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   1 /**
   2  * Copyright (c) 2010-2023 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.homematic.internal.discovery;
  14
  15 import static org.openhab.binding.homematic.internal.HomematicBindingConstants.THING_TYPE_BRIDGE;
  16
  17 import java.io.IOException;
  18 import java.net.DatagramPacket;
  19 import java.net.InetAddress;
  20 import java.net.MulticastSocket;
  21 import java.net.SocketTimeoutException;
  22 import java.util.Set;
  23 import java.util.concurrent.Future;
  24
  25 import org.openhab.binding.homematic.internal.discovery.eq3udp.Eq3UdpRequest;
  26 import org.openhab.binding.homematic.internal.discovery.eq3udp.Eq3UdpResponse;
  27 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  28 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  29 import org.openhab.core.config.discovery.DiscoveryService;
  30 import org.openhab.core.net.NetworkAddressService;
  31 import org.openhab.core.thing.ThingUID;
  32 import org.osgi.service.component.annotations.Component;
  33 import org.osgi.service.component.annotations.Reference;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * Discovers Homematic CCU's and adds the results to the inbox.
  39  *
  40  * @author Gerhard Riegler - Initial contribution
  41  */
  42 @Component(service = DiscoveryService.class, configurationPid = "discovery.homematic")
  43 public class CcuDiscoveryService extends AbstractDiscoveryService {
  44     private final Logger logger = LoggerFactory.getLogger(CcuDiscoveryService.class);
  45
  46     private static final int RECEIVE_TIMEOUT_MSECS = 3000;
  47     private InetAddress broadcastAddress;
  48     private MulticastSocket socket;
  49     private Future<?> scanFuture;
  50     private NetworkAddressService networkAddressService;
  51
  52     public CcuDiscoveryService() {
  53         super(Set.of(THING_TYPE_BRIDGE), 5, true);
  54     }
  55
  56     @Override
  57     protected void startScan() {
  58         if (scanFuture == null) {
  59             scanFuture = scheduler.submit(this::startDiscovery);
  60         } else {
  61             logger.debug("Homematic CCU background discovery scan in progress");
  62         }
  63     }
  64
  65     @Override
  66     protected void stopScan() {
  67         if (scanFuture != null) {
  68             scanFuture.cancel(false);
  69             scanFuture = null;
  70         }
  71     }
  72
  73     @Override
  74     protected void startBackgroundDiscovery() {
  75         // only start once at startup
  76         startScan();
  77     }
  78
  79     @Override
  80     protected void stopBackgroundDiscovery() {
  81         stopScan();
  82     }
  83
  84     private synchronized void startDiscovery() {
  85         try {
  86             logger.debug("Starting Homematic CCU discovery scan");
  87             String configuredBroadcastAddress = networkAddressService.getConfiguredBroadcastAddress();
  88             if (configuredBroadcastAddress != null) {
  89                 broadcastAddress = InetAddress.getByName(configuredBroadcastAddress);
  90             }
  91             if (broadcastAddress == null) {
  92                 logger.warn("Homematic CCU discovery: discovery not possible, no broadcast address found");
  93                 return;
  94             }
  95             socket = new MulticastSocket();
  96             socket.setBroadcast(true);
  97             socket.setTimeToLive(5);
  98             socket.setSoTimeout(800);
  99
 100             sendBroadcast();
 101             receiveResponses();
 102         } catch (Exception ex) {
 103             logger.error("An error was thrown while running Homematic CCU discovery {}", ex.getMessage(), ex);
 104         } finally {
 105             scanFuture = null;
 106         }
 107     }
 108
 109     /**
 110      * Sends a UDP hello broadcast message for CCU gateways.
 111      */
 112     private void sendBroadcast() throws IOException {
 113         Eq3UdpRequest hello = new Eq3UdpRequest();
 114         byte[] data = hello.getBytes();
 115         DatagramPacket packet = new DatagramPacket(data, data.length, broadcastAddress, 43439);
 116         socket.send(packet);
 117     }
 118
 119     /**
 120      * Receives the UDP responses to the hello messages.
 121      */
 122     private void receiveResponses() throws IOException {
 123         long startTime = System.currentTimeMillis();
 124         long currentTime = System.currentTimeMillis();
 125         while (currentTime - startTime < RECEIVE_TIMEOUT_MSECS) {
 126             extractGatewayInfos();
 127             currentTime = System.currentTimeMillis();
 128         }
 129         socket.close();
 130     }
 131
 132     /**
 133      * Extracts the CCU infos from the UDP response.
 134      */
 135     private void extractGatewayInfos() throws IOException {
 136         try {
 137             DatagramPacket packet = new DatagramPacket(new byte[265], 256);
 138             socket.receive(packet);
 139
 140             Eq3UdpResponse response = new Eq3UdpResponse(packet.getData());
 141             logger.trace("Eq3UdpResponse: {}", response);
 142             if (response.isValid()) {
 143                 logger.debug("Discovered a CCU gateway with serial number '{}'", response.getSerialNumber());
 144
 145                 String address = packet.getAddress().getHostAddress();
 146                 ThingUID thingUid = new ThingUID(THING_TYPE_BRIDGE, response.getSerialNumber());
 147                 thingDiscovered(DiscoveryResultBuilder.create(thingUid).withProperty("gatewayAddress", address)
 148                         .withRepresentationProperty("gatewayAddress")
 149                         .withLabel(response.getDeviceTypeId() + " - " + address).build());
 150             }
 151         } catch (SocketTimeoutException ex) {
 152             // ignore
 153         }
 154     }
 155
 156     @Reference
 157     protected void setNetworkAddressService(NetworkAddressService networkAddressService) {
 158         this.networkAddressService = networkAddressService;
 159     }
 160
 161     protected void unsetNetworkAddressService(NetworkAddressService networkAddressService) {
 162         this.networkAddressService = null;
 163     }
 164 }