stabilize nanoleaf binding:suppress ipv6 addresses in controller disc…

…overy

Signed-off-by: Stefan Höhn <[email protected]>

bundles/org.openhab.binding.nanoleaf/src/main/java/org/openhab/binding/nanoleaf/internal/discovery/NanoleafMDNSDiscoveryParticipant.java

@@ -14,6 +14,8 @@
 
 import static org.openhab.binding.nanoleaf.internal.NanoleafBindingConstants.*;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
@@ -66,6 +68,15 @@ public String getServiceType() {
         }
         final Map<String, Object> properties = new HashMap<>(2);
         String host = service.getHostAddresses()[0];
+        try {
+            if (InetAddress.getByName(host).getAddress().length != 4) {
+                logger.info("Ignoring IPv6 address for nanoleaf controllers: {}", host);
+                return null;
+            }
+        } catch (UnknownHostException e) {
+            logger.error("Error while checking IP address for nanoleaf controller: {}", host);
+            return null;
+        }
         properties.put(CONFIG_ADDRESS, host);
         int port = service.getPort();
         properties.put(CONFIG_PORT, port);