[tado] Add mDNS discovery (openhab#16861)

* [tado] Add mDNS discovery

Signed-off-by: Andrew Fiddian-Green <software@whitebear.ch>

bundles/org.openhab.binding.tado/README.md

@@ -7,8 +7,9 @@ You can then monitor and control all zone types (Heating, AC, Hot Water) as well
 
 ## `home` Thing (the Bridge)
 
-The binding supports discovery, but a `home` thing type has to be configured first.
-It serves as bridge to the tado° cloud services.
+The `home` thing serves as bridge to the tado° cloud services.
+The binding will automatically discover this thing and place it in the Inbox.
+It has to be manually configured with its `username` and `password` before it will actually go onlime.
 
 Parameter | Required | Description
 -|-|-
@@ -21,7 +22,7 @@ Example `tado.things`
 Bridge tado:home:demo [ username="mail@example.com", password="secret" ]
 ```
 
-Afterwards the discovery will show all zones and mobile devices associated with the user's home.
+Once the `home` thing is online, the binding will discover all its respective zones and mobile devices, and place them in the Inbox.
 
 ### Channels
 

bundles/org.openhab.binding.tado/src/main/java/org/openhab/binding/tado/internal/discovery/TadoDiscoveryParticipant.java

@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) 2010-2024 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.binding.tado.internal.discovery;
+
+import static org.openhab.binding.tado.internal.TadoBindingConstants.THING_TYPE_HOME;
+
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import javax.jmdns.ServiceInfo;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.eclipse.jdt.annotation.Nullable;
+import org.openhab.core.config.discovery.DiscoveryResult;
+import org.openhab.core.config.discovery.DiscoveryResultBuilder;
+import org.openhab.core.config.discovery.mdns.MDNSDiscoveryParticipant;
+import org.openhab.core.thing.ThingTypeUID;
+import org.openhab.core.thing.ThingUID;
+import org.osgi.service.component.annotations.Component;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Discovers Tado Internet Bridges by means of mDNS
+ *
+ * @author Andrew Fiddian-Green - Initial contribution
+ */
+@Component(configurationPid = "discovery.tado")
+@NonNullByDefault
+public class TadoDiscoveryParticipant implements MDNSDiscoveryParticipant {
+
+    private static final String SERVICE_TYPE = "_hap._tcp.local.";
+    private static final String TADO_INTERNET_BRIDGE = "tado Internet Bridge";
+    private static final String DISCOVERY_BRIDGE_LABEL_KEY = "discovery.bridge.label";
+
+    public static final Pattern VALID_IP_V4_ADDRESS = Pattern
+            .compile("\\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\\.|$)){4}\\b");
+
+    private final Logger logger = LoggerFactory.getLogger(TadoDiscoveryParticipant.class);
+
+    @Override
+    public Set<ThingTypeUID> getSupportedThingTypeUIDs() {
+        return Set.of(THING_TYPE_HOME);
+    }
+
+    @Override
+    public String getServiceType() {
+        return SERVICE_TYPE;
+    }
+
+    @Override
+    public @Nullable DiscoveryResult createResult(ServiceInfo service) {
+        ThingUID thingUID = getThingUID(service);
+        if (thingUID != null) {
+            String ipAddress = thingUID.getId().replace("_", ".");
+            DiscoveryResult hub = DiscoveryResultBuilder.create(thingUID)
+                    .withLabel(String.format("@text/%s [\"%s\"]", DISCOVERY_BRIDGE_LABEL_KEY, ipAddress)).build();
+            logger.debug("mDNS discovered tado° internet bridge '{}' on '{}'", thingUID, ipAddress);
+            return hub;
+        }
+        return null;
+    }
+
+    @Override
+    public @Nullable ThingUID getThingUID(ServiceInfo service) {
+        if (service.getName().startsWith(TADO_INTERNET_BRIDGE)) {
+            for (String host : service.getHostAddresses()) {
+                if (VALID_IP_V4_ADDRESS.matcher(host).matches()) {
+                    return new ThingUID(THING_TYPE_HOME, host.replace('.', '_'));
+                }
+            }
+        }
+        return null;
+    }
+}

bundles/org.openhab.binding.tado/src/main/resources/OH-INF/i18n/tado.properties

@@ -109,3 +109,7 @@ channel-type.tado.verticalSwing.state.option.MID_DOWN = MID-DOWN
 channel-type.tado.verticalSwing.state.option.DOWN = DOWN
 channel-type.tado.verticalSwing.state.option.ON = ON
 channel-type.tado.verticalSwing.state.option.OFF = OFF
+
+# discovery
+
+discovery.bridge.label = tado° Internet Bridge ({0})