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   1 /**
   2  * Copyright (c) 2010-2022 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.ventaair.internal.discovery;
  14
  15 import java.io.IOException;
  16 import java.net.DatagramPacket;
  17 import java.net.DatagramSocket;
  18 import java.net.SocketException;
  19 import java.nio.charset.StandardCharsets;
  20 import java.time.Duration;
  21 import java.util.Collections;
  22 import java.util.HashMap;
  23 import java.util.Set;
  24 import java.util.concurrent.ScheduledFuture;
  25 import java.util.concurrent.TimeUnit;
  26
  27 import org.eclipse.jdt.annotation.NonNullByDefault;
  28 import org.eclipse.jdt.annotation.Nullable;
  29 import org.openhab.binding.ventaair.internal.VentaAirBindingConstants;
  30 import org.openhab.binding.ventaair.internal.message.dto.Header;
  31 import org.openhab.binding.ventaair.internal.message.dto.Message;
  32 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  33 import org.openhab.core.config.discovery.DiscoveryResult;
  34 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  35 import org.openhab.core.config.discovery.DiscoveryService;
  36 import org.openhab.core.thing.ThingTypeUID;
  37 import org.openhab.core.thing.ThingUID;
  38 import org.openhab.core.util.HexUtils;
  39 import org.osgi.service.component.annotations.Component;
  40 import org.slf4j.Logger;
  41 import org.slf4j.LoggerFactory;
  42
  43 import com.google.gson.Gson;
  44 import com.google.gson.JsonSyntaxException;
  45
  46 /**
  47  * Discovers Venta Air humidifier and cleaner devices by listening for UDP messages
  48  *
  49  * @author Stefan Triller - Initial contribution
  50  *
  51  */
  52 @NonNullByDefault
  53 @Component(service = DiscoveryService.class, configurationPid = "discovery.ventaair")
  54 public class VentaDeviceDiscovery extends AbstractDiscoveryService {
  55     private static final String REPRESENTATION_PROPERTY = "macAddress";
  56     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections
  57             .singleton(VentaAirBindingConstants.THING_TYPE_LW60T);
  58     // defined as int, because AbstractDiscoveryService wants and int and not long as provided by Duration.getSeconds()
  59     private static final int MANUAL_DISCOVERY_TIME = 30;
  60     private static final Duration TIME_BETWEEN_SCANS = Duration.ofSeconds(30);
  61
  62     private final Logger logger = LoggerFactory.getLogger(VentaDeviceDiscovery.class);
  63
  64     private @Nullable ScheduledFuture<?> scanJob = null;
  65
  66     public VentaDeviceDiscovery() {
  67         super(SUPPORTED_THING_TYPES_UIDS, MANUAL_DISCOVERY_TIME, true);
  68     }
  69
  70     @Override
  71     protected void startScan() {
  72         findDevices();
  73     }
  74
  75     @Override
  76     protected void startBackgroundDiscovery() {
  77         super.startBackgroundDiscovery();
  78
  79         ScheduledFuture<?> localScanJob = scanJob;
  80         if (localScanJob != null) {
  81             localScanJob.cancel(true);
  82         }
  83
  84         scanJob = scheduler.scheduleWithFixedDelay(this::findDevices, 5, TIME_BETWEEN_SCANS.getSeconds(),
  85                 TimeUnit.SECONDS);
  86     }
  87
  88     @Override
  89     protected void stopBackgroundDiscovery() {
  90         super.stopBackgroundDiscovery();
  91
  92         ScheduledFuture<?> localScanJob = scanJob;
  93         if (localScanJob != null) {
  94             localScanJob.cancel(true);
  95         }
  96         scanJob = null;
  97     }
  98
  99     private void findDevices() {
 100         byte[] buf = new byte[512];
 101         try (DatagramSocket socket = new DatagramSocket(VentaAirBindingConstants.PORT)) {
 102             DatagramPacket packet = new DatagramPacket(buf, buf.length);
 103             socket.receive(packet);
 104
 105             Message m = parseDiscoveryPaket(packet.getData());
 106             if (m == null) {
 107                 logger.debug("Received broken discovery packet data={}", HexUtils.bytesToHex(packet.getData(), ", "));
 108                 return;
 109             }
 110
 111             logger.debug("Found device with: IP={} Mac={} and device type={}", m.getHeader().getIpAdress(),
 112                     m.getHeader().getMacAdress(), m.getHeader().getDeviceType());
 113
 114             ThingTypeUID thingTypeUID;
 115             switch (m.getHeader().getDeviceType()) {
 116                 case 4:
 117                     thingTypeUID = VentaAirBindingConstants.THING_TYPE_LW60T;
 118                     break;
 119                 default:
 120                     thingTypeUID = VentaAirBindingConstants.THING_TYPE_GENERIC;
 121                     break;
 122             }
 123             createDiscoveryResult(thingTypeUID, m.getHeader());
 124         } catch (SocketException e) {
 125             logger.warn("Could not open port {} to scan for Venta devices in the network.",
 126                     VentaAirBindingConstants.PORT);
 127         } catch (IOException e) {
 128             // swallow, since we already log the broken packet above
 129         }
 130     }
 131
 132     private @Nullable Message parseDiscoveryPaket(byte[] packet) {
 133         Gson gson = new Gson();
 134         Message msg = null;
 135
 136         String packetAsString = new String(packet, StandardCharsets.UTF_8);
 137
 138         String[] lines = packetAsString.split("\n");
 139         if (lines.length >= 3) {
 140             String input = lines[2];
 141             int end = input.lastIndexOf("}"); // strip padding bytes added by the device
 142             if (end > 0) {
 143                 String rawJSONstring = input.substring(0, end + 1);
 144                 try {
 145                     msg = gson.fromJson(rawJSONstring, Message.class);
 146                 } catch (JsonSyntaxException e) {
 147                     logger.debug("Received invalid JSON data={}", rawJSONstring, e);
 148                 }
 149             }
 150         }
 151         return msg;
 152     }
 153
 154     private void createDiscoveryResult(ThingTypeUID thingTypeUID, Header messageHeader) {
 155         String ipAddress = messageHeader.getIpAdress();
 156         String macAddress = messageHeader.getMacAdress();
 157         int deviceType = messageHeader.getDeviceType();
 158
 159         ThingUID uid = new ThingUID(thingTypeUID, ipAddress.replace(".", "_"));
 160         HashMap<String, Object> properties = new HashMap<>();
 161         properties.put("ipAddress", ipAddress);
 162         properties.put(REPRESENTATION_PROPERTY, macAddress);
 163         properties.put("deviceType", deviceType);
 164
 165         String typeLabel = thingTypeUID.getId().toUpperCase();
 166
 167         DiscoveryResult result = DiscoveryResultBuilder.create(uid).withRepresentationProperty(REPRESENTATION_PROPERTY)
 168                 .withProperties(properties).withLabel(typeLabel + " (IP=" + ipAddress + ")").build();
 169
 170         this.thingDiscovered(result);
 171     }
 172 }