Added logic to provide configuration parameters in app.config-file. From now on…

Added logic to provide configuration parameters in app.config-file. From now on the application only continues if the defined serial number matches the number of the connected tracker.

GazeWebSocketServer/App.config

 <?xml version="1.0" encoding="utf-8" ?>
 <configuration>
+  <appSettings>
+    <add key="TrackerSerialNumber" value="" />
+    <add key="TrackerFrequency_Hz" value="600" />
+    <add key="WebSocketPort" value="8001" />
+    <add key="WebSocketEndpoint" value="/gaze" />
+    <add key="DebugFlag" value="false" />
+  </appSettings>
     <startup> 
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
     </startup>

GazeWebSocketServer/ClassDiagram1.cd

+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram MajorVersion="1" MinorVersion="1">
+  <Class Name="GazeWebSocketServer.ConfigurationData">
+    <Position X="0.5" Y="2.25" Width="2" />
+    <TypeIdentifier>
+      <HashCode>gEAAQAAAAAAAYAAAAAAAAAAQAAAgBAAAAAAAAAAAAAA=</HashCode>
+      <FileName>ConfigurationData.cs</FileName>
+    </TypeIdentifier>
+  </Class>
+  <Class Name="GazeWebSocketServer.EyeTrackerClient">
+    <Position X="6" Y="0.5" Width="1.75" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAACAAAAAABAAAAAAEAQAAAAAAIAAAAAAAAAA=</HashCode>
+      <FileName>EyeTrackerClient.cs</FileName>
+    </TypeIdentifier>
+    <ShowAsAssociation>
+      <Field Name="gazeDataProcessor" />
+    </ShowAsAssociation>
+  </Class>
+  <Class Name="GazeWebSocketServer.GazeCoordinateBehavior">
+    <Position X="2.5" Y="0.5" Width="2.25" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAgAAAAAAAAAA=</HashCode>
+      <FileName>GazeCoordinateBehavior.cs</FileName>
+    </TypeIdentifier>
+    <ShowAsAssociation>
+      <Field Name="eyeTrackerClient" />
+    </ShowAsAssociation>
+  </Class>
+  <Class Name="GazeWebSocketServer.GazeDataProcessor">
+    <Position X="9.5" Y="0.5" Width="1.75" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAAABAQAAAAAAAAAAAAAAAAAAAAAAAQAAAAAA=</HashCode>
+      <FileName>GazeDataProcessor.cs</FileName>
+    </TypeIdentifier>
+  </Class>
+  <Class Name="GazeWebSocketServer.Program" Collapsed="true">
+    <Position X="0.5" Y="0.5" Width="1.5" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAA=</HashCode>
+      <FileName>Program.cs</FileName>
+    </TypeIdentifier>
+  </Class>
+  <Struct Name="GazeWebSocketServer.GazeData" Collapsed="true">
+    <Position X="0.5" Y="1.25" Width="1.5" />
+    <TypeIdentifier>
+      <HashCode>QAAAAAAAAAAAAAAEAAgAAAAAAAAAAAAAAAAAAAAAgAA=</HashCode>
+      <FileName>GazeData.cs</FileName>
+    </TypeIdentifier>
+  </Struct>
+  <Font Name="Segoe UI" Size="9" />
+</ClassDiagram>
\ No newline at end of file

GazeWebSocketServer/ConfigurationData.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Configuration;
+
+namespace GazeWebSocketServer
+{
+    public class ConfigurationData
+    {
+        public string TrackerSerialNumber { get; private set; }
+        public float TrackerFrequency { get; private set; }
+        public int WebSocketPort { get; private set; }
+        public string WebSocketEndpoint { get; private set; }
+        public bool DebugFlag { get; private set; }
+
+        public static ConfigurationData ParseToObject()
+        {
+            ConfigurationData result = new ConfigurationData
+            {
+                TrackerSerialNumber = ConfigurationManager.AppSettings["TrackerSerialNumber"],
+                TrackerFrequency = float.Parse(ConfigurationManager.AppSettings["TrackerFrequency_Hz"]),
+                WebSocketPort = int.Parse(ConfigurationManager.AppSettings["WebSocketPort"]),
+                WebSocketEndpoint = ConfigurationManager.AppSettings["WebSocketEndpoint"],
+                DebugFlag = bool.Parse(ConfigurationManager.AppSettings["DebugFlag"])
+            };
+            return result;
+        }
+
+        public static void InitializeUnexistingWithDefaults()
+        {
+            InitializeSetting("TrackerSerialNumber", "");
+            InitializeSetting("TrackerFrequency_Hz", "600");
+            InitializeSetting("WebSocketPort", "8001");
+            InitializeSetting("WebSocketEndpoint", "/gaze");
+            InitializeSetting("DebugFlag", "false");
+        }
+
+        private static void InitializeSetting(string key, string value)
+        {
+            try
+            {
+                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+                var settings = configFile.AppSettings.Settings;
+                if (settings[key] == null)
+                {
+                    settings.Add(key, value);
+                }
+                configFile.Save(ConfigurationSaveMode.Modified);
+                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
+            }
+            catch (ConfigurationErrorsException)
+            {
+                Console.WriteLine("Error writing app settings");
+            }
+        }
+    }
+}

GazeWebSocketServer/EyeTrackerClient.cs

@@ -13,7 +13,7 @@ namespace GazeWebSocketServer
         private GazeDataProcessor gazeDataProcessor;
         private List<GazeCoordinateBehavior> gazeCoordinateBehaviors;
 
-        public EyeTrackerClient()
+        public EyeTrackerClient(ConfigurationData config)
         {
             gazeCoordinateBehaviors = new List<GazeCoordinateBehavior>();
             while (eyeTracker == null)
@@ -21,11 +21,17 @@ namespace GazeWebSocketServer
                 EyeTrackerCollection eyeTrackers = EyeTrackingOperations.FindAllEyeTrackers();
                 if (eyeTrackers.Count > 0)
                 {
-                    eyeTracker = eyeTrackers[0];
+                    foreach(IEyeTracker t in eyeTrackers)
+                    {
+                        if(config.TrackerSerialNumber == t.SerialNumber)
+                        {
+                            eyeTracker = t;
+                        }
+                    }
                 }
             }
             gazeDataProcessor = new GazeDataProcessor();
-            eyeTracker.SetGazeOutputFrequency(120f);
+            eyeTracker.SetGazeOutputFrequency(config.TrackerFrequency);
         }
 
         public void Start(GazeCoordinateBehavior gazeCoordinateBehavior)

GazeWebSocketServer/GazeCoordinateBehavior.cs

@@ -10,10 +10,10 @@ namespace GazeWebSocketServer
     {
         private EyeTrackerClient eyeTrackerClient;
 
-        public GazeCoordinateBehavior()
+        public GazeCoordinateBehavior(ConfigurationData config)
         {
             Console.WriteLine("Creating behavior...");
-            eyeTrackerClient = new EyeTrackerClient();
+            eyeTrackerClient = new EyeTrackerClient(config);
             eyeTrackerClient.Start(this);
         }
 

GazeWebSocketServer/GazeWebSocketServer.csproj

@@ -37,6 +37,7 @@
   <ItemGroup>
     <Reference Include="PresentationFramework" />
     <Reference Include="System" />
+    <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
@@ -52,6 +53,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="ConfigurationData.cs" />
     <Compile Include="EyeTrackerClient.cs" />
     <Compile Include="GazeCoordinateBehavior.cs" />
     <Compile Include="GazeData.cs" />
@@ -61,6 +63,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
+    <None Include="ClassDiagram1.cd" />
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

GazeWebSocketServer/Program.cs

@@ -9,9 +9,12 @@ namespace GazeWebSocketServer
     {
         public static void Main(string[] args)
         {
-            var wssv = new WebSocketServer(8001);
-            GazeCoordinateBehavior behavior = new GazeCoordinateBehavior();
-            wssv.AddWebSocketService("/gaze", () => behavior);
+            ConfigurationData.InitializeUnexistingWithDefaults();
+            ConfigurationData config = ConfigurationData.ParseToObject();
+
+            var wssv = new WebSocketServer(config.WebSocketPort);
+            GazeCoordinateBehavior behavior = new GazeCoordinateBehavior(config);
+            wssv.AddWebSocketService(config.WebSocketEndpoint, () => behavior);
 
             wssv.Start();
             Console.ReadKey(true);