Remove legacy UDP port support

src/org/kde/kdeconnect/Backends/LanBackend/LanLinkProvider.java

@@ -69,7 +69,6 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
     public static final int MIN_VERSION_WITH_SSL_SUPPORT = 6;
     private static final int MIN_VERSION_WITH_NEW_PORT_SUPPORT = 7;
 
-    private final static int MIN_PORT_LEGACY = 1714;
     private final static int MIN_PORT = 1716;
     private final static int MAX_PORT = 1764;
     final static int PAYLOAD_TRANSFER_MIN_PORT = 1739;
@@ -80,7 +79,6 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
 
     private ServerSocket tcpServer;
     private DatagramSocket udpServer;
-    private DatagramSocket udpServerOldPort;
 
     private boolean listening = false;
 
@@ -412,7 +410,6 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
                     try {
                         InetAddress client = InetAddress.getByName(ipstr);
                         socket.send(new DatagramPacket(bytes, bytes.length, client, MIN_PORT));
-                        socket.send(new DatagramPacket(bytes, bytes.length, client, MIN_PORT_LEGACY));
                         //Log.i("KDE/LanLinkProvider","Udp identity package sent to address "+client);
                     } catch (Exception e) {
                         e.printStackTrace();
@@ -436,7 +433,6 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
             listening = true;
 
             udpServer = setupUdpListener(MIN_PORT);
-            udpServerOldPort = setupUdpListener(MIN_PORT_LEGACY);
 
             // Due to certificate request from SSL server to client, the certificate request message from device with latest android version to device with
             // old android version causes a FATAL ALERT message stating that incorrect certificate request
@@ -468,11 +464,6 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
         } catch (Exception e) {
             e.printStackTrace();
         }
-        try {
-            udpServerOldPort.close();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
     }
 
     @Override