;
 403                         ignite = null;
 404                 }
 405                 telemetry_state.config = null;
 406                 if (notify) {
 407                         AltosDebug.debug("disconnect(): send message to clients");
 408                         send_to_clients();
 409                         if (clients.isEmpty()) {
 410                                 AltosDebug.debug("disconnect(): no clients, terminating");
 411                                 stopSelf();
 412                         }
 413                 }
 414         }
 415
 416         private void start_usb(UsbDevice device) {
 417                 AltosUsb        d = new AltosUsb(this, device, handler);
 418
 419                 if (d != null) {
 420                         disconnect(false);
 421                         altos_link = d;
 422                         try {
 423                                 connected();
 424                         } catch (InterruptedException ie) {
 425                         }
 426                 }
 427         }
 428
 429         private void delete_serial(int serial) {
 430                 telemetry_state.remove(serial);
 431                 AltosPreferences.remove_state(serial);
 432                 send_to_clients();
 433         }
 434
 435         private void start_altos_bluetooth(DeviceAddress address, boolean pause) {
 436                 if (bluetooth_adapter == null || !bluetooth_adapter.isEnabled() || address.address == null)
 437                         return;
 438
 439                 disconnect(false);
 440
 441                 // Get the BluetoothDevice object
 442                 BluetoothDevice device = bluetooth_adapter.getRemoteDevice(address.address);
 443
 444                 this.address = address;
 445                 AltosDebug.debug("start_altos_bluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress());
 446                 altos_link = new AltosBluetooth(device, handler, pause);
 447                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTING;
 448                 telemetry_state.address = address;
 449                 send_to_clients();
 450         }
 451
 452         private void start_idle_monitor() {
 453                 if (altos_link != null && idle_monitor == null) {
 454                         telemetry_stop();
 455                         idle_monitor = new AltosIdleMonitor(this, altos_link, true, false);
 456                         idle_monitor.set_callsign(AltosPreferences.callsign());
 457                         idle_monitor.set_frequency(telemetry_state.frequency);
 458                         telemetry_state.idle_mode = true;
 459                         idle_monitor.start();
 460                         send_idle_mode_to_clients();
 461                 }
 462         }
 463
 464         private void stop_idle_monitor() {
 465                 if (idle_monitor != null) {
 466                         try {
 467                                 idle_monitor.abort();
 468                         } catch (InterruptedException ie) {
 469                         }
 470                         idle_monitor = null;
 471                         telemetry_state.idle_mode = false;
 472                         telemetry_start();
 473                         send_idle_mode_to_clients();
 474                 }
 475         }
 476
 477         private void reboot_remote() {
 478                 if (altos_link != null) {
 479                         stop_idle_monitor();
 480                         try {
 481                                 altos_link.start_remote();
 482                                 altos_link.printf("r eboot\n");
 483                                 altos_link.flush_output();
 484                         } catch (TimeoutException te) {
 485                         } catch (InterruptedException ie) {
 486                         } finally {
 487                                 try {
 488                                         altos_link.stop_remote();
 489                                 } catch (InterruptedException ie) {
 490                                 }
 491                         }
 492                 }
 493         }
 494
 495         private void ensure_ignite() {
 496                 if (ignite == null)
 497                         ignite = new AltosIgnite(altos_link, true, false);
 498         }
 499
 500         private synchronized void igniter_query(Messenger client) {
 501                 ensure_ignite();
 502                 HashMap<String,Integer> status_map = null;
 503                 ignite_running = true;
 504                 try {
 505                         stop_idle_monitor();
 506                         try {
 507                                 status_map = ignite.status();
 508                         } catch (InterruptedException ie) {
 509                                 AltosDebug.debug("ignite.status interrupted");
 510                         } catch (TimeoutException te) {
 511                                 AltosDebug.debug("ignite.status timeout");
 512                         }
 513                 } finally {
 514                         ignite_running = false;
 515                 }
 516                 Message m = Message.obtain(null, AltosDroid.MSG_IGNITER_STATUS, status_map);
 517                 try {
 518                         client.send(m);
 519                 } catch (RemoteException e) {
 520                 }
 521         }
 522
 523         private synchronized void igniter_fire(String igniter) {
 524                 ensure_ignite();
 525                 ignite_running = true;
 526                 stop_idle_monitor();
 527                 try {
 528                         ignite.fire(igniter);
 529                 } catch (InterruptedException ie) {
 530                 } finally {
 531                         ignite_running = false;
 532                 }
 533         }
 534
 535         // Timer for receiver battery voltage monitoring
 536         Timer receiver_voltage_timer;
 537
 538         private void update_receiver_voltage() {
 539                 if (altos_link != null && idle_monitor == null && !ignite_running) {
 540                         try {
 541                                 double  voltage = altos_link.monitor_battery();
 542                                 telemetry_state.receiver_battery = voltage;
 543                                 send_to_clients();
 544                         } catch (InterruptedException ie) {
 545                         }
 546                 }
 547         }
 548
 549         private void stop_receiver_voltage_timer() {
 550                 if (receiver_voltage_timer != null) {
 551                         receiver_voltage_timer.cancel();
 552                         receiver_voltage_timer.purge();
 553                         receiver_voltage_timer = null;
 554                 }
 555         }
 556
 557         private void start_receiver_voltage_timer() {
 558                 if (receiver_voltage_timer == null && altos_link.has_monitor_battery()) {
 559                         receiver_voltage_timer = new Timer();
 560                         receiver_voltage_timer.scheduleAtFixedRate(new TimerTask() { public void run() {update_receiver_voltage();}}, 1000L, 10000L);
 561                 }
 562         }
 563
 564         private void connected() throws InterruptedException {
 565                 AltosDebug.debug("connected top");
 566                 AltosDebug.check_ui("connected\n");
 567                 try {
 568                         if (altos_link == null)
 569                                 throw new InterruptedException("no bluetooth");
 570                         telemetry_state.config = altos_link.config_data();
 571                         altos_link.set_radio_frequency(telemetry_state.frequency);
 572                         altos_link.set_telemetry_rate(telemetry_state.telemetry_rate);
 573                 } catch (TimeoutException e) {
 574                         // If this timed out, then we really want to retry it, but
 575                         // probably safer to just retry the connection from scratch.
 576                         AltosDebug.debug("connected timeout");
 577                         if (address != null) {
 578                                 AltosDebug.debug("connected timeout, retrying");
 579                                 start_altos_bluetooth(address, true);
 580                         } else {
 581                                 handler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 582                                 disconnect(true);
 583                         }
 584                         return;
 585                 }
 586
 587                 AltosDebug.debug("connected bluetooth configured");
 588                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTED;
 589                 telemetry_state.address = address;
 590
 591                 telemetry_start();
 592
 593                 AltosDebug.debug("connected TelemetryReader started");
 594
 595                 telemetry_logger = new TelemetryLogger(this, altos_link);
 596
 597                 start_receiver_voltage_timer();
 598
 599                 AltosDebug.debug("Notify UI of connection");
 600
 601                 send_to_clients();
 602         }
 603
 604
 605         @Override
 606         public void onCreate() {
 607
 608                 AltosDebug.init(this);
 609
 610                 // Initialise preferences
 611                 AltosDroidPreferences.init(this);
 612
 613                 // Get local Bluetooth adapter
 614                 bluetooth_adapter = BluetoothAdapter.getDefaultAdapter();
 615
 616                 telemetry_state = new TelemetryState();
 617
 618                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 619                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 620
 621                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 622                 telemetry_state.address = null;
 623
 624                 /* Pull the saved state information out of the preferences database
 625                  */
 626                 ArrayList<Integer> serials = AltosPreferences.list_states();
 627
 628                 telemetry_state.latest_serial = AltosPreferences.latest_state();
 629
 630                 telemetry_state.quiet = true;
 631
 632                 AltosDebug.debug("latest serial %d\n", telemetry_state.latest_serial);
 633
 634                 for (int serial : serials) {
 635                         AltosState saved_state = AltosPreferences.state(serial);
 636                         if (saved_state != null) {
 637                                 AltosDebug.debug("recovered old state serial %d flight %d",
 638                                                  serial,
 639                                                  saved_state.cal_data().flight);
 640                                 if (saved_state.gps != null)
 641                                         AltosDebug.debug("\tposition %f,%f",
 642                                                          saved_state.gps.lat,
 643                                                          saved_state.gps.lon);
 644                                 telemetry_state.put(serial, saved_state);
 645                         } else {
 646                                 AltosDebug.debug("Failed to recover state for %d", serial);
 647                                 AltosPreferences.remove_state(serial);
 648                         }
 649                 }
 650         }
 651
 652
 653         private String createNotificationChannel(String channelId, String channelName) {
 654                 NotificationChannel chan = new NotificationChannel(
 655                                 channelId, channelName, NotificationManager.IMPORTANCE_NONE);
 656                 chan.setLightColor(Color.BLUE);
 657                 chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
 658                 NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 659                 service.createNotificationChannel(chan);
 660                 return channelId;
 661         }
 662
 663         @Override
 664         public int onStartCommand(Intent intent, int flags, int startId) {
 665                 AltosDebug.debug("Received start id %d: %s", startId, intent);
 666                 int             flag;
 667
 668                 if (android.os.Build.VERSION.SDK_INT >= 31) // android.os.Build.VERSION_CODES.S
 669                         flag = 33554432; // PendingIntent.FLAG_MUTABLE
 670                 else
 671                         flag = 0;
 672
 673                 // The PendingIntent to launch our activity if the user selects this notification
 674                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 675                                 new Intent(this, AltosDroid.class), flag);
 676
 677                 String channelId =
 678                                 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
 679                                                 ? createNotificationChannel("altosdroid_telemetry", "AltosDroid Telemetry Service")
 680                                                 : "";
 681
 682                 // Create notification to be displayed while the service runs
 683                 Notification notification = new NotificationCompat.Builder(this, channelId)
 684                                 .setContentTitle(getText(R.string.telemetry_service_label))
 685                                 .setContentText(getText(R.string.telemetry_service_started))
 686                                 .setContentIntent(contentIntent)
 687                                 .setWhen(System.currentTimeMillis())
 688                                 .setOngoing(true)
 689                                 .setSmallIcon(R.drawable.am_status_c)
 690 //                              .setLargeIcon(R.drawable.am_status_c)
 691                                 .build();
 692
 693                 // Move us into the foreground.
 694                 startForeground(NOTIFICATION, notification);
 695
 696                 /* Start bluetooth if we don't have a connection already */
 697                 if (intent != null &&
 698                     (telemetry_state.connect == TelemetryState.CONNECT_NONE ||
 699                      telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED))
 700                 {
 701                         String  action = intent.getAction();
 702
 703                         if (action.equals(AltosDroid.ACTION_BLUETOOTH)) {
 704                                 DeviceAddress address = AltosDroidPreferences.active_device();
 705                                 if (address != null && !address.address.startsWith("USB"))
 706                                         start_altos_bluetooth(address, false);
 707                         }
 708                 }
 709
 710                 // We want this service to continue running until it is explicitly
 711                 // stopped, so return sticky.
 712                 return START_STICKY;
 713         }
 714
 715         @Override
 716         public void onDestroy() {
 717
 718                 // Stop the bluetooth Comms threads
 719                 disconnect(true);
 720
 721                 // Demote us from the foreground, and cancel the persistent notification.
 722                 stopForeground(true);
 723
 724                 // Tell the user we stopped.
 725                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 726         }
 727
 728         @Override
 729         public IBinder onBind(Intent intent) {
 730                 return messenger.getBinder();
 731         }
 732
 733         /* AltosIdleMonitorListener */
 734         public void update(AltosState state, AltosListenerState listener_state) {
 735                 if (state != null)
 736                         AltosDebug.debug("update call %s freq %7.3f", state.cal_data().callsign, state.frequency);
 737                 telemetry_state.put(state.cal_data().serial, state);
 738                 telemetry_state.receiver_battery = listener_state.battery;
 739                 send_to_clients();
 740         }
 741
 742         public void failed() {
 743         }
 744
 745         public void error(String reason) {
 746                 stop_idle_monitor();
 747         }
 748 }