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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.radiothermostat.internal.discovery;
  14
  15 import java.io.IOException;
  16 import java.net.DatagramPacket;
  17 import java.net.Inet4Address;
  18 import java.net.InetAddress;
  19 import java.net.MalformedURLException;
  20 import java.net.MulticastSocket;
  21 import java.net.NetworkInterface;
  22 import java.net.SocketException;
  23 import java.net.SocketTimeoutException;
  24 import java.net.URL;
  25 import java.net.UnknownHostException;
  26 import java.nio.charset.StandardCharsets;
  27 import java.util.Enumeration;
  28 import java.util.Scanner;
  29 import java.util.concurrent.ScheduledFuture;
  30 import java.util.concurrent.TimeUnit;
  31
  32 import org.eclipse.jdt.annotation.NonNullByDefault;
  33 import org.eclipse.jdt.annotation.Nullable;
  34 import org.openhab.binding.radiothermostat.internal.RadioThermostatBindingConstants;
  35 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  36 import org.openhab.core.config.discovery.DiscoveryResult;
  37 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  38 import org.openhab.core.config.discovery.DiscoveryService;
  39 import org.openhab.core.io.net.http.HttpUtil;
  40 import org.openhab.core.thing.ThingUID;
  41 import org.osgi.service.component.annotations.Component;
  42 import org.slf4j.Logger;
  43 import org.slf4j.LoggerFactory;
  44
  45 import com.google.gson.JsonObject;
  46 import com.google.gson.JsonParser;
  47 import com.google.gson.JsonSyntaxException;
  48
  49 /**
  50  * The {@link RadioThermostatDiscoveryService} is responsible for discovery of
  51  * RadioThermostats on the local network
  52  *
  53  * @author William Welliver - Initial contribution
  54  * @author Dan Cunningham - Refactoring and Improvements
  55  * @author Bill Forsyth - Modified for the RadioThermostat's peculiar discovery mode
  56  * @author Michael Lobstein - Cleanup for RadioThermostat
  57  *
  58  */
  59 @NonNullByDefault
  60 @Component(service = DiscoveryService.class, configurationPid = "discovery.radiothermostat")
  61 public class RadioThermostatDiscoveryService extends AbstractDiscoveryService {
  62     private final Logger logger = LoggerFactory.getLogger(RadioThermostatDiscoveryService.class);
  63     private static final String RADIOTHERMOSTAT_DISCOVERY_MESSAGE = "TYPE: WM-DISCOVER\r\nVERSION: 1.0\r\n\r\nservices:com.marvell.wm.system*\r\n\r\n";
  64
  65     private static final String SSDP_MATCH = "WM-NOTIFY";
  66     private static final int BACKGROUND_SCAN_INTERVAL_SECONDS = 300;
  67
  68     private @Nullable ScheduledFuture<?> scheduledFuture = null;
  69
  70     public RadioThermostatDiscoveryService() {
  71         super(RadioThermostatBindingConstants.SUPPORTED_THING_TYPES_UIDS, 30, true);
  72     }
  73
  74     @Override
  75     protected void startBackgroundDiscovery() {
  76         logger.debug("Starting Background Scan");
  77         stopBackgroundDiscovery();
  78         scheduledFuture = scheduler.scheduleWithFixedDelay(this::doRunRun, 0, BACKGROUND_SCAN_INTERVAL_SECONDS,
  79                 TimeUnit.SECONDS);
  80     }
  81
  82     @Override
  83     protected void stopBackgroundDiscovery() {
  84         ScheduledFuture<?> scheduledFuture = this.scheduledFuture;
  85         if (scheduledFuture != null) {
  86             scheduledFuture.cancel(true);
  87             this.scheduledFuture = null;
  88         }
  89     }
  90
  91     @Override
  92     protected void startScan() {
  93         logger.debug("Starting Interactive Scan");
  94         doRunRun();
  95     }
  96
  97     protected synchronized void doRunRun() {
  98         logger.debug("Sending SSDP discover.");
  99         try {
 100             Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
 101             while (nets.hasMoreElements()) {
 102                 NetworkInterface ni = nets.nextElement();
 103                 if (ni.isUp() && ni.supportsMulticast() && !ni.isLoopback()) {
 104                     sendDiscoveryBroacast(ni);
 105                 }
 106             }
 107         } catch (IOException e) {
 108             logger.debug("Error discovering devices", e);
 109         }
 110     }
 111
 112     /**
 113      * Broadcasts a SSDP discovery message into the network to find provided
 114      * services.
 115      *
 116      * @return The Socket the answers will arrive at.
 117      * @throws UnknownHostException
 118      * @throws IOException
 119      * @throws SocketException
 120      */
 121     private void sendDiscoveryBroacast(NetworkInterface ni) throws UnknownHostException, SocketException {
 122         InetAddress m = InetAddress.getByName("239.255.255.250");
 123         final int port = 1900;
 124         logger.debug("Sending discovery broadcast");
 125         try {
 126             Enumeration<InetAddress> addrs = ni.getInetAddresses();
 127             InetAddress a = null;
 128             while (addrs.hasMoreElements()) {
 129                 a = addrs.nextElement();
 130                 if (a instanceof Inet4Address) {
 131                     break;
 132                 } else {
 133                     a = null;
 134                 }
 135             }
 136             if (a == null) {
 137                 logger.debug("no ipv4 address on {}", ni.getName());
 138                 return;
 139             }
 140
 141             // for whatever reason, the radio thermostat responses will not be seen
 142             // if we bind this socket to a particular address.
 143             // this seems to be okay on linux systems, but osx apparently prefers ipv6, so this
 144             // prevents responses from being received unless the ipv4 stack is given preference.
 145             MulticastSocket socket = new MulticastSocket(null);
 146             socket.setSoTimeout(5000);
 147             socket.setReuseAddress(true);
 148             // socket.setBroadcast(true);
 149             socket.setNetworkInterface(ni);
 150             socket.joinGroup(m);
 151             logger.debug("Joined UPnP Multicast group on Interface: {}", ni.getName());
 152             byte[] requestMessage = RADIOTHERMOSTAT_DISCOVERY_MESSAGE.getBytes(StandardCharsets.UTF_8);
 153             DatagramPacket datagramPacket = new DatagramPacket(requestMessage, requestMessage.length, m, port);
 154             socket.send(datagramPacket);
 155             try {
 156                 // Try to ensure that joinGroup has taken effect. Without this delay, the query
 157                 // packet ends up going out before the group join.
 158                 Thread.sleep(1000);
 159
 160                 socket.send(datagramPacket);
 161
 162                 byte[] buf = new byte[4096];
 163                 DatagramPacket packet = new DatagramPacket(buf, buf.length);
 164
 165                 try {
 166                     while (!Thread.interrupted()) {
 167                         socket.receive(packet);
 168                         String response = new String(packet.getData(), StandardCharsets.UTF_8);
 169                         logger.debug("Response: {} ", response);
 170                         if (response.contains(SSDP_MATCH)) {
 171                             logger.debug("Match: {} ", response);
 172                             parseResponse(response);
 173                         }
 174                     }
 175                     logger.debug("Bridge device scan interrupted");
 176                 } catch (SocketTimeoutException e) {
 177                     logger.debug(
 178                             "Timed out waiting for multicast response. Presumably all devices have already responded.");
 179                 }
 180             } finally {
 181                 socket.leaveGroup(m);
 182                 socket.close();
 183             }
 184         } catch (IOException | InterruptedException e) {
 185             logger.debug("got exception: {}", e.getMessage());
 186         }
 187         return;
 188     }
 189
 190     /**
 191      * Scans all messages that arrive on the socket and scans them for the
 192      * search keywords. The search is not case sensitive.
 193      *
 194      * @param response
 195      */
 196
 197     protected void parseResponse(String response) {
 198         DiscoveryResult result;
 199
 200         String name = "unknownName";
 201         String uuid = "unknownThermostat";
 202         String ip = null;
 203         String url = null;
 204
 205         Scanner scanner = new Scanner(response);
 206         while (scanner.hasNextLine()) {
 207             String line = scanner.nextLine();
 208             String[] pair = line.split(":", 2);
 209             if (pair.length != 2) {
 210                 continue;
 211             }
 212             String key = pair[0].toLowerCase();
 213             String value = pair[1].trim();
 214             logger.debug("key: {} value: {}.", key, value);
 215             if ("location".equals(key)) {
 216                 try {
 217                     url = value;
 218                     ip = new URL(value).getHost();
 219                 } catch (MalformedURLException e) {
 220                     logger.debug("Malfored URL {}", e.getMessage());
 221                 }
 222             }
 223         }
 224         scanner.close();
 225
 226         logger.debug("Found thermostat, ip: {} ", ip);
 227
 228         if (ip == null) {
 229             logger.debug("Bad Format from thermostat");
 230             return;
 231         }
 232
 233         JsonObject content;
 234         String sysinfo;
 235         boolean isCT80 = false;
 236
 237         try {
 238             // Run the HTTP request and get the JSON response from the thermostat
 239             sysinfo = HttpUtil.executeUrl("GET", url, 20000);
 240             content = JsonParser.parseString(sysinfo).getAsJsonObject();
 241             uuid = content.get("uuid").getAsString();
 242         } catch (IOException | JsonSyntaxException e) {
 243             logger.debug("Cannot get system info from thermostat {} {}", ip, e.getMessage());
 244             sysinfo = null;
 245         }
 246
 247         try {
 248             String nameinfo = HttpUtil.executeUrl("GET", url + "name", 20000);
 249             content = JsonParser.parseString(nameinfo).getAsJsonObject();
 250             name = content.get("name").getAsString();
 251         } catch (IOException | JsonSyntaxException e) {
 252             logger.debug("Cannot get name from thermostat {} {}", ip, e.getMessage());
 253         }
 254
 255         try {
 256             String model = HttpUtil.executeUrl("GET", "http://" + ip + "/tstat/model", 20000);
 257             isCT80 = (model != null && model.contains("CT80")) ? true : false;
 258         } catch (IOException | JsonSyntaxException e) {
 259             logger.debug("Cannot get model information from thermostat {} {}", ip, e.getMessage());
 260         }
 261
 262         logger.debug("Discovery returned: {} uuid {} name {}", sysinfo, uuid, name);
 263
 264         ThingUID thingUid = new ThingUID(RadioThermostatBindingConstants.THING_TYPE_RTHERM, uuid);
 265
 266         logger.debug("Got discovered device.");
 267
 268         String label = String.format("RadioThermostat (%s)", name);
 269         result = DiscoveryResultBuilder.create(thingUid).withLabel(label)
 270                 .withRepresentationProperty(RadioThermostatBindingConstants.PROPERTY_IP)
 271                 .withProperty(RadioThermostatBindingConstants.PROPERTY_IP, ip)
 272                 .withProperty(RadioThermostatBindingConstants.PROPERTY_ISCT80, isCT80).build();
 273         logger.debug("New RadioThermostat discovered with ID=<{}>", uuid);
 274         this.thingDiscovered(result);
 275     }
 276 }