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   1 /**
   2  * Copyright (c) 2010-2021 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.danfossairunit.internal.discovery;
  14
  15 import static org.openhab.binding.danfossairunit.internal.DanfossAirUnitBindingConstants.*;
  16
  17 import java.io.IOException;
  18 import java.net.DatagramPacket;
  19 import java.net.DatagramSocket;
  20 import java.net.InetAddress;
  21 import java.net.InterfaceAddress;
  22 import java.net.NetworkInterface;
  23 import java.net.SocketTimeoutException;
  24 import java.util.Arrays;
  25 import java.util.Enumeration;
  26 import java.util.HashMap;
  27 import java.util.Map;
  28 import java.util.Set;
  29
  30 import org.eclipse.jdt.annotation.NonNullByDefault;
  31 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  32 import org.openhab.core.config.discovery.DiscoveryResult;
  33 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  34 import org.openhab.core.config.discovery.DiscoveryService;
  35 import org.openhab.core.thing.ThingTypeUID;
  36 import org.openhab.core.thing.ThingUID;
  37 import org.osgi.service.component.annotations.Component;
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40
  41 /**
  42  * The Discovery service implementation to scan for available air units in the network via broadcast.
  43  *
  44  * @author Ralf Duckstein - Initial contribution
  45  * @author Robert Bach - heavy refactorings
  46  */
  47 @Component(service = DiscoveryService.class)
  48 @NonNullByDefault
  49 public class DanfossAirUnitDiscoveryService extends AbstractDiscoveryService {
  50
  51     private static final int BROADCAST_PORT = 30045;
  52     private static final byte[] DISCOVER_SEND = { 0x0c, 0x00, 0x30, 0x00, 0x11, 0x00, 0x12, 0x00, 0x13 };
  53     private static final byte[] DISCOVER_RECEIVE = { 0x0d, 0x00, 0x07, 0x00, 0x02, 0x02, 0x00 };
  54     private static final int TIMEOUT_IN_SECONDS = 15;
  55
  56     private final Logger logger = LoggerFactory.getLogger(DanfossAirUnitDiscoveryService.class);
  57
  58     public DanfossAirUnitDiscoveryService() {
  59         super(SUPPORTED_THING_TYPES_UIDS, TIMEOUT_IN_SECONDS, true);
  60     }
  61
  62     @Override
  63     public Set<ThingTypeUID> getSupportedThingTypes() {
  64         return SUPPORTED_THING_TYPES_UIDS;
  65     }
  66
  67     @Override
  68     protected void startBackgroundDiscovery() {
  69         logger.debug("Start Danfoss Air CCM background discovery");
  70         scheduler.execute(this::discover);
  71     }
  72
  73     @Override
  74     public void startScan() {
  75         logger.debug("Start Danfoss Air CCM scan");
  76         discover();
  77     }
  78
  79     private synchronized void discover() {
  80         logger.debug("Try to discover all Danfoss Air CCM devices");
  81
  82         try (DatagramSocket socket = new DatagramSocket()) {
  83
  84             Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
  85             while (interfaces.hasMoreElements()) {
  86                 NetworkInterface networkInterface = interfaces.nextElement();
  87                 if (networkInterface.isLoopback() || !networkInterface.isUp()) {
  88                     continue;
  89                 }
  90                 for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses()) {
  91                     if (interfaceAddress.getBroadcast() == null) {
  92                         continue;
  93                     }
  94                     logger.debug("Sending broadcast on interface {} to discover Danfoss Air CCM device...",
  95                             interfaceAddress.getAddress());
  96                     sendBroadcastToDiscoverThing(socket, interfaceAddress.getBroadcast());
  97                 }
  98             }
  99
 100         } catch (IOException e) {
 101             logger.debug("No Danfoss Air CCM device found. Diagnostic: {}", e.getMessage());
 102         }
 103     }
 104
 105     private void sendBroadcastToDiscoverThing(DatagramSocket socket, InetAddress broadcastAddress) throws IOException {
 106         socket.setBroadcast(true);
 107         socket.setSoTimeout(500);
 108         // send discover
 109         byte[] sendBuffer = DISCOVER_SEND;
 110         DatagramPacket sendPacket = new DatagramPacket(sendBuffer, sendBuffer.length, broadcastAddress, BROADCAST_PORT);
 111         socket.send(sendPacket);
 112         logger.debug("Discover message sent");
 113
 114         // wait for responses
 115         while (true) {
 116             byte[] receiveBuffer = new byte[7];
 117             DatagramPacket receivePacket = new DatagramPacket(receiveBuffer, receiveBuffer.length);
 118             try {
 119                 socket.receive(receivePacket);
 120             } catch (SocketTimeoutException e) {
 121                 break; // leave the endless loop
 122             }
 123
 124             byte[] data = receivePacket.getData();
 125             if (Arrays.equals(data, DISCOVER_RECEIVE)) {
 126                 logger.debug("Discover received correct response");
 127
 128                 String host = receivePacket.getAddress().getHostName();
 129                 Map<String, Object> properties = new HashMap<>();
 130                 properties.put("host", host);
 131
 132                 logger.debug("Adding a new Danfoss Air Unit CCM '{}' to inbox", host);
 133
 134                 ThingUID uid = new ThingUID(THING_TYPE_AIRUNIT, String.valueOf(receivePacket.getAddress().hashCode()));
 135
 136                 DiscoveryResult result = DiscoveryResultBuilder.create(uid).withRepresentationProperty("host")
 137                         .withProperties(properties).withLabel("Danfoss HRV").build();
 138                 thingDiscovered(result);
 139
 140                 logger.debug("Thing discovered '{}'", result);
 141             }
 142         }
 143     }
 144 }