Some minor tweaks and fixes

DS4Windows/DS4Control/ControlService.cs

@@ -257,14 +257,26 @@ namespace DS4Windows
             }
 
             await Task.Delay(100);
-            _udpServer.Start(getUDPServerPortNum());
 
-            foreach (DS4Device dev in devices)
+            var UDP_SERVER_PORT = Global.getUDPServerPortNum();
+            try
             {
-                dev.queueEvent(() =>
+                _udpServer.Start(UDP_SERVER_PORT);
+                foreach (DS4Device dev in devices)
                 {
-                    dev.Report += dev.MotionEvent;
-                });
+                    dev.queueEvent(() =>
+                    {
+                        dev.Report += dev.MotionEvent;
+                    });
+                }
+                LogDebug("UDP server listening on port " + UDP_SERVER_PORT);
+            }
+            catch (System.Net.Sockets.SocketException ex)
+            {
+                var errMsg = String.Format("Couldn't start UDP server on port {0}, outside applications won't be able to access pad data ({1})", UDP_SERVER_PORT, ex.SocketErrorCode);
+
+                LogDebug(errMsg, true);
+                Log.LogToTray(errMsg, true, true);
             }
 
             changingUDPPort = false;

DS4Windows/DS4Forms/DS4Form.Designer.cs

@@ -1234,7 +1234,6 @@
             resources.ApplyResources(this.ckUdpServ, "ckUdpServ");
             this.ckUdpServ.Name = "ckUdpServ";
             this.ckUdpServ.UseVisualStyleBackColor = true;
-            this.ckUdpServ.CheckedChanged += new System.EventHandler(this.CkUdpServ_CheckedChanged);
             // 
             // nUDUdpPortNum
             // 
@@ -1255,7 +1254,6 @@
             0,
             0,
             0});
-            this.nUDUdpPortNum.Leave += new System.EventHandler(this.NUDUdpPortNum_Leave);
             // 
             // languagePackComboBox1
             // 

DS4Windows/DS4Forms/DS4Form.cs

@@ -400,9 +400,12 @@ namespace DS4Windows
             StartWindowsCheckBox.CheckedChanged += new EventHandler(StartWindowsCheckBox_CheckedChanged);
             new ToolTip().SetToolTip(StartWindowsCheckBox, Properties.Resources.RunAtStartup);
 
-            ckUdpServ.Checked = isUsingUDPServer();
+            ckUdpServ.Checked = nUDUdpPortNum.Enabled = isUsingUDPServer();
             nUDUdpPortNum.Value = getUDPServerPortNum();
 
+            ckUdpServ.CheckedChanged += CkUdpServ_CheckedChanged;
+            nUDUdpPortNum.Leave += NUDUdpPortNum_Leave;
+
             populateHoverTextDict();
 
             cBController1.KeyPress += CBController_KeyPress;
@@ -2568,9 +2571,13 @@ Properties.Resources.DS4Update, MessageBoxButtons.YesNo, MessageBoxIcon.Question
 
         private void NUDUdpPortNum_Leave(object sender, EventArgs e)
         {
-            nUDUdpPortNum.Enabled = false;
-            setUDPServerPort((int)nUDUdpPortNum.Value);
-            WaitUDPPortChange();
+            int curValue = (int)nUDUdpPortNum.Value;
+            if (curValue != getUDPServerPortNum())
+            {
+                setUDPServerPort(curValue);
+                nUDUdpPortNum.Enabled = false;
+                WaitUDPPortChange();
+            }
         }
 
         private async void WaitUDPPortChange()