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