Fix Unnecessary Port Binding for ArtNet Sender

Modify the artnet4j library to avoid static binding its port when acting solely as a Sender. Instead, it should use an ephemeral port for sending data.

src/main/java/ch/bildspur/artnet/ArtNetClient.java

@@ -49,8 +49,7 @@ public ArtNetClient(ArtNetBuffer inputBuffer, int serverPort, int clientPort) {
      * Start client with default arguments (listen on broadcast).
      */
     public void start() {
-        // use default network interface
-        this.start((InetAddress)null);
+        this.start(null, inputBuffer != null);
     }
 
     /**
@@ -60,7 +59,7 @@ public void start() {
     public void start(String networkInterfaceAddress)
     {
         try {
-            this.start(InetAddress.getByName(networkInterfaceAddress));
+            this.start(InetAddress.getByName(networkInterfaceAddress), inputBuffer != null);
         } catch (UnknownHostException e) {
             e.printStackTrace();
         }
@@ -71,6 +70,15 @@ public void start(String networkInterfaceAddress)
      * @param networkInterfaceAddress Network interface address to listen to.
      */
     public void start(InetAddress networkInterfaceAddress) {
+        this.start(networkInterfaceAddress, inputBuffer != null);
+    }
+
+    /**
+     * Start client with specific network interface address and receiver mode.
+     * @param networkInterfaceAddress Network interface address to listen to.
+     * @param isReceiver If true, the client will bind to the specified port to receive data.
+     */
+    public void start(InetAddress networkInterfaceAddress, boolean isReceiver) {
         if (isRunning)
             return;
 
@@ -87,7 +95,7 @@ public void artNetPacketReceived(ArtNetPacket packet) {
                         }
                     });
 
-            server.start(networkInterfaceAddress);
+            server.start(networkInterfaceAddress, isReceiver);
 
             isRunning = true;
         } catch (SocketException | ArtNetException e) {