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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.max.internal.discovery;
  14
  15 import static org.openhab.binding.max.internal.MaxBindingConstants.*;
  16 import static org.openhab.core.thing.Thing.PROPERTY_SERIAL_NUMBER;
  17
  18 import java.io.IOException;
  19 import java.net.DatagramPacket;
  20 import java.net.DatagramSocket;
  21 import java.net.InetAddress;
  22 import java.net.InterfaceAddress;
  23 import java.net.NetworkInterface;
  24 import java.net.SocketTimeoutException;
  25 import java.nio.charset.StandardCharsets;
  26 import java.util.Arrays;
  27 import java.util.Enumeration;
  28 import java.util.HashMap;
  29 import java.util.Map;
  30 import java.util.Set;
  31 import java.util.concurrent.ScheduledFuture;
  32 import java.util.concurrent.TimeUnit;
  33
  34 import org.openhab.binding.max.internal.Utils;
  35 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  36 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  37 import org.openhab.core.config.discovery.DiscoveryService;
  38 import org.openhab.core.thing.ThingTypeUID;
  39 import org.openhab.core.thing.ThingUID;
  40 import org.osgi.service.component.annotations.Component;
  41 import org.slf4j.Logger;
  42 import org.slf4j.LoggerFactory;
  43
  44 /**
  45  * The {@link MaxCubeBridgeDiscovery} is responsible for discovering new MAX!
  46  * Cube LAN gateway devices on the network
  47  *
  48  * @author Marcel Verpaalen - Initial contribution
  49  */
  50 @Component(service = DiscoveryService.class, configurationPid = "discovery.max")
  51 public class MaxCubeBridgeDiscovery extends AbstractDiscoveryService {
  52
  53     private static final String MAXCUBE_DISCOVER_STRING = "eQ3Max*\0**********I";
  54     private static final int SEARCH_TIME = 15;
  55
  56     private final Logger logger = LoggerFactory.getLogger(MaxCubeBridgeDiscovery.class);
  57
  58     protected static boolean discoveryRunning;
  59
  60     /** The refresh interval for discovery of MAX! Cubes */
  61     private static final long SEARCH_INTERVAL = 600;
  62     private ScheduledFuture<?> cubeDiscoveryJob;
  63
  64     public MaxCubeBridgeDiscovery() {
  65         super(SEARCH_TIME);
  66     }
  67
  68     @Override
  69     public Set<ThingTypeUID> getSupportedThingTypes() {
  70         return SUPPORTED_BRIDGE_THING_TYPES_UIDS;
  71     }
  72
  73     @Override
  74     public void startScan() {
  75         logger.debug("Start MAX! Cube discovery");
  76         discoverCube();
  77     }
  78
  79     @Override
  80     protected void stopBackgroundDiscovery() {
  81         logger.debug("Stop MAX! Cube background discovery");
  82         if (cubeDiscoveryJob != null && !cubeDiscoveryJob.isCancelled()) {
  83             cubeDiscoveryJob.cancel(true);
  84             cubeDiscoveryJob = null;
  85         }
  86     }
  87
  88     @Override
  89     protected void startBackgroundDiscovery() {
  90         logger.debug("Start MAX! Cube background discovery");
  91         if (cubeDiscoveryJob == null || cubeDiscoveryJob.isCancelled()) {
  92             cubeDiscoveryJob = scheduler.scheduleWithFixedDelay(this::discoverCube, 0, SEARCH_INTERVAL,
  93                     TimeUnit.SECONDS);
  94         }
  95     }
  96
  97     private synchronized void discoverCube() {
  98         logger.debug("Run MAX! Cube discovery");
  99         sendDiscoveryMessage(MAXCUBE_DISCOVER_STRING);
 100         logger.trace("Done sending broadcast discovery messages.");
 101         receiveDiscoveryMessage();
 102         logger.debug("Done receiving discovery messages.");
 103     }
 104
 105     private void receiveDiscoveryMessage() {
 106         try (final DatagramSocket bcReceipt = new DatagramSocket(23272)) {
 107             discoveryRunning = true;
 108             bcReceipt.setReuseAddress(true);
 109             bcReceipt.setSoTimeout(5000);
 110
 111             while (discoveryRunning) {
 112                 // Wait for a response
 113                 final byte[] recvBuf = new byte[1500];
 114                 final DatagramPacket receivePacket = new DatagramPacket(recvBuf, recvBuf.length);
 115                 bcReceipt.receive(receivePacket);
 116
 117                 // We have a response
 118                 final byte[] messageBuf = Arrays.copyOfRange(receivePacket.getData(), receivePacket.getOffset(),
 119                         receivePacket.getOffset() + receivePacket.getLength());
 120                 final String message = new String(messageBuf, StandardCharsets.UTF_8);
 121                 logger.trace("Broadcast response from {} : {} '{}'", receivePacket.getAddress(), message.length(),
 122                         message);
 123
 124                 // Check if the message is correct
 125                 if (message.startsWith("eQ3Max") && !message.equals(MAXCUBE_DISCOVER_STRING)) {
 126                     String maxCubeIP = receivePacket.getAddress().getHostAddress();
 127                     String maxCubeState = message.substring(0, 8);
 128                     String serialNumber = message.substring(8, 18);
 129                     String msgValidid = message.substring(18, 19);
 130                     String requestType = message.substring(19, 20);
 131                     String rfAddress = "";
 132                     logger.debug("MAX! Cube found on network");
 133                     logger.debug("Found at  : {}", maxCubeIP);
 134                     logger.trace("Cube State: {}", maxCubeState);
 135                     logger.debug("Serial    : {}", serialNumber);
 136                     logger.trace("Msg Valid : {}", msgValidid);
 137                     logger.trace("Msg Type  : {}", requestType);
 138
 139                     if (requestType.equals("I")) {
 140                         rfAddress = Utils.getHex(Arrays.copyOfRange(messageBuf, 21, 24)).replace(" ", "").toLowerCase();
 141                         String firmwareVersion = Utils.getHex(Arrays.copyOfRange(messageBuf, 24, 26)).replace(" ", ".");
 142                         logger.debug("RF Address: {}", rfAddress);
 143                         logger.debug("Firmware  : {}", firmwareVersion);
 144                     }
 145                     discoveryResultSubmission(maxCubeIP, serialNumber, rfAddress);
 146                 }
 147             }
 148         } catch (SocketTimeoutException e) {
 149             logger.trace("No further response");
 150             discoveryRunning = false;
 151         } catch (IOException e) {
 152             logger.debug("IO error during MAX! Cube discovery: {}", e.getMessage());
 153             discoveryRunning = false;
 154         }
 155     }
 156
 157     private void discoveryResultSubmission(String IpAddress, String cubeSerialNumber, String rfAddress) {
 158         if (cubeSerialNumber != null) {
 159             logger.trace("Adding new MAX! Cube Lan Gateway on {} with id '{}' to Smarthome inbox", IpAddress,
 160                     cubeSerialNumber);
 161             Map<String, Object> properties = new HashMap<>(2);
 162             properties.put(PROPERTY_IP_ADDRESS, IpAddress);
 163             properties.put(PROPERTY_SERIAL_NUMBER, cubeSerialNumber);
 164             properties.put(PROPERTY_RFADDRESS, rfAddress);
 165             ThingUID uid = new ThingUID(CUBEBRIDGE_THING_TYPE, cubeSerialNumber);
 166             thingDiscovered(DiscoveryResultBuilder.create(uid).withProperties(properties)
 167                     .withRepresentationProperty(PROPERTY_SERIAL_NUMBER).withThingType(CUBEBRIDGE_THING_TYPE)
 168                     .withLabel("MAX! Cube LAN Gateway").build());
 169         }
 170     }
 171
 172     /**
 173      * Send broadcast message over all active interfaces
 174      *
 175      * @param discoverString
 176      *            String to be used for the discovery
 177      */
 178     private void sendDiscoveryMessage(String discoverString) {
 179         // Find the MaxCube using UDP broadcast
 180         try (DatagramSocket bcSend = new DatagramSocket()) {
 181             bcSend.setBroadcast(true);
 182
 183             byte[] sendData = discoverString.getBytes(StandardCharsets.UTF_8);
 184
 185             // Broadcast the message over all the network interfaces
 186             Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
 187             while (interfaces.hasMoreElements()) {
 188                 NetworkInterface networkInterface = interfaces.nextElement();
 189                 if (networkInterface.isLoopback() || !networkInterface.isUp()) {
 190                     continue;
 191                 }
 192                 for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses()) {
 193                     InetAddress[] broadcast = new InetAddress[3];
 194                     broadcast[0] = InetAddress.getByName("224.0.0.1");
 195                     broadcast[1] = InetAddress.getByName("255.255.255.255");
 196                     broadcast[2] = interfaceAddress.getBroadcast();
 197                     for (InetAddress bc : broadcast) {
 198                         // Send the broadcast package!
 199                         if (bc != null) {
 200                             try {
 201                                 DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, bc, 23272);
 202                                 bcSend.send(sendPacket);
 203                             } catch (IOException e) {
 204                                 logger.debug("IO error during MAX! Cube discovery: {}", e.getMessage());
 205                             } catch (Exception e) {
 206                                 logger.debug("{}", e.getMessage(), e);
 207                             }
 208                             logger.trace("Request packet sent to: {} Interface: {}", bc.getHostAddress(),
 209                                     networkInterface.getDisplayName());
 210                         }
 211                     }
 212                 }
 213             }
 214             logger.trace("Done looping over all network interfaces. Now waiting for a reply!");
 215
 216         } catch (IOException e) {
 217             logger.debug("IO error during MAX! Cube discovery: {}", e.getMessage());
 218         }
 219     }
 220 }