refactor: Updated the discovery example to not list every device for …

…every local device that could reach it.

plc4j/drivers/profinet-ng/src/test/java/org/apache/plc4x/java/profinet/ManualProfinetIoDiscoveryTest.java

@@ -23,12 +23,22 @@
 import org.apache.plc4x.java.api.messages.PlcDiscoveryItem;
 import org.apache.plc4x.java.api.messages.PlcDiscoveryResponse;
 
+import java.util.Map;
+import java.util.TreeMap;
+
 public class ManualProfinetIoDiscoveryTest {
 
     public static void main(String[] args) throws Exception {
         final PlcDriver profinetDriver = new DefaultPlcDriverManager().getDriver("profinet");
         final PlcDiscoveryResponse plcDiscoveryResponse = profinetDriver.discoveryRequestBuilder().build().execute().get();
+        // As we can reach some devices from multiple network devices, aggregate them by connection url
+        Map<String, PlcDiscoveryItem> items = new TreeMap<>();
         for (PlcDiscoveryItem responseValue : plcDiscoveryResponse.getValues()) {
+            items.put(responseValue.getConnectionUrl(), responseValue);
+        }
+        // Output the aggregated values.
+        for (Map.Entry<String, PlcDiscoveryItem> stringPlcDiscoveryItemEntry : items.entrySet()) {
+            PlcDiscoveryItem responseValue = stringPlcDiscoveryItemEntry.getValue();
             System.out.println(responseValue.getName() + ":  " + responseValue.getConnectionUrl());
         }
     }