diff --git a/ADIS_Csharp/RobotClientWpf/App.config b/ADIS_Csharp/RobotClientWpf/App.config
new file mode 100644
index 0000000..3c63dea
--- /dev/null
+++ b/ADIS_Csharp/RobotClientWpf/App.config
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <configSections>
+        <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
+            <section name="RobotClientWpf.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
+        </sectionGroup>
+    </configSections>
+    <userSettings>
+        <RobotClientWpf.Properties.Settings>
+            <setting name="MqttBrokerIp" serializeAs="String">
+                <value />
+            </setting>
+        </RobotClientWpf.Properties.Settings>
+    </userSettings>
+</configuration>
\ No newline at end of file
diff --git a/ADIS_Csharp/RobotClientWpf/MainWindow.xaml b/ADIS_Csharp/RobotClientWpf/MainWindow.xaml
index f301bf1..16c7d40 100644
--- a/ADIS_Csharp/RobotClientWpf/MainWindow.xaml
+++ b/ADIS_Csharp/RobotClientWpf/MainWindow.xaml
@@ -7,22 +7,22 @@
         xmlns:views="clr-namespace:RobotClientWpf.Views"
         xmlns:dj="clr-namespace:DJ;assembly=NLogViewer"
         mc:Ignorable="d" FontSize="15"
-        Title="Challenge UI" Height="700" Width="1200" WindowStartupLocation="CenterScreen" ResizeMode="NoResize">
+        Title="Challenge UI" Height="700" Width="1200" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" Closing="Window_Closing" Loaded="Window_Loaded">
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="40"/>
             <RowDefinition Height="*"/>
-            <RowDefinition Height="150"/>
+            <RowDefinition Height="200"/>
             <RowDefinition Height="30"/>
         </Grid.RowDefinitions>
 
-        <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="5">
+        <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="5,5,5,5" Grid.ColumnSpan="2">
             <Label HorizontalAlignment="Center">MQTT Broker IP:</Label>
             <TextBox x:Name="tbIp" Width="120" Height="25" FontSize="15" TextAlignment="Left" Margin="10 0 0 0">192.168.156.156</TextBox>
             <Button x:Name="btnConnectDisconnect" Content="Connect" Width="100" Margin="20 0 0 0" Click="btnConnectDisconnect_Click"></Button>
         </StackPanel>
 
-        <TabControl Grid.Row="1" x:Name="tabControlMain">
+        <TabControl Grid.Row="1" x:Name="tabControlMain" Grid.ColumnSpan="2">
             <TabControl.ItemContainerStyle>
                 <Style TargetType="{x:Type TabItem}">
                     <Setter Property="Header" Value="{Binding Header}" />
@@ -35,7 +35,7 @@
                         <TextBlock Text="  Main" Foreground="Green" FontSize="16" />
                     </StackPanel>
                 </TabItem.Header>
-                <views:MainView/>
+                <views:MainView x:Name="mainView"/>
             </TabItem>
             <TabItem>
                 <TabItem.Header>
@@ -44,11 +44,11 @@
                         <TextBlock Text="  Config" Foreground="Blue" FontSize="16"/>
                     </StackPanel>
                 </TabItem.Header>
-                <views:ConfigView/>
+                <views:ConfigView x:Name="configView"/>
             </TabItem>
         </TabControl>
 
-        <dj:NLogViewer Grid.Row="2" Margin="10 0 10 0" DebugForeground="Black" MaxCount="150" ErrorForeground="Black" FatalForeground="Black" TraceForeground="Black" InfoForeground="Black" WarnForeground="Black">
+        <dj:NLogViewer Grid.Row="2" Margin="5" DebugForeground="Black" MaxCount="150" ErrorForeground="Black" FatalForeground="Black" TraceForeground="Black" InfoForeground="Black" WarnForeground="Black" >
             <dj:NLogViewer.WarnBackground>
                 <SolidColorBrush Color="#FFFF9D00" Opacity="0.5"/>
             </dj:NLogViewer.WarnBackground>
@@ -72,7 +72,7 @@
             
         </RichTextBox>-->
 
-        <StackPanel Grid.Row="3" Orientation="Horizontal">
+        <StackPanel Grid.Row="3" Orientation="Horizontal" Grid.ColumnSpan="2" Margin="0,150,0,0" Grid.RowSpan="2">
             <TextBlock x:Name="tbBottomMessage" FontSize="15" Margin="10 5"/>
         </StackPanel>
     </Grid>
diff --git a/ADIS_Csharp/RobotClientWpf/MainWindow.xaml.cs b/ADIS_Csharp/RobotClientWpf/MainWindow.xaml.cs
index d5d2221..0830e25 100644
--- a/ADIS_Csharp/RobotClientWpf/MainWindow.xaml.cs
+++ b/ADIS_Csharp/RobotClientWpf/MainWindow.xaml.cs
@@ -1,8 +1,10 @@
 using System;
 using System.Net;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Media;
+using RobotClientWpf.Properties;
 using RobotClientWpf.Utilities;
 using RobotLib;
 
@@ -13,14 +15,38 @@ namespace RobotClientWpf
     /// </summary>
     public partial class MainWindow : Window
     {
+        private bool startupCanceled;
+        private static Mutex? mutex;  // mutex with unique key
+        private static readonly string mutexName = "00489402-435c-426e-9d11-9a2b839b39b6";  // random guid
+
         private static readonly NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();
-        private ChallengeFactory challenge;
+        private ChallengeFactory? challenge;
         private bool manualDisconnect;
 
         public MainWindow()
         {
+            // Check if another instance is already running
+            // There is already an instance running of this program
+            if (Mutex.TryOpenExisting(mutexName, out mutex))
+            {
+                MessageBox.Show("Another instance of RobotClientWpf is already running!" + Environment.NewLine +
+                 "You cannot open multiple instances.", "Already running", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+                startupCanceled = true;
+                Application.Current.Shutdown();
+                return;
+            }
+
+            // new mutex and keep Alive
+            mutex = new Mutex(false, mutexName);
+            GC.KeepAlive(mutex);
+
+            // start window
             InitializeComponent();
             this.challenge = new ChallengeFactory();
+            // inform other views about challenge factory
+            this.mainView.SetChallengeFactory(this.challenge);
+            this.configView.SetChallengeFactory(this.challenge);
+            // subscribe to events
             this.challenge.PublisherSubscriber.ConnectionStateChanged += PublisherSubscriber_ConnectionStateChanged;
         }
 
@@ -74,7 +100,7 @@ namespace RobotClientWpf
                     string ipAddress = UIAccessHelpers.GetTextboxText(tbIp);
                     if (IPAddress.TryParse(ipAddress, out _))
                     {
-                        var connectionSuccess = this.challenge.PublisherSubscriber.Connect(ipAddress);
+                        var connectionSuccess = this.challenge.PublisherSubscriber.Connect(ipAddress, "ADIS", "TEST");
                         if (connectionSuccess)
                         {
                             this.DisplayBottomMessage(MessageSeverity.Success, "Successfully connected to MQTT broker.");
@@ -132,5 +158,20 @@ namespace RobotClientWpf
         {
             this.DisplayBottomMessage(MessageSeverity.Information, "");
         }
+
+        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
+        {
+            if (!startupCanceled)
+            {
+                // save settings
+                Settings.Default.MqttBrokerIp = this.tbIp.Text;
+                Settings.Default.Save();
+            }
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            this.tbIp.Text = Settings.Default.MqttBrokerIp;
+        }
     }
 }
diff --git a/ADIS_Csharp/RobotClientWpf/RobotClientWpf.csproj b/ADIS_Csharp/RobotClientWpf/RobotClientWpf.csproj
index 8eb45f0..02c5250 100644
--- a/ADIS_Csharp/RobotClientWpf/RobotClientWpf.csproj
+++ b/ADIS_Csharp/RobotClientWpf/RobotClientWpf.csproj
@@ -29,10 +29,22 @@
     </Resource>
   </ItemGroup>
 
+  <ItemGroup>
+    <Compile Update="Properties\Settings.Designer.cs">
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+    </Compile>
+  </ItemGroup>
+
   <ItemGroup>
     <None Update="NLog.config">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
   </ItemGroup>
 
 </Project>
diff --git a/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml b/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml
index 97a0623..0f8f2f3 100644
--- a/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml
+++ b/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml
@@ -7,7 +7,28 @@
              mc:Ignorable="d" 
              d:DesignHeight="450" d:DesignWidth="800">
     <Grid>
-        <Label Content="Config" HorizontalAlignment="Left" Margin="190,132,0,0" VerticalAlignment="Top"/>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="2*"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="120"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
 
+        <GroupBox Grid.Row="0" Grid.Column="0" Header="SplitFlap Configuration">
+            <DockPanel>
+                <Label DockPanel.Dock="Top">Configure Hardware IDs:</Label>
+                <Label VerticalAlignment="Center">0:</Label>
+                <TextBox x:Name="tbSf1" TextAlignment="Center" Width="30" Height="30" Margin="10 0"></TextBox>
+                <Label VerticalAlignment="Center">1:</Label>
+                <TextBox x:Name="tbSf2" TextAlignment="Center" Width="30" Height="30" Margin="10 0"></TextBox>
+                <Label VerticalAlignment="Center">2:</Label>
+                <TextBox x:Name="tbSf3" TextAlignment="Center" Width="30" Height="30" Margin="10 0"></TextBox>
+                <Label VerticalAlignment="Center">3:</Label>
+                <TextBox x:Name="tbSf4" TextAlignment="Center" Width="30" Height="30" Margin="10 0"></TextBox>
+                <Button x:Name="btnApplyConfiguration" Content="Apply" HorizontalAlignment="Right" Height="30" Width="100" Margin="10" Click="btnApplyConfiguration_Click"/>
+            </DockPanel>
+        </GroupBox>
     </Grid>
 </UserControl>
diff --git a/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml.cs b/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml.cs
index f7dfbd6..271f794 100644
--- a/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml.cs
+++ b/ADIS_Csharp/RobotClientWpf/Views/ConfigView.xaml.cs
@@ -1,17 +1,8 @@
-using System;
+using RobotClientWpf.Utilities;
+using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 
 namespace RobotClientWpf.Views
 {
@@ -20,9 +11,55 @@ namespace RobotClientWpf.Views
     /// </summary>
     public partial class ConfigView : UserControl
     {
+        private static readonly NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();
+        private ChallengeFactory? challenge;
+
         public ConfigView()
         {
             InitializeComponent();
         }
+
+        public void SetChallengeFactory(ChallengeFactory challenge)
+        {
+            this.challenge = challenge;
+        }
+
+        private void btnApplyConfiguration_Click(object sender, RoutedEventArgs e)
+        {
+            List<TextBox> splitFlapTextboxes = new List<TextBox>() { tbSf1, tbSf2, tbSf3, tbSf4 };
+            int setupIdCounter = 0;  // counting setup ID from 0
+            foreach (var textbox in splitFlapTextboxes)
+            {
+                this.GetHwIdFromTbAndSendMqtt(textbox, setupIdCounter++);
+                UIAccessHelpers.SetTextboxText(textbox, "");
+            }
+        }
+
+
+        private void GetHwIdFromTbAndSendMqtt(TextBox tb, int id)
+        {
+            if(challenge != null)
+            {
+                string text = UIAccessHelpers.GetTextboxText(tb);
+                // if nothing is in the textbox
+                if (String.IsNullOrEmpty(text))
+                {
+                    return;
+                }
+
+                int hwId;
+                if(int.TryParse(text, out hwId) == false)
+                {
+                    log.Warn($"Failed to parse HardwareID={text} given for Splitflap id={id}");
+                    return;
+                }
+                    
+                this.challenge.RobotStationary.SplitFlap.ConfigureSplitflap(id, hwId);
+            }
+            else
+            {
+                log.Error("challenge object is null");
+            }
+        }
     }
 }
diff --git a/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml b/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml
index 37b735b..8377738 100644
--- a/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml
+++ b/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml
@@ -7,7 +7,18 @@
              mc:Ignorable="d" 
              d:DesignHeight="450" d:DesignWidth="800">
     <Grid>
-        <Label Content="Main" HorizontalAlignment="Left" Margin="443,192,0,0" VerticalAlignment="Top"/>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="200"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="120"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <GroupBox Grid.Row="0" Grid.Column="1" Header="Splitflap Display" Margin="10" HorizontalAlignment="Right">
+            <TextBox x:Name="tbSplitflapText" Height="70" Width="150" FontSize="30" IsReadOnly="True" TextWrapping="NoWrap"/>
+
+        </GroupBox>
 
     </Grid>
 </UserControl>
diff --git a/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml.cs b/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml.cs
index 8e7df43..e7d91f6 100644
--- a/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml.cs
+++ b/ADIS_Csharp/RobotClientWpf/Views/MainView.xaml.cs
@@ -1,17 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows;
+using RobotClientWpf.Utilities;
 using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 
 namespace RobotClientWpf.Views
 {
@@ -20,9 +8,24 @@ namespace RobotClientWpf.Views
     /// </summary>
     public partial class MainView : UserControl
     {
+        private static readonly NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();
+        private ChallengeFactory? challenge;
+
         public MainView()
         {
             InitializeComponent();
         }
+
+        public void SetChallengeFactory(ChallengeFactory challenge)
+        {
+            this.challenge = challenge;
+            // subscribe to events
+            this.challenge.RobotStationary.SplitFlap.SplitFlapDisplayChanged += this.SplitFlap_SplitFlapDisplayChanged;
+        }
+
+        public void SplitFlap_SplitFlapDisplayChanged(object? sender, RobotLib.SplitFlap.SplitFlapDisplayEventArgs e)
+        {
+            UIAccessHelpers.SetTextboxText(this.tbSplitflapText, e.DisplayMessage);
+        }
     }
 }