Fixed /discovery/list not returning available clients (#352)

Author: devgianlu

api/src/main/java/xyz/gianlu/librespot/api/handlers/DiscoveryHandler.java

@@ -21,22 +21,34 @@
 import io.undertow.server.HttpHandler;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.util.Headers;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import xyz.gianlu.librespot.ZeroconfServer;
 import xyz.gianlu.librespot.api.Utils;
 import xyz.gianlu.zeroconf.DiscoveredService;
 import xyz.gianlu.zeroconf.Zeroconf;
 
+import java.io.IOException;
 import java.util.Deque;
 import java.util.Map;
 
 /**
  * @author devgianlu
  */
 public final class DiscoveryHandler implements HttpHandler {
+    private static final Logger LOGGER = LoggerFactory.getLogger(DiscoveryHandler.class);
     private final Zeroconf zeroconf;
 
     public DiscoveryHandler() {
-        zeroconf = new Zeroconf();
+        zeroconf = new Zeroconf()
+                .setUseIpv4(true)
+                .setUseIpv6(false);
+
+        try {
+            zeroconf.addAllNetworkInterfaces();
+        } catch (IOException ex) {
+            LOGGER.error("Failed adding network interfaces for Zeroconf.", ex);
+        }
     }
 
     @Override

lib/pom.xml

@@ -116,7 +116,7 @@
         <dependency>
             <groupId>xyz.gianlu.zeroconf</groupId>
             <artifactId>zeroconf</artifactId>
-            <version>1.2.1</version>
+            <version>1.2.2</version>
         </dependency>
 
         <!-- HTTP -->