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   1 /**
   2  * Copyright (c) 2010-2020 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.bluetooth.bluez.handler;
  14
  15 import java.util.List;
  16 import java.util.concurrent.ScheduledFuture;
  17 import java.util.concurrent.TimeUnit;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.openhab.binding.bluetooth.AbstractBluetoothBridgeHandler;
  22 import org.openhab.binding.bluetooth.BluetoothAddress;
  23 import org.openhab.binding.bluetooth.bluez.BlueZBluetoothDevice;
  24 import org.openhab.core.thing.Bridge;
  25 import org.openhab.core.thing.ThingStatus;
  26 import org.openhab.core.thing.ThingStatusDetail;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 import tinyb.BluetoothException;
  31 import tinyb.BluetoothManager;
  32
  33 /**
  34  * The {@link BlueZBridgeHandler} is responsible for talking to the BlueZ stack.
  35  * It provides a private interface for {@link BlueZBluetoothDevice}s to access the stack and provides top
  36  * level adaptor functionality for scanning and arbitration.
  37  *
  38  * @author Kai Kreuzer - Initial contribution and API
  39  * @author Hilbrand Bouwkamp - Simplified calling scan and better handling manual scanning
  40  * @author Connor Petty - Simplified device scan logic
  41  */
  42 @NonNullByDefault
  43 public class BlueZBridgeHandler extends AbstractBluetoothBridgeHandler<BlueZBluetoothDevice> {
  44
  45     private final Logger logger = LoggerFactory.getLogger(BlueZBridgeHandler.class);
  46
  47     private @NonNullByDefault({}) tinyb.BluetoothAdapter adapter;
  48
  49     // Our BT address
  50     private @NonNullByDefault({}) BluetoothAddress adapterAddress;
  51
  52     private @NonNullByDefault({}) ScheduledFuture<?> discoveryJob;
  53
  54     /**
  55      * Constructor
  56      *
  57      * @param bridge the bridge definition for this handler
  58      */
  59     public BlueZBridgeHandler(Bridge bridge) {
  60         super(bridge);
  61     }
  62
  63     @Override
  64     public void initialize() {
  65         super.initialize();
  66         BluetoothManager manager;
  67         try {
  68             manager = BluetoothManager.getBluetoothManager();
  69             if (manager == null) {
  70                 throw new IllegalStateException("Received null BlueZ manager");
  71             }
  72         } catch (UnsatisfiedLinkError e) {
  73             throw new IllegalStateException("BlueZ JNI connection cannot be established.", e);
  74         } catch (RuntimeException e) {
  75             // we do not get anything more specific from TinyB here
  76             if (e.getMessage() != null && e.getMessage().contains("AccessDenied")) {
  77                 throw new IllegalStateException(
  78                         "Cannot access BlueZ stack due to permission problems. Make sure that your OS user is part of the 'bluetooth' group of BlueZ.");
  79             } else {
  80                 throw new IllegalStateException("Cannot access BlueZ layer.", e);
  81             }
  82         }
  83
  84         final BlueZAdapterConfiguration configuration = getConfigAs(BlueZAdapterConfiguration.class);
  85         if (configuration.address != null) {
  86             adapterAddress = new BluetoothAddress(configuration.address);
  87         } else {
  88             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "address not set");
  89             return;
  90         }
  91
  92         logger.debug("Creating BlueZ adapter with address '{}'", adapterAddress);
  93
  94         for (tinyb.BluetoothAdapter adapter : manager.getAdapters()) {
  95             if (adapter == null) {
  96                 logger.warn("got null adapter from bluetooth manager");
  97                 continue;
  98             }
  99             if (adapter.getAddress().equals(adapterAddress.toString())) {
 100                 this.adapter = adapter;
 101                 discoveryJob = scheduler.scheduleWithFixedDelay(this::refreshDevices, 0, 10, TimeUnit.SECONDS);
 102                 return;
 103             }
 104         }
 105         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "No adapter for this address found.");
 106     }
 107
 108     private void startDiscovery() {
 109         // we need to make sure the adapter is powered first
 110         if (!adapter.getPowered()) {
 111             adapter.setPowered(true);
 112         }
 113         if (!adapter.getDiscovering()) {
 114             adapter.setRssiDiscoveryFilter(-96);
 115             adapter.startDiscovery();
 116         }
 117     }
 118
 119     private void refreshDevices() {
 120         refreshTry: try {
 121             logger.debug("Refreshing Bluetooth device list...");
 122             List<tinyb.BluetoothDevice> tinybDevices = adapter.getDevices();
 123             logger.debug("Found {} Bluetooth devices.", tinybDevices.size());
 124             for (tinyb.BluetoothDevice tinybDevice : tinybDevices) {
 125                 BlueZBluetoothDevice device = getDevice(new BluetoothAddress(tinybDevice.getAddress()));
 126                 device.updateTinybDevice(tinybDevice);
 127                 deviceDiscovered(device);
 128             }
 129             // For whatever reason, bluez will sometimes turn off scanning. So we just make sure it keeps running.
 130             startDiscovery();
 131         } catch (BluetoothException ex) {
 132             String message = ex.getMessage();
 133             if (message != null) {
 134                 if (message.contains("Operation already in progress")) {
 135                     // we shouldn't go offline in this case
 136                     break refreshTry;
 137                 }
 138                 int idx = message.lastIndexOf(':');
 139                 if (idx != -1) {
 140                     message = message.substring(idx).trim();
 141                 }
 142             }
 143             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, message);
 144             return;
 145         }
 146         updateStatus(ThingStatus.ONLINE);
 147     }
 148
 149     @Override
 150     public @Nullable BluetoothAddress getAddress() {
 151         return adapterAddress;
 152     }
 153
 154     @Override
 155     protected BlueZBluetoothDevice createDevice(BluetoothAddress address) {
 156         BlueZBluetoothDevice device = new BlueZBluetoothDevice(this, address);
 157         device.initialize();
 158         return device;
 159     }
 160
 161     @Override
 162     public void dispose() {
 163         if (discoveryJob != null) {
 164             discoveryJob.cancel(true);
 165             discoveryJob = null;
 166         }
 167         if (adapter != null && adapter.getDiscovering()) {
 168             adapter.stopDiscovery();
 169         }
 170         super.dispose();
 171     }
 172 }