git.basschouten.com Git - openhab-addons.git/blob

   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.wifiled.internal.discovery;
  14
  15 import static org.openhab.binding.wifiled.internal.WiFiLEDBindingConstants.*;
  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.SocketTimeoutException;
  22 import java.util.HashMap;
  23 import java.util.Map;
  24 import java.util.Set;
  25 import java.util.concurrent.TimeUnit;
  26
  27 import org.openhab.binding.wifiled.internal.handler.AbstractWiFiLEDDriver;
  28 import org.openhab.binding.wifiled.internal.handler.ClassicWiFiLEDDriver;
  29 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  30 import org.openhab.core.config.discovery.DiscoveryResult;
  31 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  32 import org.openhab.core.config.discovery.DiscoveryService;
  33 import org.openhab.core.thing.ThingTypeUID;
  34 import org.openhab.core.thing.ThingUID;
  35 import org.osgi.service.component.annotations.Component;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 /**
  40  * The {@link WiFiLEDDiscoveryService} class implements a service
  41  * for discovering supported WiFi LED Devices.
  42  *
  43  * @author Osman Basha - Initial contribution
  44  */
  45 @Component(service = DiscoveryService.class, configurationPid = "discovery.wifiled")
  46 public class WiFiLEDDiscoveryService extends AbstractDiscoveryService {
  47
  48     private static final int DEFAULT_BROADCAST_PORT = 48899;
  49     private static final String DISCOVER_MESSAGE = "HF-A11ASSISTHREAD";
  50     private Logger logger = LoggerFactory.getLogger(WiFiLEDDiscoveryService.class);
  51
  52     public WiFiLEDDiscoveryService() {
  53         super(SUPPORTED_THING_TYPES_UIDS, 15, true);
  54     }
  55
  56     @Override
  57     public Set<ThingTypeUID> getSupportedThingTypes() {
  58         return SUPPORTED_THING_TYPES_UIDS;
  59     }
  60
  61     @Override
  62     protected void startBackgroundDiscovery() {
  63         logger.debug("Start WiFi LED background discovery");
  64         scheduler.schedule(() -> discover(), 0, TimeUnit.SECONDS);
  65     }
  66
  67     @Override
  68     public void startScan() {
  69         logger.debug("Start WiFi LED scan");
  70         discover();
  71     }
  72
  73     private synchronized void discover() {
  74         logger.debug("Try to discover all WiFi LED devices");
  75
  76         try (DatagramSocket socket = new DatagramSocket(DEFAULT_BROADCAST_PORT)) {
  77             socket.setBroadcast(true);
  78             socket.setSoTimeout(5000);
  79
  80             InetAddress inetAddress = InetAddress.getByName("255.255.255.255");
  81
  82             // send discover
  83             byte[] discover = DISCOVER_MESSAGE.getBytes();
  84             DatagramPacket packet = new DatagramPacket(discover, discover.length, inetAddress, DEFAULT_BROADCAST_PORT);
  85             socket.send(packet);
  86             logger.debug("Discover message sent: '{}'", DISCOVER_MESSAGE);
  87
  88             // wait for responses
  89             while (true) {
  90                 byte[] rxbuf = new byte[256];
  91                 packet = new DatagramPacket(rxbuf, rxbuf.length);
  92                 try {
  93                     socket.receive(packet);
  94                 } catch (SocketTimeoutException e) {
  95                     logger.trace("Timeout exceeded. Discovery process ended.");
  96                     break;
  97                 }
  98
  99                 byte[] data = packet.getData();
 100                 String s = bytesToString(data);
 101                 logger.debug("Discovery response received: '{}' [{}] ", s, ClassicWiFiLEDDriver.bytesToHex(data));
 102
 103                 // 192.168.178.25,ACCF23489C9A,HF-LPB100-ZJ200
 104                 // ^-IP..........,^-MAC.......,^-HOSTNAME.....
 105
 106                 String[] ss = s.split(",");
 107                 if (ss.length < 3) {
 108                     logger.debug("Ignoring unparseable discovery response: '{}'", s);
 109                     continue;
 110                 }
 111
 112                 String ip = ss[0];
 113                 String mac = ss[1];
 114                 String name = ss[2];
 115                 logger.debug("Adding a new WiFi LED with IP '{}' and MAC '{}' to inbox", ip, mac);
 116                 Map<String, Object> properties = new HashMap<>();
 117                 properties.put("ip", ip);
 118                 properties.put("protocol", AbstractWiFiLEDDriver.Protocol.LD382A);
 119                 ThingUID uid = new ThingUID(THING_TYPE_WIFILED, mac);
 120
 121                 DiscoveryResult result = DiscoveryResultBuilder.create(uid).withProperties(properties).withLabel(name)
 122                         .build();
 123                 thingDiscovered(result);
 124                 logger.debug("Thing discovered '{}'", result);
 125             }
 126         } catch (IOException e) {
 127             logger.debug("Device discovery encountered an I/O Exception: {}", e.getMessage(), e);
 128         }
 129     }
 130
 131     private static String bytesToString(byte[] bytes) {
 132         StringBuilder sb = new StringBuilder();
 133         for (byte aByte : bytes) {
 134             if (aByte == 0) {
 135                 break;
 136             }
 137             sb.append((char) (aByte & 0xFF));
 138         }
 139
 140         return sb.toString();
 141     }
 142 }