Working proof-of-concept for refactoring

Implemented orchestrator
Implemented mock device
Implemented serial device
Implemented volume action
Removed old implementation

Arduino/MassiveKnob/MassiveKnob.ino

@@ -9,8 +9,7 @@ const byte KnobCount = 1;
 
 // For each potentiometer, specify the port
 const byte KnobPin[KnobCount] = {
-//  A0,
+  A2 
-  A1
 };
 
 // Minimum time between reporting changing values, reduces serial traffic
@@ -46,6 +45,7 @@ float emaValue[KnobCount];
 unsigned long currentTime;
 unsigned long lastPlot;
 
+
 void setup() 
 {
   Serial.begin(115200);
@@ -56,7 +56,10 @@ void setup()
 
   // Seed the moving average
   for (byte knobIndex = 0; knobIndex < KnobCount; knobIndex++)
+  {
+    pinMode(KnobPin[knobIndex], INPUT);
     emaValue[knobIndex] = analogRead(KnobPin[knobIndex]);
+  }
 
   for (byte seed = 1; seed < EMASeedCount - 1; seed++)
     for (byte knobIndex = 0; knobIndex < KnobCount; knobIndex++)
@@ -119,18 +122,28 @@ void processMessage(byte message)
     case 'Q':   // Quit
       processQuitMessage();
       break;
+
+    default:
+      outputError("Unknown message: " + (char)message);
+      break;
   }
 }
 
 
 void processHandshakeMessage()
 {
-  byte buffer[2];
+  byte buffer[3];
   if (Serial.readBytes(buffer, 3) < 3)
+  {
+    outputError("Invalid handshake length");
     return;
+  }
   
   if (buffer[0] != 'M' || buffer[1] != 'K')
+  {
+    outputError("Invalid handshake: " + String((char)buffer[0]) + String((char)buffer[1]) + String((char)buffer[2]));
     return;
+  }
 
   switch (buffer[2])
   {
@@ -147,6 +160,8 @@ void processHandshakeMessage()
       break;
 
     default:
+      outputMode = PlainText;
+      outputError("Unknown output mode: " + String((char)buffer[2]));
       return;
   }
 
@@ -185,6 +200,11 @@ void processQuitMessage()
 
 byte getVolume(byte knobIndex)
 {
+  analogRead(KnobPin[knobIndex]);
+  
+  // Give the ADC some time to stabilize
+  delay(10);
+  
   analogReadValue[knobIndex] = analogRead(KnobPin[knobIndex]);
   emaValue[knobIndex] = (EMAAlpha * analogReadValue[knobIndex]) + ((1 - EMAAlpha) * emaValue[knobIndex]);
   
@@ -228,3 +248,21 @@ void outputPlotter()
 
   Serial.println();
 }
+
+
+void outputError(String message)
+{
+  switch (outputMode)
+  {   
+    case Binary:
+      Serial.write('E');
+      Serial.write((byte)message.length());
+      Serial.print(message);
+      break;
+    
+    case PlainText:
+      Serial.print("Error: ");
+      Serial.println(message);
+      break;
+  }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Actions/DeviceVolumeAction.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Threading.Tasks;
 using System.Windows.Controls;
+using AudioSwitcher.AudioApi;
+using MassiveKnob.Plugin.CoreAudio.Settings;
 
 namespace MassiveKnob.Plugin.CoreAudio.Actions
 {
@@ -12,45 +14,62 @@ namespace MassiveKnob.Plugin.CoreAudio.Actions
         public string Description { get; } = "Sets the volume for the selected device, regardless of the current default device.";
         
         
-        public IMassiveKnobActionInstance Create(IMassiveKnobActionContext context)
+        public IMassiveKnobActionInstance Create()
         {
-            return new Instance(context);
+            return new Instance();
         }
         
         
         private class Instance : IMassiveKnobAnalogAction
         {
-            private readonly Settings settings;
+            private IMassiveKnobActionContext actionContext;
+            private DeviceVolumeActionSettings settings;
+            private IDevice playbackDevice;
 
-            
+
-            public Instance(IMassiveKnobContext context)
+            public void Initialize(IMassiveKnobActionContext context)
             {
-                settings = context.GetSettings<Settings>();
+                actionContext = context;
+                settings = context.GetSettings<DeviceVolumeActionSettings>();
+                ApplySettings();
             }
-            
+
             
             public void Dispose()
             {
             }
 
-            
+
+            private void ApplySettings()
+            {
+                var coreAudioController = CoreAudioControllerInstance.Acquire();
+                playbackDevice = settings.DeviceId.HasValue ? coreAudioController.GetDevice(settings.DeviceId.Value) : null;
+            }
+
+
             public UserControl CreateSettingsControl()
             {
-                return null;
+                var viewModel = new DeviceVolumeActionSettingsViewModel(settings);
+                viewModel.PropertyChanged += (sender, args) =>
+                {
+                    if (!viewModel.IsSettingsProperty(args.PropertyName))
+                        return;
+                    
+                    actionContext.SetSettings(settings);
+                    ApplySettings();
+                };
+
+                return new DeviceVolumeActionSettingsView(viewModel);
             }
 
-
+            
-            public ValueTask AnalogChanged(byte value)
+            public async ValueTask AnalogChanged(byte value)
             {
-                // TODO set volume
+                if (playbackDevice == null)
-                return default;
+                    return;
+                
+                await playbackDevice.SetVolumeAsync(value);
             }
         }
-
-
-        private class Settings
-        {
-
-        }
     }
 }

Windows/MassiveKnob.Plugin.CoreAudio/CoreAudioControllerInstance.cs

@@ -0,0 +1,16 @@
+using System;
+using AudioSwitcher.AudioApi.CoreAudio;
+
+namespace MassiveKnob.Plugin.CoreAudio
+{
+    public static class CoreAudioControllerInstance
+    {
+        private static readonly Lazy<CoreAudioController> Instance = new Lazy<CoreAudioController>();
+        
+        
+        public static CoreAudioController Acquire()
+        {
+            return Instance.Value;
+        }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/MassiveKnob.Plugin.CoreAudio.csproj

@@ -46,10 +46,20 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Actions\DeviceVolumeAction.cs" />
+    <Compile Include="CoreAudioControllerInstance.cs" />
     <Compile Include="MassiveKnobCoreAudioPlugin.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="Settings\DeviceVolumeActionSettings.xaml.cs">
+    <Compile Include="Settings\DeviceVolumeActionSettings.cs" />
-      <DependentUpon>DeviceVolumeActionSettings.xaml</DependentUpon>
+    <Compile Include="Settings\DeviceVolumeActionSettingsView.xaml.cs">
+      <DependentUpon>DeviceVolumeActionSettingsView.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Settings\BaseDeviceSettings.cs" />
+    <Compile Include="Settings\BaseDeviceSettingsViewModel.cs" />
+    <Compile Include="Settings\DeviceVolumeActionSettingsViewModel.cs" />
+    <Compile Include="Strings.Designer.cs">
+      <DependentUpon>Strings.resx</DependentUpon>
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
     </Compile>
   </ItemGroup>
   <ItemGroup>
@@ -59,13 +69,21 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="AudioSwitcher.AudioApi.CoreAudio">
+      <Version>4.0.0-alpha5</Version>
+    </PackageReference>
     <PackageReference Include="System.Threading.Tasks.Extensions">
       <Version>4.5.4</Version>
     </PackageReference>
   </ItemGroup>
-  <ItemGroup />
   <ItemGroup>
-    <Page Include="Settings\DeviceVolumeActionSettings.xaml">
+    <EmbeddedResource Include="Strings.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Strings.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Include="Settings\DeviceVolumeActionSettingsView.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>

Windows/MassiveKnob.Plugin.CoreAudio/MassiveKnobCoreAudioPlugin.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using MassiveKnob.Plugin.CoreAudio.Actions;
 
 namespace MassiveKnob.Plugin.CoreAudio
@@ -17,5 +18,17 @@ namespace MassiveKnob.Plugin.CoreAudio
         {
             new DeviceVolumeAction()
         };
+
+
+        public MassiveKnobCoreAudioPlugin()
+        {
+            // My system suffers from this issue: https://github.com/xenolightning/AudioSwitcher/issues/40
+            // ...which causes the first call to the CoreAudioController to take up to 10 seconds,
+            // so initialise it as soon as possible. Bit of a workaround, but eh.
+            Task.Run(() =>
+            {
+                CoreAudioControllerInstance.Acquire();
+            });
+        }
     }
 }

Windows/MassiveKnob.Plugin.CoreAudio/Properties/AssemblyInfo.cs

@@ -1,5 +1,4 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following

Windows/MassiveKnob.Plugin.CoreAudio/Settings/BaseDeviceSettings.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace MassiveKnob.Plugin.CoreAudio.Settings
+{
+    public class BaseDeviceSettings
+    {
+        public Guid? DeviceId { get; set; }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Settings/BaseDeviceSettingsViewModel.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+using System.Windows;
+using AudioSwitcher.AudioApi;
+
+namespace MassiveKnob.Plugin.CoreAudio.Settings
+{
+    public class BaseDeviceSettingsViewModel : INotifyPropertyChanged
+    {
+        private readonly BaseDeviceSettings settings;
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private IList<PlaybackDeviceViewModel> playbackDevices;
+        private PlaybackDeviceViewModel selectedDevice;
+
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public IList<PlaybackDeviceViewModel> PlaybackDevices
+        {
+            get => playbackDevices;
+            set
+            {
+                playbackDevices = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public PlaybackDeviceViewModel SelectedDevice
+        {
+            get => selectedDevice;
+            set
+            {
+                if (value == selectedDevice)
+                    return;
+
+                selectedDevice = value;
+                settings.DeviceId = selectedDevice?.Id;
+                OnPropertyChanged();
+            }
+        }
+        // ReSharper restore UnusedMember.Global
+
+
+        public BaseDeviceSettingsViewModel(BaseDeviceSettings settings)
+        {
+            this.settings = settings;
+
+            Task.Run(async () =>
+            {
+                var coreAudioController = CoreAudioControllerInstance.Acquire();
+                var devices = await coreAudioController.GetPlaybackDevicesAsync();
+                var deviceViewModels = devices
+                    .OrderBy(d => d.FullName)
+                    .Select(PlaybackDeviceViewModel.FromDevice)
+                    .ToList();
+
+                Application.Current.Dispatcher.Invoke(() =>
+                {
+                    PlaybackDevices = deviceViewModels;
+                    SelectedDevice = deviceViewModels.SingleOrDefault(d => d.Id == settings.DeviceId);
+                });
+            });
+        }
+
+
+        public virtual bool IsSettingsProperty(string propertyName)
+        {
+            return propertyName != nameof(PlaybackDevices);
+        }
+
+
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+
+
+    public class PlaybackDeviceViewModel
+    {
+        public Guid Id { get; private set; }
+        public string DisplayName { get; private set; }
+
+
+        public static PlaybackDeviceViewModel FromDevice(IDevice device)
+        {
+            string displayFormat;
+
+            if ((device.State & DeviceState.Disabled) != 0)
+                displayFormat = Strings.DeviceDisplayNameDisabled;
+            else if ((device.State & DeviceState.Unplugged) != 0)
+                displayFormat = Strings.DeviceDisplayNameUnplugged;
+            else if ((device.State & DeviceState.NotPresent) != 0)
+                displayFormat = Strings.DeviceDisplayNameNotPresent;
+            else if ((device.State & DeviceState.Active) == 0)
+                displayFormat = Strings.DeviceDisplayNameInactive;
+            else
+                displayFormat = Strings.DeviceDisplayNameActive;
+
+            return new PlaybackDeviceViewModel
+            {
+                Id = device.Id,
+                DisplayName = string.Format(displayFormat, device.FullName)
+            };
+        }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettings.cs

@@ -0,0 +1,7 @@
+namespace MassiveKnob.Plugin.CoreAudio.Settings
+{
+    public class DeviceVolumeActionSettings : BaseDeviceSettings
+    {
+        // TODO OSD
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettings.xaml

@@ -1,12 +0,0 @@
-<UserControl x:Class="MassiveKnob.Plugin.CoreAudio.Settings.DeviceVolumeActionSettings"
-             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
-             xmlns:local="clr-namespace:MassiveKnob.Plugin.CoreAudio.Settings"
-             mc:Ignorable="d" 
-             d:DesignHeight="450" d:DesignWidth="800">
-    <Grid>
-            
-    </Grid>
-</UserControl>

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettings.xaml.cs

@@ -1,28 +0,0 @@
-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 MassiveKnob.Plugin.CoreAudio.Settings
-{
-    /// <summary>
-    /// Interaction logic for DeviceVolumeActionSettings.xaml
-    /// </summary>
-    public partial class DeviceVolumeActionSettings : UserControl
-    {
-        public DeviceVolumeActionSettings()
-        {
-            InitializeComponent();
-        }
-    }
-}

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettingsView.xaml

@@ -0,0 +1,14 @@
+<UserControl x:Class="MassiveKnob.Plugin.CoreAudio.Settings.DeviceVolumeActionSettingsView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:settings="clr-namespace:MassiveKnob.Plugin.CoreAudio.Settings"
+             mc:Ignorable="d" 
+             d:DesignHeight="200" d:DesignWidth="800"
+             d:DataContext="{d:DesignInstance settings:DeviceVolumeActionSettingsViewModel}">
+    <StackPanel Orientation="Vertical">
+        <TextBlock>Playback device</TextBlock>
+        <ComboBox ItemsSource="{Binding PlaybackDevices}" SelectedItem="{Binding SelectedDevice}" DisplayMemberPath="DisplayName" />
+    </StackPanel>
+</UserControl>

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettingsView.xaml.cs

@@ -0,0 +1,14 @@
+namespace MassiveKnob.Plugin.CoreAudio.Settings
+{
+    /// <summary>
+    /// Interaction logic for DeviceVolumeActionSettingsView.xaml
+    /// </summary>
+    public partial class DeviceVolumeActionSettingsView
+    {
+        public DeviceVolumeActionSettingsView(DeviceVolumeActionSettingsViewModel viewModel)
+        {
+            DataContext = viewModel;
+            InitializeComponent();
+        }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Settings/DeviceVolumeActionSettingsViewModel.cs

@@ -0,0 +1,10 @@
+namespace MassiveKnob.Plugin.CoreAudio.Settings
+{
+    public class DeviceVolumeActionSettingsViewModel : BaseDeviceSettingsViewModel
+    {
+        // ReSharper disable once SuggestBaseTypeForParameter - by design
+        public DeviceVolumeActionSettingsViewModel(DeviceVolumeActionSettings settings) : base(settings)
+        {
+        }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Strings.Designer.cs

@@ -0,0 +1,108 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace MassiveKnob.Plugin.CoreAudio {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Strings {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Strings() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("MassiveKnob.Plugin.CoreAudio.Strings", typeof(Strings).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0}.
+        /// </summary>
+        internal static string DeviceDisplayNameActive {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameActive", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Disabled).
+        /// </summary>
+        internal static string DeviceDisplayNameDisabled {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameDisabled", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Inactive).
+        /// </summary>
+        internal static string DeviceDisplayNameInactive {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameInactive", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Not present).
+        /// </summary>
+        internal static string DeviceDisplayNameNotPresent {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameNotPresent", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Unplugged).
+        /// </summary>
+        internal static string DeviceDisplayNameUnplugged {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameUnplugged", resourceCulture);
+            }
+        }
+    }
+}

Windows/MassiveKnob.Plugin.CoreAudio/Strings.resx

@@ -0,0 +1,135 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="DeviceDisplayNameActive" xml:space="preserve">
+    <value>{0}</value>
+  </data>
+  <data name="DeviceDisplayNameDisabled" xml:space="preserve">
+    <value>{0} (Disabled)</value>
+  </data>
+  <data name="DeviceDisplayNameInactive" xml:space="preserve">
+    <value>{0} (Inactive)</value>
+  </data>
+  <data name="DeviceDisplayNameNotPresent" xml:space="preserve">
+    <value>{0} (Not present)</value>
+  </data>
+  <data name="DeviceDisplayNameUnplugged" xml:space="preserve">
+    <value>{0} (Unplugged)</value>
+  </data>
+</root>

Windows/MassiveKnob.Plugin.MockDevice/Devices/MockDevice.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading;
 using System.Windows.Controls;
 using MassiveKnob.Plugin.MockDevice.Settings;
 
@@ -9,37 +10,86 @@ namespace MassiveKnob.Plugin.MockDevice.Devices
         public Guid DeviceId { get; } = new Guid("e1a4977a-abf4-4c75-a17d-fd8d3a8451ff");
         public string Name { get; } = "Mock device";
         public string Description { get; } = "Emulates the actual device but does not communicate with anything.";
-        
+
-        public IMassiveKnobDeviceInstance Create(IMassiveKnobContext context)
+        public IMassiveKnobDeviceInstance Create()
         {
-            return new Instance(context);
+            return new Instance();
         }
 
 
         private class Instance : IMassiveKnobDeviceInstance
         {
-            public Instance(IMassiveKnobContext context)
+            private IMassiveKnobDeviceContext deviceContext;
+            private MockDeviceSettings settings;
+            private Timer inputChangeTimer;
+
+            private int reportedAnalogInputCount;
+            private int reportedDigitalInputCount;
+            private readonly Random random = new Random();
+            
+            
+            public void Initialize(IMassiveKnobDeviceContext context)
             {
-                // TODO read settings
+                deviceContext = context;
+                settings = deviceContext.GetSettings<MockDeviceSettings>();
+                
+                ApplySettings();
             }
 
 
             public void Dispose()
             {
+                inputChangeTimer?.Dispose();
+            }
+
+
+            private void ApplySettings()
+            {
+                if (settings.AnalogCount != reportedAnalogInputCount ||
+                    settings.DigitalCount != reportedDigitalInputCount)
+                {
+                    deviceContext.Connected(new DeviceSpecs(settings.AnalogCount, settings.DigitalCount, 0, 0));
+
+                    reportedAnalogInputCount = settings.AnalogCount;
+                    reportedDigitalInputCount = settings.DigitalCount;
+                }
+
+
+                var interval = TimeSpan.FromSeconds(Math.Max(settings.Interval, 1));
+
+                if (inputChangeTimer == null)
+                    inputChangeTimer = new Timer(Tick, null, interval, interval);
+                else
+                    inputChangeTimer.Change(interval, interval);
             }
 
             
             public UserControl CreateSettingsControl()
             {
-                // TODO pass context
+                var viewModel = new MockDeviceSettingsViewModel(settings);
-                return new MockDeviceSettings();
+                viewModel.PropertyChanged += (sender, args) =>
+                {
+                    deviceContext.SetSettings(settings);
+                    ApplySettings();
+                };
+                
+                return new MockDeviceSettingsView(viewModel);
+            }
+            
+            
+            private void Tick(object state)
+            {
+                var totalInputCount = reportedAnalogInputCount + reportedDigitalInputCount;
+                if (totalInputCount == 0)
+                    return;
+                
+                var changeInput = random.Next(0, totalInputCount);
+                
+                if (changeInput < reportedAnalogInputCount)
+                    deviceContext.AnalogChanged(changeInput, (byte)random.Next(0, 101));
+                else
+                    deviceContext.DigitalChanged(changeInput - reportedAnalogInputCount, random.Next(0, 2) == 1);
             }
-        }
-
-
-        private class Settings
-        {
-            // TODO interval, etc.
         }
     }
 }

Windows/MassiveKnob.Plugin.MockDevice/MassiveKnob.Plugin.MockDevice.csproj

@@ -48,9 +48,11 @@
     <Compile Include="Devices\MockDevice.cs" />
     <Compile Include="MassiveKnobMockDevicePlugin.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="Settings\MockDeviceSettings.xaml.cs">
+    <Compile Include="Settings\MockDeviceSettingsView.xaml.cs">
-      <DependentUpon>MockDeviceSettings.xaml</DependentUpon>
+      <DependentUpon>MockDeviceSettingsView.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Settings\MockDeviceSettings.cs" />
+    <Compile Include="Settings\MockDeviceSettingsViewModel.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\MassiveKnob.Plugin\MassiveKnob.Plugin.csproj">
@@ -60,7 +62,7 @@
   </ItemGroup>
   <ItemGroup />
   <ItemGroup>
-    <Page Include="Settings\MockDeviceSettings.xaml">
+    <Page Include="Settings\MockDeviceSettingsView.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettings.cs

@@ -0,0 +1,9 @@
+namespace MassiveKnob.Plugin.MockDevice.Settings
+{
+    public class MockDeviceSettings
+    {
+        public int AnalogCount { get; set; } = 3;
+        public int DigitalCount { get; set; } = 1;
+        public int Interval { get; set; } = 5;
+    }
+}

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettings.xaml

@@ -1,24 +0,0 @@
-<UserControl x:Class="MassiveKnob.Plugin.MockDevice.Settings.MockDeviceSettings"
-             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
-             xmlns:local="clr-namespace:MassiveKnob.Plugin.MockDevice.Settings"
-             mc:Ignorable="d" d:DesignWidth="800">
-    <Grid>
-        <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="Auto" />
-            <ColumnDefinition Width="*" />
-        </Grid.ColumnDefinitions>
-
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-        </Grid.RowDefinitions>
-
-        <TextBlock Grid.Row="0" Grid.Column="0" Margin="4">Number of knobs</TextBlock>
-        <TextBox Grid.Row="0" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left"></TextBox>
-
-        <CheckBox Grid.Row="1" Grid.Column="1" Margin="4">Randomly change the volume</CheckBox>
-    </Grid>
-</UserControl>

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettings.xaml.cs

@@ -1,28 +0,0 @@
-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 MassiveKnob.Plugin.MockDevice.Settings
-{
-    /// <summary>
-    /// Interaction logic for MockDeviceSettings.xaml
-    /// </summary>
-    public partial class MockDeviceSettings : UserControl
-    {
-        public MockDeviceSettings()
-        {
-            InitializeComponent();
-        }
-    }
-}

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettingsView.xaml

@@ -0,0 +1,30 @@
+<UserControl x:Class="MassiveKnob.Plugin.MockDevice.Settings.MockDeviceSettingsView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:settings="clr-namespace:MassiveKnob.Plugin.MockDevice.Settings"
+             mc:Ignorable="d" d:DesignWidth="800" 
+             d:DataContext="{d:DesignInstance Type=settings:MockDeviceSettingsViewModel}">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <TextBlock Grid.Row="0" Grid.Column="0" Margin="4">Number of analog inputs</TextBlock>
+        <TextBox Grid.Row="0" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left" Text="{Binding AnalogCount}" />
+
+        <TextBlock Grid.Row="1" Grid.Column="0" Margin="4">Number of digital inputs</TextBlock>
+        <TextBox Grid.Row="1" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left" Text="{Binding DigitalCount}" />
+
+        <TextBlock Grid.Row="2" Grid.Column="0" Margin="4">Random change interval (seconds)</TextBlock>
+        <TextBox Grid.Row="2" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left" Text="{Binding Interval}" />
+    </Grid>
+</UserControl>

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettingsView.xaml.cs

@@ -0,0 +1,15 @@
+namespace MassiveKnob.Plugin.MockDevice.Settings
+{
+    /// <summary>
+    /// Interaction logic for MockDeviceSettingsView.xaml
+    /// </summary>
+    public partial class MockDeviceSettingsView
+    {
+        public MockDeviceSettingsView(MockDeviceSettingsViewModel settingsViewModel)
+        {
+            DataContext = settingsViewModel;
+            
+            InitializeComponent();
+        }
+    }
+}

Windows/MassiveKnob.Plugin.MockDevice/Settings/MockDeviceSettingsViewModel.cs

@@ -0,0 +1,67 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace MassiveKnob.Plugin.MockDevice.Settings
+{
+    public class MockDeviceSettingsViewModel : INotifyPropertyChanged
+    {
+        private readonly MockDeviceSettings settings;
+        public event PropertyChangedEventHandler PropertyChanged;
+
+
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public int AnalogCount
+        {
+            get => settings.AnalogCount;
+            set
+            {
+                if (value == settings.AnalogCount)
+                    return;
+
+                settings.AnalogCount = value;
+                OnPropertyChanged();
+            }
+        }
+        
+
+        public int DigitalCount
+        {
+            get => settings.DigitalCount;
+            set
+            {
+                if (value == settings.DigitalCount)
+                    return;
+
+                settings.DigitalCount = value;
+                OnPropertyChanged();
+            }
+        }
+        
+        
+        public int Interval
+        {
+            get => settings.Interval;
+            set
+            {
+                if (value == settings.Interval)
+                    return;
+
+                settings.Interval = value;
+                OnPropertyChanged();
+            }
+        }
+        // ReSharper restore UnusedMember.Global
+
+
+        public MockDeviceSettingsViewModel(MockDeviceSettings settings)
+        {
+            this.settings = settings;
+        }
+        
+        
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/Devices/SerialDevice.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Windows.Controls;
+using MassiveKnob.Plugin.SerialDevice.Settings;
+using MassiveKnob.Plugin.SerialDevice.Worker;
+
+namespace MassiveKnob.Plugin.SerialDevice.Devices
+{
+    public class SerialDevice : IMassiveKnobDevice
+    {
+        public Guid DeviceId { get; } = new Guid("65255f25-d8f6-426b-8f12-cf03c44a1bf5");
+        public string Name { get; } = "Serial device";
+        public string Description { get; } = "A Serial (USB) device which implements the Massive Knob Protocol.";
+
+        public IMassiveKnobDeviceInstance Create()
+        {
+            return new Instance();
+        }
+
+
+        private class Instance : IMassiveKnobDeviceInstance
+        {
+            private IMassiveKnobDeviceContext deviceContext;
+            private SerialDeviceSettings settings;
+            private SerialWorker worker;
+
+            public void Initialize(IMassiveKnobDeviceContext context)
+            {
+                deviceContext = context;
+                settings = deviceContext.GetSettings<SerialDeviceSettings>();
+
+                worker = new SerialWorker(context);
+                ApplySettings();
+            }
+
+
+            public void Dispose()
+            {
+                worker.Dispose();
+            }
+
+
+            private void ApplySettings()
+            {
+                worker.Connect(settings.PortName, settings.BaudRate);
+            }
+
+            
+            public UserControl CreateSettingsControl()
+            {
+                var viewModel = new SerialDeviceSettingsViewModel(settings);
+                viewModel.PropertyChanged += (sender, args) =>
+                {
+                    if (!viewModel.IsSettingsProperty(args.PropertyName))
+                        return;
+                    
+                    deviceContext.SetSettings(settings);
+                    ApplySettings();
+                };
+                
+                return new SerialDeviceSettingsView(viewModel);
+            }
+        }
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/MassiveKnob.Plugin.SerialDevice.csproj

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>MassiveKnob.Plugin.SerialDevice</RootNamespace>
+    <AssemblyName>MassiveKnob.Plugin.SerialDevice</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>$(localappdata)\MassiveKnob\Plugins\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Devices\SerialDevice.cs" />
+    <Compile Include="MassiveKnobSerialDevicePlugin.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Settings\SerialDeviceSettingsView.xaml.cs">
+      <DependentUpon>SerialDeviceSettingsView.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Settings\SerialDeviceSettingsViewModel.cs" />
+    <Compile Include="Settings\SerialDeviceSettings.cs" />
+    <Compile Include="Worker\SerialWorker.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\MassiveKnob.Plugin\MassiveKnob.Plugin.csproj">
+      <Project>{A1298BE4-1D23-416C-8C56-FC9264487A95}</Project>
+      <Name>MassiveKnob.Plugin</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Include="Settings\SerialDeviceSettingsView.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Windows/MassiveKnob.Plugin.SerialDevice/MassiveKnobSerialDevicePlugin.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+
+namespace MassiveKnob.Plugin.SerialDevice
+{
+    [MassiveKnobPlugin]
+    public class MassiveKnobSerialDevicePlugin : IMassiveKnobDevicePlugin
+    {
+        public Guid PluginId { get; } = new Guid("276475e6-5ff0-420f-82dc-8aff5e8631d5");
+        public string Name { get; } = "Serial Device";
+        public string Description { get; } = "A Serial (USB) device which implements the Massive Knob Protocol.";
+        public string Author { get; } = "Mark van Renswoude <mark@x2software.net>";
+        public string Url { get; } = "https://www.github.com/MvRens/MassiveKnob/";
+
+        public IEnumerable<IMassiveKnobDevice> Devices { get; } = new IMassiveKnobDevice[]
+        {
+            new Devices.SerialDevice()
+        };
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/Properties/AssemblyInfo.cs

@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("MassiveKnob.Plugin.SerialDevice")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("MassiveKnob.Plugin.SerialDevice")]
+[assembly: AssemblyCopyright("Copyright ©  2021")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("fc0d22d8-5f1b-4d85-8269-fa4837cde3a2")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Windows/MassiveKnob.Plugin.SerialDevice/Settings/SerialDeviceSettings.cs

@@ -0,0 +1,8 @@
+namespace MassiveKnob.Plugin.SerialDevice.Settings
+{
+    public class SerialDeviceSettings
+    {
+        public string PortName { get; set; } = null;
+        public int BaudRate { get; set; } = 115200;
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/Settings/SerialDeviceSettingsView.xaml

@@ -0,0 +1,27 @@
+<UserControl x:Class="MassiveKnob.Plugin.SerialDevice.Settings.SerialDeviceSettingsView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:settings="clr-namespace:MassiveKnob.Plugin.SerialDevice.Settings"
+             mc:Ignorable="d" 
+             d:DesignHeight="100" d:DesignWidth="800"
+             d:DataContext="{d:DesignInstance settings:SerialDeviceSettingsViewModel}">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <TextBlock Grid.Row="0" Grid.Column="0" Margin="4">Serial port</TextBlock>
+        <ComboBox Grid.Row="0" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left" ItemsSource="{Binding SerialPorts}" SelectedItem="{Binding PortName}" />
+
+        <TextBlock Grid.Row="1" Grid.Column="0" Margin="4">Baud rate</TextBlock>
+        <TextBox Grid.Row="1" Grid.Column="1" Margin="4" Width="150" HorizontalAlignment="Left" Text="{Binding BaudRate}" />
+    </Grid>
+</UserControl>

Windows/MassiveKnob.Plugin.SerialDevice/Settings/SerialDeviceSettingsView.xaml.cs

@@ -0,0 +1,14 @@
+namespace MassiveKnob.Plugin.SerialDevice.Settings
+{
+    /// <summary>
+    /// Interaction logic for SerialDeviceSettingsView.xaml
+    /// </summary>
+    public partial class SerialDeviceSettingsView
+    {
+        public SerialDeviceSettingsView(SerialDeviceSettingsViewModel viewModel)
+        {
+            DataContext = viewModel;
+            InitializeComponent();
+        }
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/Settings/SerialDeviceSettingsViewModel.cs

@@ -0,0 +1,77 @@
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.IO.Ports;
+using System.Runtime.CompilerServices;
+
+namespace MassiveKnob.Plugin.SerialDevice.Settings
+{
+    public class SerialDeviceSettingsViewModel : INotifyPropertyChanged
+    {
+        private readonly SerialDeviceSettings settings;
+        private IEnumerable<string> serialPorts;
+        public event PropertyChangedEventHandler PropertyChanged;
+
+
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public IEnumerable<string> SerialPorts
+        {
+            get => serialPorts;
+            set
+            {
+                serialPorts = value;
+                OnPropertyChanged();
+            }
+        }
+
+
+        public string PortName
+        {
+            get => settings.PortName;
+            set
+            {
+                if (value == settings.PortName)
+                    return;
+
+                settings.PortName = value;
+                OnPropertyChanged();
+            }
+        }
+        
+
+        public int BaudRate
+        {
+            get => settings.BaudRate;
+            set
+            {
+                if (value == settings.BaudRate)
+                    return;
+
+                settings.BaudRate = value;
+                OnPropertyChanged();
+            }
+        }
+        // ReSharper restore UnusedMember.Global
+
+
+        public SerialDeviceSettingsViewModel(SerialDeviceSettings settings)
+        {
+            this.settings = settings;
+
+            serialPorts = SerialPort.GetPortNames();
+            
+            // TODO subscribe to device notification to refresh list
+        }
+
+
+        public bool IsSettingsProperty(string propertyName)
+        {
+            return propertyName != nameof(SerialPorts);
+        }
+        
+        
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

Windows/MassiveKnob.Plugin.SerialDevice/Worker/SerialWorker.cs

@@ -0,0 +1,233 @@
+using System;
+using System.Diagnostics;
+using System.IO.Ports;
+using System.Text;
+using System.Threading;
+
+namespace MassiveKnob.Plugin.SerialDevice.Worker
+{
+    public class SerialWorker : IDisposable
+    {
+        private readonly IMassiveKnobDeviceContext context;
+
+        private readonly object workerLock = new object();
+        private string lastPortName;
+        private int lastBaudRate;
+        private Thread workerThread;
+        private CancellationTokenSource workerThreadCancellation = new CancellationTokenSource();
+
+        public SerialWorker(IMassiveKnobDeviceContext context)
+        {
+            this.context = context;
+        }
+        
+        
+        public void Dispose()
+        {
+            Disconnect();
+        }
+        
+        
+        public void Connect(string portName, int baudRate)
+        {
+            lock (workerLock)
+            {
+                if (portName == lastPortName && baudRate == lastBaudRate)
+                    return;
+
+                lastPortName = portName;
+                lastBaudRate = baudRate;
+
+                Disconnect();
+
+                if (string.IsNullOrEmpty(portName) || baudRate == 0)
+                    return;
+
+
+                workerThreadCancellation = new CancellationTokenSource();
+                workerThread = new Thread(() => RunWorker(workerThreadCancellation.Token, portName, baudRate))
+                {
+                    Name = "MassiveKnobSerialDevice Worker"
+                };
+                workerThread.Start();
+            }
+        }
+
+
+        private void Disconnect()
+        {
+            lock (workerLock)
+            {
+                workerThreadCancellation?.Cancel();
+
+                workerThreadCancellation = null;
+                workerThread = null;
+            }
+        }
+
+
+
+        private void RunWorker(CancellationToken cancellationToken, string portName, int baudRate)
+        {
+            context.Connecting();
+            while (!cancellationToken.IsCancellationRequested)
+            {
+                SerialPort serialPort = null;
+                DeviceSpecs specs = default;
+
+                void SafeCloseSerialPort()
+                {
+                    try
+                    {
+                        serialPort?.Dispose();
+                    }
+                    catch
+                    {
+                        // ignored
+                    }
+
+                    serialPort = null;
+                    context.Connecting();
+                }
+
+
+                while (serialPort == null && !cancellationToken.IsCancellationRequested)
+                {
+                    if (!TryConnect(ref serialPort, portName, baudRate, out specs))
+                    {
+                        SafeCloseSerialPort();
+                        Thread.Sleep(500);
+                    }
+                    else
+                        break;
+                }
+
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    SafeCloseSerialPort();
+                    break;
+                }
+
+                var processingMessage = false;
+
+                Debug.Assert(serialPort != null, nameof(serialPort) + " != null");
+                serialPort.DataReceived += (sender, args) =>
+                {
+                    if (args.EventType != SerialData.Chars || processingMessage)
+                        return;
+
+                    var senderPort = (SerialPort)sender;
+                    processingMessage = true;
+                    try
+                    {
+                        var message = (char)senderPort.ReadByte();
+                        ProcessMessage(senderPort, message);
+                    }
+                    finally
+                    {
+                        processingMessage = false;
+                    }
+                };
+
+
+                context.Connected(specs);
+                try
+                {
+                    // This is where sending data to the hardware would be implemented
+                    while (serialPort.IsOpen && !cancellationToken.IsCancellationRequested)
+                    {
+                        Thread.Sleep(10);
+                    }
+                }
+                catch
+                {
+                    // ignored
+                }
+
+                context.Disconnected();
+                SafeCloseSerialPort();
+
+                if (!cancellationToken.IsCancellationRequested)
+                    Thread.Sleep(500);
+            }
+        }
+
+
+        private static bool TryConnect(ref SerialPort serialPort, string portName, int baudRate, out DeviceSpecs specs)
+        {
+            try
+            {
+                serialPort = new SerialPort(portName, baudRate)
+                {
+                    Encoding = Encoding.ASCII,
+                    ReadTimeout = 1000, 
+                    WriteTimeout = 1000,
+                    DtrEnable = true // TODO make setting
+                };
+                serialPort.Open();
+
+                // Send handshake
+                serialPort.Write(new[] { 'H', 'M', 'K', 'B' }, 0, 4);
+
+                // Wait for reply
+                var response = serialPort.ReadByte();
+
+                if ((char) response == 'H')
+                {
+                    var knobCount = serialPort.ReadByte();
+                    if (knobCount > -1)
+                    {
+                        specs = new DeviceSpecs(knobCount, 0, 0, 0);
+                        return true;
+                    }
+                }
+                else
+                    CheckForError(serialPort, (char)response);
+
+                specs = default;
+                return false;
+            }
+            catch
+            {
+                specs = default;
+                return false;
+            }
+        }
+
+
+        private void ProcessMessage(SerialPort serialPort, char message)
+        {
+            switch (message)
+            {
+                case 'V':
+                    var knobIndex = (byte)serialPort.ReadByte();
+                    var volume = (byte)serialPort.ReadByte();
+
+                    if (knobIndex < 255 && volume <= 100)
+                        context.AnalogChanged(knobIndex, volume);
+
+                    break;
+            }
+        }
+
+
+        private static void CheckForError(SerialPort serialPort, char message)
+        {
+            if (message != 'E')
+                return;
+
+            var length = serialPort.ReadByte();
+            if (length <= 0)
+                return;
+
+            var buffer = new byte[length];
+            var bytesRead = 0;
+            
+            while (bytesRead < length)
+                bytesRead += serialPort.Read(buffer, bytesRead, length - bytesRead);
+
+            var errorMessage = Encoding.ASCII.GetString(buffer);
+            Debug.Print(errorMessage);
+        }
+    }
+}

Windows/MassiveKnob.Plugin/IMassiveKnobAction.cs

@@ -19,12 +19,17 @@ namespace MassiveKnob.Plugin
         InputDigital = 1 << 1,
         
         /// <summary>
-        /// Can be assigned to an output, like an LED or relay.
+        /// Can be assigned to an analog output.
         /// </summary>
-        OutputSignal = 1 << 2
+        OutputAnalog = 1 << 2,
+
+        /// <summary>
+        /// Can be assigned to a digital output, like an LED or relay.
+        /// </summary>
+        OutputDigital = 1 << 3
     }
-    
+
-    
+
     /// <summary>
     /// Provides information about an action which can be assigned to a knob or button.
     /// </summary>
@@ -53,7 +58,6 @@ namespace MassiveKnob.Plugin
         /// <summary>
         /// Called when an action is bound to a knob or button to create an instance of the action.
         /// </summary>
-        /// <param name="context">Provides an interface to the Massive Knob settings and device. Can be stored until the action instance is disposed.</param>
+        IMassiveKnobActionInstance Create();
-        IMassiveKnobActionInstance Create(IMassiveKnobActionContext context);
     }
 }

Windows/MassiveKnob.Plugin/IMassiveKnobActionContext.cs

@@ -4,9 +4,15 @@
     public interface IMassiveKnobActionContext : IMassiveKnobContext
     {
         /// <summary>
-        /// Sets the state of the signal. Only valid for OutputSignal action types, will raise an exception otherwise.
+        /// Sets the state of the analog output. Only valid for OutputAnalog action types, will raise an exception otherwise.
+        /// </summary>
+        /// <param name="value">The analog value in the range of 0 to 100.</param>
+        void SetAnalogOutput(byte value);
+
+        /// <summary>
+        /// Sets the state of the digital output. Only valid for OutputDigital action types, will raise an exception otherwise.
         /// </summary>
         /// <param name="on">Whether the signal is on or off.</param>
-        void SetSignal(bool on);
+        void SetDigitalOutput(bool on);
     }
 }

Windows/MassiveKnob.Plugin/IMassiveKnobActionInstance.cs

@@ -9,6 +9,12 @@ namespace MassiveKnob.Plugin
     /// </summary>
     public interface IMassiveKnobActionInstance : IDisposable
     {
+        /// <summary>
+        /// Called right after this instance is created.
+        /// </summary>
+        /// <param name="context">Provides an interface to the Massive Knob settings and device. Can be stored until the action instance is disposed.</param>
+        void Initialize(IMassiveKnobActionContext context);
+
         /// <summary>
         /// Called when an action should display it's settings. Assume the width is variable, height is
         /// determined by the UserControl. Return null to indicate there are no settings for this action.

Windows/MassiveKnob.Plugin/IMassiveKnobAnalogAction.cs

@@ -8,7 +8,7 @@ namespace MassiveKnob.Plugin
     public interface IMassiveKnobAnalogAction : IMassiveKnobActionInstance
     {
         /// <summary>
-        /// Called when a knob's position changes.
+        /// Called when an analog input's value changes.
         /// </summary>
         /// <param name="value">The new value. Range is 0 to 100.</param>
         ValueTask AnalogChanged(byte value);

Windows/MassiveKnob.Plugin/IMassiveKnobDevice.cs

@@ -25,7 +25,6 @@ namespace MassiveKnob.Plugin
         /// <summary>
         /// Called when the device is selected.
         /// </summary>
-        /// <param name="context">Provides an interface to the Massive Knob settings and device. Can be stored until the device instance is disposed.</param>
+        IMassiveKnobDeviceInstance Create();
-        IMassiveKnobDeviceInstance Create(IMassiveKnobContext context);
     }
 }

Windows/MassiveKnob.Plugin/IMassiveKnobDeviceContext.cs

@@ -0,0 +1,80 @@
+namespace MassiveKnob.Plugin
+{
+    /// <inheritdoc />
+    public interface IMassiveKnobDeviceContext : IMassiveKnobContext
+    {
+        /// <summary>
+        /// Call when an attempt is being made to connect to the device. If the connection is always ready
+        /// this call can be skipped.
+        /// </summary>
+        void Connecting();
+
+        /// <summary>
+        /// Call when the device is connected. This method must be called before AnalogChanged or DigitalChanged.
+        /// </summary>
+        /// <param name="specs">The specs as reported by the device.</param>
+        void Connected(DeviceSpecs specs);
+
+        /// <summary>
+        /// Call when the connection to the device has been lost.
+        /// </summary>
+        void Disconnected();
+
+        /// <summary>
+        /// Call when an analog input's value has changed.
+        /// </summary>
+        /// <param name="analogInputIndex">The index of the analog input. Must be within bounds of the value reported in Connected.</param>
+        /// <param name="value">The new value in the range from 0 to 100.</param>
+        void AnalogChanged(int analogInputIndex, byte value);
+
+        /// <summary>
+        /// Call when a digital input's state has changed.
+        /// </summary>
+        /// <param name="digitalInputIndex">The index of the digital input. Must be within bounds of the value reported in Connected.</param>
+        /// <param name="on">Whether the input is considered on or off.</param>
+        void DigitalChanged(int digitalInputIndex, bool on);
+    }
+
+
+    /// <summary>
+    /// Defines the specs as reported by the device.
+    /// </summary>
+    public readonly struct DeviceSpecs
+    {
+        /// <summary>
+        /// The number of analog input controls supported by the device.
+        /// </summary>
+        public readonly int AnalogInputCount;
+        
+        /// <summary>
+        /// The number of digital input controls supported by the device.
+        /// </summary>
+        public readonly int DigitalInputCount;
+
+        /// <summary>
+        /// The number of analog output controls supported by the device.
+        /// </summary>
+        public readonly int AnalogOutputCount;
+
+        /// <summary>
+        /// The number of digital output controls supported by the device.
+        /// </summary>
+        public readonly int DigitalOutputCount;
+
+
+        /// <summary>
+        /// Defines the specs as reported by the device.
+        /// </summary>
+        /// <param name="analogInputCount">The number of analog input controls supported by the device.</param>
+        /// <param name="digitalInputCount">The number of digital input controls supported by the device.</param>
+        /// <param name="analogOutputCount">The number of analog output controls supported by the device.</param>
+        /// <param name="digitalOutputCount">The number of digital output controls supported by the device.</param>
+        public DeviceSpecs(int analogInputCount, int digitalInputCount, int analogOutputCount, int digitalOutputCount)
+        {
+            AnalogInputCount = analogInputCount;
+            DigitalInputCount = digitalInputCount;
+            AnalogOutputCount = analogOutputCount;
+            DigitalOutputCount = digitalOutputCount;
+        }
+    }
+}

Windows/MassiveKnob.Plugin/IMassiveKnobDeviceInstance.cs

@@ -8,6 +8,12 @@ namespace MassiveKnob.Plugin
     /// </summary>
     public interface IMassiveKnobDeviceInstance : IDisposable
     {
+        /// <summary>
+        /// Called right after this instance is created.
+        /// </summary>
+        /// <param name="context">Provides an interface to the Massive Knob settings and device. Can be stored until the device instance is disposed.</param>
+        void Initialize(IMassiveKnobDeviceContext context);
+        
         /// <summary>
         /// Called when a device should display it's settings. Assume the width is variable, height is
         /// determined by the UserControl. Return null to indicate there are no settings for this device.

Windows/MassiveKnob.Plugin/IMassiveKnobDigitalAction.cs

@@ -1,9 +1,16 @@
-namespace MassiveKnob.Plugin
+using System.Threading.Tasks;
+
+namespace MassiveKnob.Plugin
 {
     /// <summary>
     /// Required to be implemented for Action type InputDigital. Receives an update when a knob's position changes.
     /// </summary>
     public interface IMassiveKnobDigitalAction : IMassiveKnobActionInstance
     {
+        /// <summary>
+        /// Called when a digital input's value changes.
+        /// </summary>
+        /// <param name="on">The new value.</param>
+        ValueTask DigitalChanged(bool on);
     }
 }

Windows/MassiveKnob.Plugin/MassiveKnob.Plugin.csproj

@@ -44,6 +44,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="IMassiveKnobDeviceContext.cs" />
     <Compile Include="IMassiveKnobActionContext.cs" />
     <Compile Include="IMassiveKnobActionInstance.cs" />
     <Compile Include="IMassiveKnobActionPlugin.cs" />
@@ -52,7 +53,7 @@
     <Compile Include="IMassiveKnobAnalogAction.cs" />
     <Compile Include="IMassiveKnobContext.cs" />
     <Compile Include="IMassiveKnobDevice.cs" />
-    <Compile Include="IMassiveKnobHardwarePlugin.cs" />
+    <Compile Include="IMassiveKnobDevicePlugin.cs" />
     <Compile Include="MassiveKnobPluginAttribute.cs" />
     <Compile Include="IMassiveKnobPlugin.cs" />
     <Compile Include="IMassiveKnobAction.cs" />

Windows/MassiveKnob.Plugin/Properties/AssemblyInfo.cs

@@ -1,5 +1,4 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following

Windows/MassiveKnob.sln

@@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MassiveKnob.Plugin.CoreAudi
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MassiveKnob.Plugin.MockDevice", "MassiveKnob.Plugin.MockDevice\MassiveKnob.Plugin.MockDevice.csproj", "{674DE974-B134-4DB5-BFAF-7BC3D05E16DE}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MassiveKnob.Plugin.SerialDevice", "MassiveKnob.Plugin.SerialDevice\MassiveKnob.Plugin.SerialDevice.csproj", "{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -33,6 +35,10 @@ Global
 		{674DE974-B134-4DB5-BFAF-7BC3D05E16DE}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{674DE974-B134-4DB5-BFAF-7BC3D05E16DE}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{674DE974-B134-4DB5-BFAF-7BC3D05E16DE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FC0D22D8-5F1B-4D85-8269-FA4837CDE3A2}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Windows/MassiveKnob/Hardware/AbstractMassiveKnobHardware.cs

@@ -1,69 +0,0 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
-
-namespace MassiveKnob.Hardware
-{
-    public abstract class AbstractMassiveKnobHardware : IMassiveKnobHardware
-    {
-        protected ObserverProxy Observers = new ObserverProxy();
-        
-        public void AttachObserver(IMassiveKnobHardwareObserver observer)
-        {
-            Observers.AttachObserver(observer);
-        }
-
-        public void DetachObserver(IMassiveKnobHardwareObserver observer)
-        {
-            Observers.DetachObserver(observer);
-        }
-
-
-        public abstract Task TryConnect();
-        public abstract Task Disconnect();
-
-
-        public class ObserverProxy : IMassiveKnobHardwareObserver
-        {
-            private readonly List<IMassiveKnobHardwareObserver> observers = new List<IMassiveKnobHardwareObserver>();
-
-            
-            public void AttachObserver(IMassiveKnobHardwareObserver observer)
-            {
-                observers.Add(observer);
-            }
-
-            public void DetachObserver(IMassiveKnobHardwareObserver observer)
-            {
-                observers.Remove(observer);
-            }
-
-
-            public void Connecting()
-            {
-                foreach (var observer in observers)
-                    observer.Connecting();
-            }
-
-            
-            public void Connected(int knobCount)
-            {
-                foreach (var observer in observers)
-                    observer.Connected(knobCount);
-            }
-            
-
-            public void Disconnected()
-            {
-                foreach (var observer in observers)
-                    observer.Disconnected();
-            }
-
-
-            public void VolumeChanged(int knob, int volume)
-            {
-                foreach (var observer in observers)
-                    observer.VolumeChanged(knob, volume);
-            }
-        }
-    }
-}

Windows/MassiveKnob/Hardware/CoreAudioDeviceManager.cs

@@ -1,82 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using AudioSwitcher.AudioApi;
-using AudioSwitcher.AudioApi.CoreAudio;
-
-namespace MassiveKnob.Hardware
-{
-    public class CoreAudioDeviceManager : IAudioDeviceManager
-    {
-        private readonly Lazy<CoreAudioController> audioController = new Lazy<CoreAudioController>();
-        private List<IAudioDevice> devices;
-
-
-        public void Dispose()
-        {
-            if (audioController.IsValueCreated)
-                audioController.Value.Dispose();
-        }
-
-        
-        public async Task<IEnumerable<IAudioDevice>> GetDevices()
-        {
-            return devices ?? (devices = (await audioController.Value.GetPlaybackDevicesAsync())
-                .Select(device => new AudioDevice(device) as IAudioDevice)
-                .ToList());
-        }
-
-        
-        public Task<IAudioDevice> GetDeviceById(Guid deviceId)
-        {
-            return Task.FromResult(devices?.FirstOrDefault(device => device.Id == deviceId));
-        }
-
-
-        private class AudioDevice : IAudioDevice
-        {
-            private readonly IDevice device;
-
-            public Guid Id { get; }
-            public string DisplayName { get; }
-
-
-            public AudioDevice(IDevice device)
-            {
-                this.device = device;
-                Id = device.Id;
-                
-                string displayFormat;
-
-                if ((device.State & DeviceState.Disabled) != 0)
-                    displayFormat = Strings.DeviceDisplayNameDisabled;
-                else if ((device.State & DeviceState.Unplugged) != 0)
-                    displayFormat = Strings.DeviceDisplayNameUnplugged;
-                else if ((device.State & DeviceState.NotPresent) != 0)
-                    displayFormat = Strings.DeviceDisplayNameNotPresent;
-                else if ((device.State & DeviceState.Active) == 0)
-                    displayFormat = Strings.DeviceDisplayNameInactive;
-                else
-                    displayFormat = Strings.DeviceDisplayNameActive;
-
-                DisplayName = string.Format(displayFormat, device.FullName);
-            }
-
-
-            public Task SetVolume(int volume)
-            {
-                return device.SetVolumeAsync(volume);
-            }
-        }
-    }
-
-
-    public class CoreAudioDeviceManagerFactory : IAudioDeviceManagerFactory
-    {
-        public IAudioDeviceManager Create()
-        {
-            return new CoreAudioDeviceManager();
-        }
-    }
-}

Windows/MassiveKnob/Hardware/IAudioDeviceManager.cs

@@ -1,27 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-
-namespace MassiveKnob.Hardware
-{
-    public interface IAudioDevice
-    {
-        Guid Id { get; }
-        string DisplayName { get; }
-
-        Task SetVolume(int volume);
-    }
-    
-    
-    public interface IAudioDeviceManager : IDisposable
-    {
-        Task<IEnumerable<IAudioDevice>> GetDevices();
-        Task<IAudioDevice> GetDeviceById(Guid deviceId);
-    }
-
-
-    public interface IAudioDeviceManagerFactory
-    {
-        IAudioDeviceManager Create();
-    }
-}

Windows/MassiveKnob/Hardware/IMassiveKnobHardware.cs

@@ -1,31 +0,0 @@
-using System.Threading.Tasks;
-
-namespace MassiveKnob.Hardware
-{
-    public interface IMassiveKnobHardwareObserver
-    {
-        void Connecting();
-        void Connected(int knobCount);
-        void Disconnected();
-
-        void VolumeChanged(int knob, int volume);
-        // void ButtonPress(int index); -- for switching the active device, TBD
-    }
-
-
-    public interface IMassiveKnobHardware
-    {
-        void AttachObserver(IMassiveKnobHardwareObserver observer);
-        void DetachObserver(IMassiveKnobHardwareObserver observer);
-
-        Task TryConnect();
-        Task Disconnect();
-        // Task SetActiveKnob(int knob); -- for providing LED feedback when switching the active device, TBD
-    }
-
-
-    public interface IMassiveKnobHardwareFactory
-    {
-        IMassiveKnobHardware Create(string portName);
-    }
-}

Windows/MassiveKnob/Hardware/MockMassiveKnobHardware.cs

@@ -1,71 +0,0 @@
-using System;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace MassiveKnob.Hardware
-{
-    public class MockMassiveKnobHardware : AbstractMassiveKnobHardware
-    {
-        private readonly int knobCount;
-        private readonly TimeSpan volumeChangeInterval;
-        private readonly int maxVolume;
-        private Timer changeVolumeTimer;
-        private readonly Random random = new Random();
-
-        
-        public MockMassiveKnobHardware(int knobCount, TimeSpan volumeChangeInterval, int maxVolume)
-        {
-            this.knobCount = knobCount;
-            this.volumeChangeInterval = volumeChangeInterval;
-            this.maxVolume = maxVolume;
-        }
-        
-        
-        public override async Task TryConnect()
-        {
-            if (changeVolumeTimer != null)
-                return;
-            
-            await Task.Delay(2000);
-            
-            Observers.Connected(knobCount);
-            changeVolumeTimer = new Timer(
-                state =>
-                {
-                    Observers.VolumeChanged(random.Next(0, knobCount), random.Next(0, maxVolume));
-                },
-                null,
-                volumeChangeInterval,
-                volumeChangeInterval);
-        }
-        
-
-        public override Task Disconnect()
-        {
-            changeVolumeTimer?.Dispose();
-            return Task.CompletedTask;
-        }
-    }
-    
-    
-    // ReSharper disable once UnusedMember.Global - for testing purposes only
-    public class MockMassiveKnobHardwareFactory : IMassiveKnobHardwareFactory
-    {
-        private readonly int knobCount;
-        private readonly TimeSpan volumeChangeInterval;
-        private readonly int maxVolume;
-
-        public MockMassiveKnobHardwareFactory(int knobCount, TimeSpan volumeChangeInterval, int maxVolume)
-        {
-            this.knobCount = knobCount;
-            this.volumeChangeInterval = volumeChangeInterval;
-            this.maxVolume = maxVolume;
-        }
-        
-        
-        public IMassiveKnobHardware Create(string portName)
-        {
-            return new MockMassiveKnobHardware(knobCount, volumeChangeInterval, maxVolume);
-        }
-    }
-}

Windows/MassiveKnob/Hardware/SerialMassiveKnobHardware.cs

@@ -1,180 +0,0 @@
-using System.Diagnostics;
-using System.IO.Ports;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace MassiveKnob.Hardware
-{
-    public class SerialMassiveKnobHardware : AbstractMassiveKnobHardware
-    {
-        private readonly string portName;
-        private Thread workerThread;
-        
-        private readonly CancellationTokenSource workerThreadCancellation = new CancellationTokenSource();
-        private readonly TaskCompletionSource<bool> workerThreadCompleted = new TaskCompletionSource<bool>();
-             
-
-        public SerialMassiveKnobHardware(string portName)
-        {
-            this.portName = portName;
-        }
-
-
-        public override async Task TryConnect()
-        {
-            if (workerThread != null)
-                await Disconnect();
-
-            workerThread = new Thread(RunWorker)
-            {
-                Name = "SerialMassiveKnobHardware Worker"
-            };
-            workerThread.Start();
-        }
-
-        
-        public override async Task Disconnect()
-        {
-            workerThreadCancellation.Cancel();
-            await workerThreadCompleted.Task;
-
-            workerThread = null;
-        }
-
-
-        private void RunWorker()
-        {
-            Observers.Connecting();
-            
-            while (!workerThreadCancellation.IsCancellationRequested)
-            {
-                SerialPort serialPort = null;
-
-                void SafeCloseSerialPort()
-                {
-                    try
-                    {
-                        serialPort?.Dispose();
-                    }
-                    catch
-                    {
-                        // ignroed
-                    }
-
-                    serialPort = null;
-                    Observers.Disconnected();
-                    Observers.Connecting();
-                }
-                
-                
-                var knobCount = 0;
-
-                while (serialPort == null && !workerThreadCancellation.IsCancellationRequested)
-                {
-                    try
-                    {
-                        serialPort = new SerialPort(portName, 115200);
-                        serialPort.Open();
-
-                        // Send handshake
-                        serialPort.Write(new[] { 'H', 'M', 'K', 'B' }, 0, 4);
-
-                        // Wait for reply
-                        serialPort.ReadTimeout = 1000;
-                        var response = serialPort.ReadByte();
-
-                        if ((char) response == 'H')
-                        {
-                            knobCount = serialPort.ReadByte();
-                            if (knobCount > -1)
-                                break;
-                        }
-
-                        SafeCloseSerialPort();
-                        Thread.Sleep(500);
-                    }
-                    catch
-                    {
-                        SafeCloseSerialPort();
-                        Thread.Sleep(500);
-                    }
-                }
-
-                if (workerThreadCancellation.IsCancellationRequested)
-                {
-                    SafeCloseSerialPort();
-                    break;
-                }
-
-                var processingMessage = false;
-
-                Debug.Assert(serialPort != null, nameof(serialPort) + " != null");
-                serialPort.DataReceived += (sender, args) =>
-                {
-                    if (args.EventType != SerialData.Chars || processingMessage)
-                        return;
-
-                    var senderPort = (SerialPort) sender;
-                    processingMessage = true;
-                    try
-                    {
-                        var message = (char) senderPort.ReadByte();
-                        ProcessMessage(senderPort, message);
-                    }
-                    finally
-                    {
-                        processingMessage = false;
-                    }
-                };
-
-
-                Observers.Connected(knobCount);
-                try
-                {
-                    // This is where sending data to the hardware would be implemented
-                    while (serialPort.IsOpen && !workerThreadCancellation.IsCancellationRequested)
-                    {
-                        Thread.Sleep(10);
-                    }
-                }
-                catch
-                {
-                    // ignored
-                }
-
-                Observers.Disconnected();
-                SafeCloseSerialPort();
-                
-                if (!workerThreadCancellation.IsCancellationRequested)
-                    Thread.Sleep(500);
-            }
-
-            workerThreadCompleted.TrySetResult(true);
-        }
-        
-        
-        private void ProcessMessage(SerialPort serialPort, char message)
-        {
-            switch (message)
-            {
-                case 'V':
-                    var knobIndex = (byte)serialPort.ReadByte();
-                    var volume = (byte)serialPort.ReadByte();
-                    
-                    if (knobIndex < 255 && volume <= 100)
-                        Observers.VolumeChanged(knobIndex, volume);
-                    
-                    break;
-            }
-        }
-    }
-
-
-    public class SerialMassiveKnobHardwareFactory : IMassiveKnobHardwareFactory
-    {
-        public IMassiveKnobHardware Create(string portName)
-        {
-            return new SerialMassiveKnobHardware(portName);
-        }
-    }
-}

Windows/MassiveKnob/Helpers/ComboBoxTemplateSelector.cs

@@ -24,7 +24,7 @@ namespace MassiveKnob.Helpers
                 itemToCheck = VisualTreeHelper.GetParent(itemToCheck);
 
             // If you stopped at a ComboBoxItem, you're in the dropdown
-            var inDropDown = (itemToCheck is ComboBoxItem);
+            var inDropDown = itemToCheck is ComboBoxItem;
 
             return inDropDown
                 ? DropdownItemsTemplate ?? DropdownItemsTemplateSelector?.SelectTemplate(item, container)
@@ -33,6 +33,7 @@ namespace MassiveKnob.Helpers
     }
 
 
+    // ReSharper disable once UnusedMember.Global - used in XAML
     public class ComboBoxTemplateSelectorExtension : MarkupExtension
     {
         public DataTemplate SelectedItemTemplate { get; set; }
@@ -42,7 +43,7 @@ namespace MassiveKnob.Helpers
 
         public override object ProvideValue(IServiceProvider serviceProvider)
         {
-            return new ComboBoxTemplateSelector()
+            return new ComboBoxTemplateSelector
             {
                 SelectedItemTemplate = SelectedItemTemplate,
                 SelectedItemTemplateSelector = SelectedItemTemplateSelector,

Windows/MassiveKnob/Helpers/DelegateCommand.cs

@@ -1,4 +1,5 @@
-using System;
+/*
+using System;
 using System.Windows.Input;
 
 namespace MassiveKnob.Helpers
@@ -78,3 +79,4 @@ namespace MassiveKnob.Helpers
         }
     }
 }
+*/

Windows/MassiveKnob/Helpers/SerialQueue.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Threading.Tasks;
+
+// Original source: https://github.com/Gentlee/SerialQueue
+// ReSharper disable UnusedMember.Global - public API
+
+namespace MassiveKnob.Helpers
+{
+    public class SerialQueue
+    {
+        private readonly object locker = new object();
+        private readonly WeakReference<Task> lastTaskWeakRef = new WeakReference<Task>(null);
+
+        public Task Enqueue(Action action)
+        {
+            return Enqueue(() =>
+            {
+                action();
+                return true;
+            });
+        }
+
+        public Task<T> Enqueue<T>(Func<T> function)
+        {
+            lock (locker)
+            {
+                var resultTask = lastTaskWeakRef.TryGetTarget(out var lastTask) 
+                    ? lastTask.ContinueWith(_ => function(), TaskContinuationOptions.ExecuteSynchronously) 
+                    : Task.Run(function);
+
+                lastTaskWeakRef.SetTarget(resultTask);
+
+                return resultTask;
+            }
+        }
+
+        public Task Enqueue(Func<Task> asyncAction)
+        {
+            lock (locker)
+            {
+                var resultTask = lastTaskWeakRef.TryGetTarget(out var lastTask) 
+                    ? lastTask.ContinueWith(_ => asyncAction(), TaskContinuationOptions.ExecuteSynchronously).Unwrap() 
+                    : Task.Run(asyncAction);
+
+                lastTaskWeakRef.SetTarget(resultTask);
+
+                return resultTask;
+            }
+        }
+
+        public Task<T> Enqueue<T>(Func<Task<T>> asyncFunction)
+        {
+            lock (locker)
+            {
+                var resultTask = lastTaskWeakRef.TryGetTarget(out var lastTask) 
+                    ? lastTask.ContinueWith(_ => asyncFunction(), TaskContinuationOptions.ExecuteSynchronously).Unwrap() 
+                    : Task.Run(asyncFunction);
+
+                lastTaskWeakRef.SetTarget(resultTask);
+
+                return resultTask;
+            }
+        }
+    }
+}

Windows/MassiveKnob/MassiveKnob.csproj

@@ -58,19 +58,20 @@
     <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="Hardware\AbstractMassiveKnobHardware.cs" />
-    <Compile Include="Hardware\CoreAudioDeviceManager.cs" />
-    <Compile Include="Hardware\IAudioDeviceManager.cs" />
-    <Compile Include="Hardware\IMassiveKnobHardware.cs" />
-    <Compile Include="Hardware\MockMassiveKnobHardware.cs" />
-    <Compile Include="Hardware\SerialMassiveKnobHardware.cs" />
     <Compile Include="Helpers\ComboBoxTemplateSelector.cs" />
     <Compile Include="Helpers\DelegateCommand.cs" />
+    <Compile Include="Helpers\SerialQueue.cs" />
     <Compile Include="Model\IMassiveKnobOrchestrator.cs" />
     <Compile Include="Model\IPluginManager.cs" />
     <Compile Include="Model\MassiveKnobOrchestrator.cs" />
     <Compile Include="Model\PluginManager.cs" />
+    <Compile Include="ViewModel\ActionViewModel.cs" />
+    <Compile Include="ViewModel\DeviceViewModel.cs" />
+    <Compile Include="ViewModel\InputOutputViewModel.cs" />
     <Compile Include="ViewModel\SettingsViewModel.cs" />
+    <Compile Include="View\InputOutputView.xaml.cs">
+      <DependentUpon>InputOutputView.xaml</DependentUpon>
+    </Compile>
     <Compile Include="View\SettingsWindow.xaml.cs">
       <DependentUpon>SettingsWindow.xaml</DependentUpon>
     </Compile>
@@ -116,6 +117,9 @@
     <PackageReference Include="SimpleInjector">
       <Version>5.2.1</Version>
     </PackageReference>
+    <PackageReference Include="System.Reactive">
+      <Version>5.0.0</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <Content Include="MainIcon.ico" />
@@ -136,6 +140,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="View\InputOutputView.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="View\SettingsWindow.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>

Windows/MassiveKnob/Model/IMassiveKnobOrchestrator.cs

@@ -1,11 +1,44 @@
-using MassiveKnob.Plugin;
+using System;
+using MassiveKnob.Plugin;
 
 namespace MassiveKnob.Model
 {
-    public interface IMassiveKnobOrchestrator
+    public interface IMassiveKnobOrchestrator : IDisposable
     {
-        IMassiveKnobDeviceInstance ActiveDeviceInstance { get; }
+        MassiveKnobDeviceInfo ActiveDevice { get; }
+        IObservable<MassiveKnobDeviceInfo> ActiveDeviceSubject { get; }
 
-        IMassiveKnobDeviceInstance SetActiveDevice(IMassiveKnobDevice device);
+        MassiveKnobDeviceInfo SetActiveDevice(IMassiveKnobDevice device);
+
+        MassiveKnobActionInfo GetAction(MassiveKnobActionType actionType, int index);
+        MassiveKnobActionInfo SetAction(MassiveKnobActionType actionType, int index, IMassiveKnobAction action);
+    }
+    
+    
+    public class MassiveKnobDeviceInfo 
+    {
+        public IMassiveKnobDevice Info { get; }
+        public IMassiveKnobDeviceInstance Instance { get; }
+        public DeviceSpecs? Specs { get; }
+
+        public MassiveKnobDeviceInfo(IMassiveKnobDevice info, IMassiveKnobDeviceInstance instance, DeviceSpecs? specs)
+        {
+            Info = info;
+            Instance = instance;
+            Specs = specs;
+        }
+    }
+
+
+    public class MassiveKnobActionInfo
+    {
+        public IMassiveKnobAction Info { get; }
+        public IMassiveKnobActionInstance Instance { get; }
+
+        public MassiveKnobActionInfo(IMassiveKnobAction info, IMassiveKnobActionInstance instance)
+        {
+            Info = info;
+            Instance = instance;
+        }
     }
 }

Windows/MassiveKnob/Model/IPluginManager.cs

@@ -5,8 +5,7 @@ namespace MassiveKnob.Model
 {
     public interface IPluginManager
     {
-        IEnumerable<IMassiveKnobPlugin> Plugins { get; }
-
         IEnumerable<IMassiveKnobDevicePlugin> GetDevicePlugins();
+        IEnumerable<IMassiveKnobActionPlugin> GetActionPlugins();
     }
 }

Windows/MassiveKnob/Model/MassiveKnobOrchestrator.cs

@@ -1,51 +1,548 @@
-using MassiveKnob.Plugin;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reactive.Subjects;
+using MassiveKnob.Helpers;
+using MassiveKnob.Plugin;
+using MassiveKnob.Settings;
+using Newtonsoft.Json.Linq;
 
 namespace MassiveKnob.Model
 {
     public class MassiveKnobOrchestrator : IMassiveKnobOrchestrator
     {
-        private readonly Settings.Settings settings;
+        private readonly IPluginManager pluginManager;
+
+        private readonly object settingsLock = new object();
+        private Settings.Settings settings;
+        private readonly SerialQueue flushSettingsQueue = new SerialQueue();
+
+        private MassiveKnobDeviceInfo activeDevice;
+        private readonly Subject<MassiveKnobDeviceInfo> activeDeviceInfoSubject = new Subject<MassiveKnobDeviceInfo>();
+        private IMassiveKnobDeviceContext activeDeviceContext;
+
+        private readonly List<ActionMapping> analogInputs = new List<ActionMapping>();
+        private readonly List<ActionMapping> digitalInputs = new List<ActionMapping>();
+        private readonly List<ActionMapping> analogOutputs = new List<ActionMapping>();
+        private readonly List<ActionMapping> digitalOutputs = new List<ActionMapping>();
 
 
-        public IMassiveKnobDeviceInstance ActiveDeviceInstance { get; private set; }
+        public MassiveKnobDeviceInfo ActiveDevice
-
-
-        public MassiveKnobOrchestrator(Settings.Settings settings)
         {
-            this.settings = settings;
+            get => activeDevice;
-        }
+            private set
-        
-
-        public IMassiveKnobDeviceInstance SetActiveDevice(IMassiveKnobDevice device)
-        {
-            ActiveDeviceInstance?.Dispose();
-            ActiveDeviceInstance = device?.Create(new Context(settings));
-            
-            return ActiveDeviceInstance;
-        }
-
-
-
-        public class Context : IMassiveKnobContext
-        {
-            private readonly Settings.Settings settings;
-            
-
-            public Context(Settings.Settings settings)
             {
-                this.settings = settings;
+                if (value == activeDevice)
+                    return;
+
+                activeDevice = value;
+                activeDeviceInfoSubject.OnNext(activeDevice);
+            }
+        }
+
+        public IObservable<MassiveKnobDeviceInfo> ActiveDeviceSubject => activeDeviceInfoSubject;
+
+
+        public MassiveKnobOrchestrator(IPluginManager pluginManager)
+        {
+            this.pluginManager = pluginManager;
+        }
+
+
+        public void Dispose()
+        {
+            activeDevice?.Instance?.Dispose();
+
+            void DisposeMappings(IEnumerable<ActionMapping> mappings)
+            {
+                foreach (var mapping in mappings)
+                    mapping?.ActionInfo.Instance?.Dispose();
+            }
+            
+            
+            DisposeMappings(analogInputs);
+            DisposeMappings(digitalInputs);
+            DisposeMappings(analogOutputs);
+            DisposeMappings(digitalOutputs);
+
+            activeDeviceInfoSubject?.Dispose();
+        }
+
+
+        public void Load()
+        {
+            lock (settingsLock)
+            {
+                settings = SettingsJsonSerializer.Deserialize();
+
+                if (settings.Device == null)
+                    return;
+
+                var allDevices = pluginManager.GetDevicePlugins().SelectMany(dp => dp.Devices);
+                var device = allDevices.FirstOrDefault(d => d.DeviceId == settings.Device.DeviceId);
+                
+                InternalSetActiveDevice(device, false);
+            }
+        }
+
+
+        MassiveKnobDeviceInfo IMassiveKnobOrchestrator.ActiveDevice => activeDevice;
+
+        public MassiveKnobDeviceInfo SetActiveDevice(IMassiveKnobDevice device)
+        {
+            return InternalSetActiveDevice(device, true);
+        }
+
+        
+        public MassiveKnobActionInfo GetAction(MassiveKnobActionType actionType, int index)
+        {
+            var list = GetActionMappingList(actionType);
+            return index >= list.Count ? null : list[index].ActionInfo;
+        }
+
+        
+        public MassiveKnobActionInfo SetAction(MassiveKnobActionType actionType, int index, IMassiveKnobAction action)
+        {
+            var list = GetActionMappingList(actionType);
+            if (index >= list.Count)
+                return null;
+
+            if (list[index]?.ActionInfo.Info == action)
+                return list[index].ActionInfo;
+            
+            list[index]?.ActionInfo.Instance?.Dispose();
+
+            lock (settingsLock)
+            {
+                var settingsList = GetActionSettingsList(actionType);
+                while (index >= settingsList.Count)
+                    settingsList.Add(null);
+
+                settingsList[index] = action == null ? null : new Settings.Settings.ActionSettings
+                {
+                    ActionId = action.ActionId,
+                    Settings = null
+                };
+            }
+            
+            FlushSettings();
+
+
+            Action initializeAfterRegistration = null;
+            var mapping = CreateActionMapping(action, index, (actionInstance, actionContext) =>
+            {
+                initializeAfterRegistration = () => actionInstance.Initialize(actionContext);
+            });
+
+            list[index] = mapping;
+            initializeAfterRegistration?.Invoke();
+
+            return mapping?.ActionInfo;
+        }
+
+
+        private MassiveKnobDeviceInfo InternalSetActiveDevice(IMassiveKnobDevice device, bool resetSettings)
+        {
+            if (device == ActiveDevice?.Info)
+                return ActiveDevice;
+
+
+            if (resetSettings)
+            {
+                lock (settingsLock)
+                {
+                    if (device == null)
+                        settings.Device = null;
+                    else
+                    {
+                        settings.Device = new Settings.Settings.DeviceSettings
+                        {
+                            DeviceId = device.DeviceId,
+                            Settings = null
+                        };
+                    }
+                }
+                
+                FlushSettings();
+            }
+
+            ActiveDevice?.Instance.Dispose();
+
+            if (device != null)
+            {
+                var instance = device.Create();
+                ActiveDevice = new MassiveKnobDeviceInfo(device, instance, null);
+
+                activeDeviceContext = new DeviceContext(this, device);
+                instance.Initialize(activeDeviceContext);
+            }
+            else
+            {
+                ActiveDevice = null;
+                activeDeviceContext = null;
+            }
+
+            return ActiveDevice;
+        }
+
+
+        protected T GetDeviceSettings<T>(IMassiveKnobDeviceContext context) where T : class, new()
+        {
+            if (context != activeDeviceContext)
+                throw new InvalidOperationException("Caller must be the active device to retrieve the settings");
+
+            lock (settingsLock)
+            {
+                return settings.Device.Settings?.ToObject<T>() ?? new T();
+            }
+        }
+
+
+        protected void SetDeviceSettings<T>(IMassiveKnobDeviceContext context, IMassiveKnobDevice device, T deviceSettings) where T : class, new()
+        {
+            if (context != activeDeviceContext)
+                throw new InvalidOperationException("Caller must be the active device to update the settings");
+
+            lock (settingsLock)
+            {
+                if (settings.Device == null)
+                    settings.Device = new Settings.Settings.DeviceSettings
+                    {
+                        DeviceId = device.DeviceId
+                    };
+
+                settings.Device.Settings = JObject.FromObject(deviceSettings);
+            }
+
+            FlushSettings();
+        }
+
+
+        protected T GetActionSettings<T>(IMassiveKnobActionContext context, IMassiveKnobAction action, int index) where T : class, new()
+        {
+            var list = GetActionMappingList(action.ActionType);
+            if (index >= list.Count)
+                return new T();
+            
+            if (list[index]?.Context != context)
+                throw new InvalidOperationException("Caller must be the active action to retrieve the settings");
+
+            lock (settingsLock)
+            {
+                var settingsList = GetActionSettingsList(action.ActionType);
+                if (index >= settingsList.Count)
+                    return new T();
+
+                return settingsList[index].Settings?.ToObject<T>() ?? new T();
+            }    
+        }
+
+
+        protected void SetActionSettings<T>(IMassiveKnobActionContext context, IMassiveKnobAction action, int index, T actionSettings) where T : class, new()
+        {
+            var list = GetActionMappingList(action.ActionType);
+            if (index >= list.Count)
+                return;
+
+            if (list[index].Context != context)
+                throw new InvalidOperationException("Caller must be the active action to retrieve the settings");
+
+            lock (settingsLock)
+            {
+                var settingsList = GetActionSettingsList(action.ActionType);
+                
+                while (index >= settingsList.Count)
+                    settingsList.Add(null);
+
+                if (settingsList[index] == null)
+                    settingsList[index] = new Settings.Settings.ActionSettings
+                    {
+                        ActionId = action.ActionId
+                    };
+
+                settingsList[index].Settings = JObject.FromObject(actionSettings);
+            }
+            
+            FlushSettings();
+        }
+
+
+        protected void AnalogChanged(IMassiveKnobDeviceContext context, int analogInputIndex, byte value)
+        {
+            if (context != activeDeviceContext)
+                return;
+
+            var mapping = GetActionMappingList(MassiveKnobActionType.InputAnalog);
+            if (mapping == null || analogInputIndex >= mapping.Count)
+                return;
+
+            if (mapping[analogInputIndex].ActionInfo.Instance is IMassiveKnobAnalogAction analogAction)
+                analogAction.AnalogChanged(value);
+        }
+
+
+        protected void DigitalChanged(IMassiveKnobDeviceContext context, int digitalInputIndex, bool on)
+        {
+            if (context != activeDeviceContext)
+                return;
+
+            var mapping = GetActionMappingList(MassiveKnobActionType.InputAnalog);
+            if (mapping == null || digitalInputIndex >= mapping.Count)
+                return;
+
+            if (mapping[digitalInputIndex].ActionInfo.Instance is IMassiveKnobDigitalAction digitalAction)
+                digitalAction.DigitalChanged(on);
+        }
+
+
+        private List<ActionMapping> GetActionMappingList(MassiveKnobActionType actionType)
+        {
+            switch (actionType)
+            {
+                case MassiveKnobActionType.InputAnalog:
+                    return analogInputs;
+                
+                case MassiveKnobActionType.InputDigital:
+                    return digitalInputs;
+                
+                case MassiveKnobActionType.OutputAnalog:
+                    return analogOutputs;
+                
+                case MassiveKnobActionType.OutputDigital:
+                    return digitalOutputs;
+                
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(actionType), actionType, null);
+            }
+        }
+
+        
+        private List<Settings.Settings.ActionSettings> GetActionSettingsList(MassiveKnobActionType actionType)
+        {
+            switch (actionType)
+            {
+                case MassiveKnobActionType.InputAnalog:
+                    return settings.AnalogInput;
+
+                case MassiveKnobActionType.InputDigital:
+                    return settings.DigitalInput;
+
+                case MassiveKnobActionType.OutputAnalog:
+                    return settings.AnalogOutput;
+
+                case MassiveKnobActionType.OutputDigital:
+                    return settings.DigitalOutput;
+
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(actionType), actionType, null);
+            }
+        }
+
+        private void FlushSettings()
+        {
+            Settings.Settings settingsSnapshot;
+            
+            lock (settingsLock)
+            { 
+                settingsSnapshot = settings.Clone();
+            }
+            
+            flushSettingsQueue.Enqueue(async () =>
+            {
+                await SettingsJsonSerializer.Serialize(settingsSnapshot);
+            });
+        }
+
+
+        protected void UpdateActiveDeviceSpecs(IMassiveKnobDeviceContext context, DeviceSpecs specs)
+        {
+            if (context != activeDeviceContext)
+                return;
+
+            
+            var delayedInitializeActions = new List<Action>();
+            void DelayedInitialize(IMassiveKnobActionInstance instance, IMassiveKnobActionContext instanceContext)
+            {
+                delayedInitializeActions.Add(() =>
+                {
+                    instance.Initialize(instanceContext);
+                });
+            }
+            
+            lock (settingsLock)
+            {
+                UpdateMapping(analogInputs, specs.AnalogInputCount, settings.AnalogInput, DelayedInitialize);
+                UpdateMapping(digitalInputs, specs.DigitalInputCount, settings.DigitalInput, DelayedInitialize);
+                UpdateMapping(analogOutputs, specs.AnalogOutputCount, settings.AnalogOutput, DelayedInitialize);
+                UpdateMapping(digitalOutputs, specs.DigitalOutputCount, settings.DigitalOutput, DelayedInitialize);
+            }
+
+            foreach (var delayedInitializeAction in delayedInitializeActions)
+                delayedInitializeAction();
+
+
+            ActiveDevice = new MassiveKnobDeviceInfo(
+                ActiveDevice.Info,
+                ActiveDevice.Instance,
+                specs);
+        }
+
+
+        private void UpdateMapping(List<ActionMapping> mapping, int newCount, List<Settings.Settings.ActionSettings> actionSettings, Action<IMassiveKnobActionInstance, IMassiveKnobActionContext> initializeOutsideLock)
+        {
+            if (mapping.Count > newCount)
+            {
+                for (var actionIndex = newCount; actionIndex < mapping.Count; actionIndex++)
+                    mapping[actionIndex]?.ActionInfo.Instance?.Dispose();
+
+                mapping.RemoveRange(newCount, mapping.Count - newCount);
+            }
+
+            if (actionSettings.Count > newCount)
+                actionSettings.RemoveRange(newCount, actionSettings.Count - newCount);
+
+
+            if (mapping.Count >= newCount) return;
+            {
+                var allActions = pluginManager.GetActionPlugins().SelectMany(ap => ap.Actions).ToArray();
+                
+                for (var actionIndex = mapping.Count; actionIndex < newCount; actionIndex++)
+                {
+                    if (actionIndex < actionSettings.Count && actionSettings[actionIndex] != null)
+                    {
+                        var action = allActions.FirstOrDefault(d => d.ActionId == actionSettings[actionIndex].ActionId);
+                        mapping.Add(CreateActionMapping(action, actionIndex, initializeOutsideLock));
+                    }
+                    else
+                        mapping.Add(null);
+                }
+            }
+        }
+
+
+        private ActionMapping CreateActionMapping(IMassiveKnobAction action, int index, Action<IMassiveKnobActionInstance, IMassiveKnobActionContext> initialize)
+        {
+            if (action == null)
+                return null;
+            
+            var instance = action.Create();
+            var context = new ActionContext(this, action, index);
+
+            var mapping = new ActionMapping(new MassiveKnobActionInfo(action, instance), context);
+            initialize(instance, context);
+
+            return mapping;
+        }
+
+
+        private class ActionMapping
+        {
+            public MassiveKnobActionInfo ActionInfo { get; }
+            public IMassiveKnobActionContext Context { get; }
+
+            
+            public ActionMapping(MassiveKnobActionInfo actionInfo, IMassiveKnobActionContext context)
+            {
+                ActionInfo = actionInfo;
+                Context = context;
+            }
+        }
+
+
+        private class DeviceContext : IMassiveKnobDeviceContext
+        {
+            private readonly MassiveKnobOrchestrator owner;
+            private readonly IMassiveKnobDevice device;
+
+
+            public DeviceContext(MassiveKnobOrchestrator owner, IMassiveKnobDevice device)
+            {
+                this.owner = owner;
+                this.device = device;
             }
                     
+            
             public T GetSettings<T>() where T : class, new()
             {
-                // TODO
+                return owner.GetDeviceSettings<T>(this);
-                return default;
+            }
+            
+            
+            public void SetSettings<T>(T settings) where T : class, new()
+            {
+                owner.SetDeviceSettings(this, device, settings);
+            }
+
+            
+            public void Connecting()
+            {
+                // TODO update status ?
+            }
+
+
+            public void Connected(DeviceSpecs specs)
+            {
+                // TODO update status ?
+
+                owner.UpdateActiveDeviceSpecs(this, specs);
+            }
+
+
+            public void Disconnected()
+            {
+                // TODO update status ?
+            }
+
+
+            public void AnalogChanged(int analogInputIndex, byte value)
+            {
+                owner.AnalogChanged(this, analogInputIndex, value);
+            }
+
+            
+            public void DigitalChanged(int digitalInputIndex, bool on)
+            {
+                owner.DigitalChanged(this, digitalInputIndex, on);
+            }
+        }
+
+
+        private class ActionContext : IMassiveKnobActionContext
+        {
+            private readonly MassiveKnobOrchestrator owner;
+            private readonly IMassiveKnobAction action;
+            private readonly int index;
+
+
+            public ActionContext(MassiveKnobOrchestrator owner, IMassiveKnobAction action, int index)
+            {
+                this.owner = owner;
+                this.action = action;
+                this.index = index;
+            }
+
+            
+            public T GetSettings<T>() where T : class, new()
+            {
+                return owner.GetActionSettings<T>(this, action, index);
+            }
+
+            
+            public void SetSettings<T>(T settings) where T : class, new()
+            {
+                owner.SetActionSettings(this, action, index, settings);
+            }
+
+            
+            public void SetDigitalOutput(bool on)
+            {
+                throw new NotImplementedException();
             }
             
 
-            public void SetSettings<T>(T settings) where T : class, new()
+            public void SetAnalogOutput(byte value)
             {
-                // TODO
+                throw new NotImplementedException();
             }
         }
     }

Windows/MassiveKnob/Model/PluginManager.cs

@@ -7,21 +7,46 @@ using MassiveKnob.Plugin;
 
 namespace MassiveKnob.Model
 {
+    public class MassiveKnobPluginIdConflictException : Exception
+    {
+        public Guid ConflictingId { get; }
+        public string FirstAssemblyFilename { get; }
+        public string ConflictingAssemblyFilename { get; }
+
+        
+        public MassiveKnobPluginIdConflictException(
+            Guid conflictingId, 
+            string firstAssemblyFilename, 
+            string conflictingAssemblyFilename)
+            : base($"Conflicting ID {conflictingId} was already registered by {firstAssemblyFilename}.")
+        {
+            ConflictingId = conflictingId;
+            FirstAssemblyFilename = firstAssemblyFilename;
+            ConflictingAssemblyFilename = conflictingAssemblyFilename;
+        }
+    }
+    
+    
     public class PluginManager : IPluginManager
     {
         private readonly List<IMassiveKnobPlugin> plugins = new List<IMassiveKnobPlugin>();
 
 
-        public IEnumerable<IMassiveKnobPlugin> Plugins => plugins;
-
         public IEnumerable<IMassiveKnobDevicePlugin> GetDevicePlugins()
         {
             return plugins.Where(p => p is IMassiveKnobDevicePlugin).Cast<IMassiveKnobDevicePlugin>();
         }
 
-
+        public IEnumerable<IMassiveKnobActionPlugin> GetActionPlugins()
-        public void Load()
         {
+            return plugins.Where(p => p is IMassiveKnobActionPlugin).Cast<IMassiveKnobActionPlugin>();
+        }
+
+
+        public void Load(Action<Exception, string> onException)
+        {
+            var registeredIds = new RegisteredIds();
+            
             var codeBase = Assembly.GetEntryAssembly()?.CodeBase;
             if (!string.IsNullOrEmpty(codeBase))
             {
@@ -29,17 +54,17 @@ namespace MassiveKnob.Model
                 if (!string.IsNullOrEmpty(localPath))
                 {
                     var applicationPluginPath = Path.Combine(localPath, @"Plugins");
-                    LoadPlugins(applicationPluginPath);
+                    LoadPlugins(applicationPluginPath, registeredIds, onException);
                 }
             }
 
 
             var localPluginPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), @"MassiveKnob", @"Plugins");
-            LoadPlugins(localPluginPath);
+            LoadPlugins(localPluginPath, registeredIds, onException);
         }
 
 
-        private void LoadPlugins(string path)
+        private void LoadPlugins(string path, RegisteredIds registeredIds, Action<Exception, string> onException)
         {
             if (!Directory.Exists(path))
                 return;
@@ -51,19 +76,17 @@ namespace MassiveKnob.Model
                 try
                 {
                     var pluginAssembly = Assembly.LoadFrom(filename);
-                    RegisterPlugins(pluginAssembly);
+                    RegisterPlugins(filename, pluginAssembly, registeredIds);
                 }
                 catch (Exception e)
                 {
-                    // TODO report error
+                    onException(e, filename);
-//                    Console.WriteLine(e);
-                    throw;
                 }
             }
         }
 
 
-        private void RegisterPlugins(Assembly assembly)
+        private void RegisterPlugins(string filename, Assembly assembly, RegisteredIds registeredIds)
         {
             var pluginTypes = assembly.GetTypes().Where(t => t.GetCustomAttribute<MassiveKnobPluginAttribute>() != null);
             foreach (var pluginType in pluginTypes)
@@ -71,9 +94,57 @@ namespace MassiveKnob.Model
                 var pluginInstance = Activator.CreateInstance(pluginType);
                 if (!(pluginInstance is IMassiveKnobPlugin))
                     throw new InvalidCastException($"Type {pluginType.FullName} claims to be a MassiveKnobPlugin but does not implement IMassiveKnobPlugin");
-                
+
+                ValidateRegistration(filename, (IMassiveKnobPlugin)pluginInstance, registeredIds);
                 plugins.Add((IMassiveKnobPlugin)pluginInstance);
             }
         }
+
+
+        private static void ValidateRegistration(string filename, IMassiveKnobPlugin plugin, RegisteredIds registeredIds)
+        {
+            // Make sure all GUIDs are actually unique and someone has not copy/pasted a plugin without
+            // modifying the values. This way we can safely make that assumption in other code.
+            if (registeredIds.PluginById.TryGetValue(plugin.PluginId, out var conflictingPluginFilename))
+                throw new MassiveKnobPluginIdConflictException(plugin.PluginId, conflictingPluginFilename, filename);
+
+            registeredIds.PluginById.Add(plugin.PluginId, filename);
+
+            
+            // ReSharper disable once ConvertIfStatementToSwitchStatement - no, a plugin can implement both interfaces
+            if (plugin is IMassiveKnobDevicePlugin devicePlugin)
+            {
+                foreach (var device in devicePlugin.Devices)
+                {
+                    if (registeredIds.DeviceById.TryGetValue(device.DeviceId, out var conflictingDeviceFilename))
+                        throw new MassiveKnobPluginIdConflictException(device.DeviceId, conflictingDeviceFilename, filename);
+                    
+                    registeredIds.DeviceById.Add(device.DeviceId, filename);
+                }
+            }
+
+
+            // ReSharper disable once InvertIf
+            if (plugin is IMassiveKnobActionPlugin actionPlugin)
+            {
+                foreach (var action in actionPlugin.Actions)
+                {
+                    if (registeredIds.ActionById.TryGetValue(action.ActionId, out var conflictingActionFilename))
+                        throw new MassiveKnobPluginIdConflictException(action.ActionId, conflictingActionFilename, filename);
+
+                    registeredIds.ActionById.Add(action.ActionId, filename);
+                    
+                    // TODO check ActionType vs. implemented interfaces
+                }
+            }
+        }
+
+
+        private class RegisteredIds
+        {
+            public readonly Dictionary<Guid, string> PluginById = new Dictionary<Guid, string>();
+            public readonly Dictionary<Guid, string> DeviceById = new Dictionary<Guid, string>();
+            public readonly Dictionary<Guid, string> ActionById = new Dictionary<Guid, string>();
+        }
     }
 }

Windows/MassiveKnob/Program.cs

@@ -1,7 +1,7 @@
 using System;
-using System.Threading.Tasks;
+using System.Text;
+using System.Windows;
 using MassiveKnob.Model;
-using MassiveKnob.Settings;
 using MassiveKnob.View;
 using MassiveKnob.ViewModel;
 using SimpleInjector;
@@ -14,33 +14,42 @@ namespace MassiveKnob
         /// The main entry point for the application.
         /// </summary>
         [STAThread]
-        public static void Main()
+        public static int Main()
         {
-           MainAsync().GetAwaiter().GetResult();
+            var pluginManager = new PluginManager();
-        }
+
+            var messages = new StringBuilder();
+            pluginManager.Load((exception, filename) =>
+            {
+                messages.AppendLine($"{filename}: {exception.Message}");
+            });
+
+            if (messages.Length > 0)
+            {
+                MessageBox.Show($"Error while loading plugins:\r\n\r\n{messages}", "Massive Knob", MessageBoxButton.OK, MessageBoxImage.Error);
+                return 1;
+            }
+            
+            var orchestrator = new MassiveKnobOrchestrator(pluginManager);
+            orchestrator.Load();
 
 
-        private static async Task MainAsync()
-        {
             var container = new Container();
             container.Options.EnableAutoVerification = false;
 
-            container.RegisterSingleton<IMassiveKnobOrchestrator, MassiveKnobOrchestrator>();
+            container.RegisterInstance<IPluginManager>(pluginManager);
+            container.RegisterInstance<IMassiveKnobOrchestrator>(orchestrator);
 
             container.Register<App>();
             container.Register<SettingsWindow>();
             container.Register<SettingsViewModel>();
 
-            var settings = await SettingsJsonSerializer.Deserialize();
-            container.RegisterInstance(settings);
-
-            var pluginManager = new PluginManager();
-            pluginManager.Load();
-            container.RegisterInstance<IPluginManager>(pluginManager);
-
             
             var app = container.GetInstance<App>();
             app.Run();
+
+            orchestrator.Dispose();
+            return 0;
         }
     }
 }

Windows/MassiveKnob/Settings/Settings.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Newtonsoft.Json.Linq;
 
 namespace MassiveKnob.Settings
@@ -7,32 +8,67 @@ namespace MassiveKnob.Settings
     public class Settings
     {
         public DeviceSettings Device { get; set; }
-        public List<ActionSettings> Actions { get; set; }
+        public List<ActionSettings> AnalogInput { get; set; }
+        public List<ActionSettings> DigitalInput { get; set; }
+        public List<ActionSettings> AnalogOutput { get; set; }
+        public List<ActionSettings> DigitalOutput { get; set; }
+
+
+        public void Verify()
+        {
+            if (AnalogInput == null) AnalogInput = new List<ActionSettings>();
+            if (DigitalInput == null) DigitalInput = new List<ActionSettings>();
+            if (AnalogOutput == null) AnalogOutput = new List<ActionSettings>();
+            if (DigitalOutput == null) DigitalOutput = new List<ActionSettings>();
+        }
         
         
-        public static Settings Default()
+        public Settings Clone()
         {
             return new Settings
             {
-                Device = null,
+                Device = Device?.Clone(),
-                Actions = new List<ActionSettings>()
+                AnalogInput = AnalogInput.Select(a => a?.Clone()).ToList(),
+                DigitalInput = DigitalInput.Select(a => a?.Clone()).ToList(),
+                AnalogOutput = AnalogOutput.Select(a => a?.Clone()).ToList(),
+                DigitalOutput = DigitalOutput.Select(a => a?.Clone()).ToList()
             };
         }
 
 
         public class DeviceSettings
         {
-            public Guid? PluginId { get; set; }
             public Guid? DeviceId { get; set; }
             public JObject Settings { get; set; }
+            
+            public DeviceSettings Clone()
+            {
+                return new DeviceSettings
+                {
+                    DeviceId = DeviceId,
+                    
+                    // This is safe, as the JObject itself is never manipulated, only replaced
+                    Settings = Settings
+                };
+            }
         }
         
 
         public class ActionSettings
         {
-            public Guid PluginId { get; set; }
             public Guid ActionId { get; set; }
             public JObject Settings { get; set; }
+
+            public ActionSettings Clone()
+            {
+                return new ActionSettings
+                {
+                    ActionId = ActionId,
+
+                    // This is safe, as the JObject itself is never manipulated, only replaced
+                    Settings = Settings
+                };
+            }
         }
     }
 }

Windows/MassiveKnob/Settings/SettingsJsonSerializer.cs

@@ -1,13 +1,25 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
 
 namespace MassiveKnob.Settings
 {
     public static class SettingsJsonSerializer
     {
+        private static readonly JsonSerializerSettings DefaultSettings = new JsonSerializerSettings
+        {
+            Formatting = Formatting.Indented,
+            Converters = new List<JsonConverter>
+            {
+                new StringEnumConverter()
+            }
+        };
+        
+        
         public static string GetDefaultFilename()
         {
             var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), @"MassiveKnob");
@@ -24,7 +36,7 @@ namespace MassiveKnob.Settings
 
         public static async Task Serialize(Settings settings, string filename)
         {
-            var json = JsonConvert.SerializeObject(settings);
+            var json = JsonConvert.SerializeObject(settings, DefaultSettings);
 
             using (var stream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Read, 4096, true))
             using (var streamWriter = new StreamWriter(stream, Encoding.UTF8))
@@ -35,28 +47,34 @@ namespace MassiveKnob.Settings
         }
 
 
-        public static Task<Settings> Deserialize()
+        public static Settings Deserialize()
         {
             return Deserialize(GetDefaultFilename());
         }
 
-        public static async Task<Settings> Deserialize(string filename)
+        public static Settings Deserialize(string filename)
         {
-            if (!File.Exists(filename))
+            Settings settings = null;
-                return Settings.Default();
 
-            string json;
+            if (File.Exists(filename))
-
-            using (var stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, true))
-            using (var streamReader = new StreamReader(stream, Encoding.UTF8))
             {
-                json = await streamReader.ReadToEndAsync();
+                string json;
+
+                using (var stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, true))
+                using (var streamReader = new StreamReader(stream, Encoding.UTF8))
+                {
+                    json = streamReader.ReadToEnd();
+                }
+
+                if (!string.IsNullOrEmpty(json))
+                    settings = JsonConvert.DeserializeObject<Settings>(json, DefaultSettings);
             }
+            
+            if (settings == null)
+                settings = new Settings();
 
-            if (string.IsNullOrEmpty(json))
+            settings.Verify();
-                return Settings.Default();
+            return settings;
-
-            return JsonConvert.DeserializeObject<Settings>(json);
         }
     }
 }

Windows/MassiveKnob/Strings.Designer.cs

@@ -61,83 +61,11 @@ namespace MassiveKnob {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to {0}.
+        ///   Looks up a localized string similar to Not configured.
         /// </summary>
-        internal static string DeviceDisplayNameActive {
+        internal static string ActionNotConfigured {
             get {
-                return ResourceManager.GetString("DeviceDisplayNameActive", resourceCulture);
+                return ResourceManager.GetString("ActionNotConfigured", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to {0} (Disabled).
-        /// </summary>
-        internal static string DeviceDisplayNameDisabled {
-            get {
-                return ResourceManager.GetString("DeviceDisplayNameDisabled", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to {0} (Inactive).
-        /// </summary>
-        internal static string DeviceDisplayNameInactive {
-            get {
-                return ResourceManager.GetString("DeviceDisplayNameInactive", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to {0} (Not present).
-        /// </summary>
-        internal static string DeviceDisplayNameNotPresent {
-            get {
-                return ResourceManager.GetString("DeviceDisplayNameNotPresent", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to {0} (Unplugged).
-        /// </summary>
-        internal static string DeviceDisplayNameUnplugged {
-            get {
-                return ResourceManager.GetString("DeviceDisplayNameUnplugged", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to Knob {0}.
-        /// </summary>
-        internal static string KnobIndex {
-            get {
-                return ResourceManager.GetString("KnobIndex", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to Connected.
-        /// </summary>
-        internal static string StatusConnected {
-            get {
-                return ResourceManager.GetString("StatusConnected", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to Connecting....
-        /// </summary>
-        internal static string StatusConnecting {
-            get {
-                return ResourceManager.GetString("StatusConnecting", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to Not connected.
-        /// </summary>
-        internal static string StatusNotConnected {
-            get {
-                return ResourceManager.GetString("StatusNotConnected", resourceCulture);
             }
         }
     }

Windows/MassiveKnob/Strings.resx

@@ -117,31 +117,7 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
-  <data name="StatusConnected" xml:space="preserve">
+  <data name="ActionNotConfigured" xml:space="preserve">
-    <value>Connected</value>
+    <value>Not configured</value>
-  </data>
-  <data name="StatusConnecting" xml:space="preserve">
-    <value>Connecting...</value>
-  </data>
-  <data name="StatusNotConnected" xml:space="preserve">
-    <value>Not connected</value>
-  </data>
-  <data name="KnobIndex" xml:space="preserve">
-    <value>Knob {0}</value>
-  </data>
-  <data name="DeviceDisplayNameActive" xml:space="preserve">
-    <value>{0}</value>
-  </data>
-  <data name="DeviceDisplayNameDisabled" xml:space="preserve">
-    <value>{0} (Disabled)</value>
-  </data>
-  <data name="DeviceDisplayNameInactive" xml:space="preserve">
-    <value>{0} (Inactive)</value>
-  </data>
-  <data name="DeviceDisplayNameNotPresent" xml:space="preserve">
-    <value>{0} (Not present)</value>
-  </data>
-  <data name="DeviceDisplayNameUnplugged" xml:space="preserve">
-    <value>{0} (Unplugged)</value>
   </data>
 </root>

Windows/MassiveKnob/Style.xaml

@@ -1,5 +1,9 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Style TargetType="Window" x:Key="DefaultWindow">
+        <Setter Property="Background" Value="#f0f0f0" />
+    </Style>
+
     <Style TargetType="MenuItem" x:Key="DefaultMenuItem">
         <Setter Property="FontWeight" Value="Bold" />
     </Style>
@@ -12,10 +16,21 @@
         <Setter Property="Padding" Value="5" />
     </Style>
 
+    <Style TargetType="TextBlock" x:Key="SubHeader">
+        <Setter Property="Background" Value="LightSlateGray" />
+        <Setter Property="Foreground" Value="White" />
+        <Setter Property="FontSize" Value="14" />
+        <Setter Property="Padding" Value="5" />
+    </Style>
+
     <Style TargetType="StackPanel" x:Key="Content">
         <Setter Property="Margin" Value="8" />
     </Style>
 
+    <Style TargetType="ContentControl" x:Key="SettingsControl">
+        <Setter Property="Margin" Value="0,8,0,0"></Setter>
+    </Style>
+
     <Style TargetType="TextBlock" x:Key="ComboBoxDescription">
         <Setter Property="Foreground" Value="{x:Static SystemColors.GrayTextBrush}" />
     </Style>

Windows/MassiveKnob/View/InputOutputView.xaml

@@ -0,0 +1,44 @@
+<UserControl x:Class="MassiveKnob.View.InputOutputView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:helpers="clr-namespace:MassiveKnob.Helpers"
+             xmlns:viewModel="clr-namespace:MassiveKnob.ViewModel"
+             mc:Ignorable="d" 
+             d:DesignHeight="100" d:DesignWidth="800"
+             d:DataContext="{d:DesignInstance viewModel:InputOutputViewModel}">
+    <UserControl.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="../Style.xaml"></ResourceDictionary>
+            </ResourceDictionary.MergedDictionaries>
+
+            <DataTemplate x:Key="ActionDropdownItem">
+                <StackPanel Orientation="Vertical" d:DataContext="{d:DesignInstance Type=viewModel:ActionViewModel}">
+                    <TextBlock Text="{Binding Name}" />
+                    <TextBlock Text="{Binding Description}" Style="{StaticResource ComboBoxDescription}" Visibility="{Binding DescriptionVisibility}" />
+                </StackPanel>
+            </DataTemplate>
+
+            <DataTemplate x:Key="ActionSelectedItem">
+                <TextBlock Text="{Binding Name}" d:DataContext="{d:DesignInstance Type=viewModel:ActionViewModel}" />
+            </DataTemplate>
+        </ResourceDictionary>
+    </UserControl.Resources>
+    <StackPanel Orientation="Vertical">
+        <TextBlock Text="{Binding DisplayName}" Style="{StaticResource SubHeader}"></TextBlock>
+
+        <StackPanel Orientation="Vertical" Style="{StaticResource Content}">
+            <ComboBox 
+                ItemsSource="{Binding Actions}" 
+                SelectedItem="{Binding SelectedAction}" 
+                IsSynchronizedWithCurrentItem="False" 
+                ItemTemplateSelector="{helpers:ComboBoxTemplateSelector 
+                                        SelectedItemTemplate={StaticResource ActionSelectedItem},
+                                        DropdownItemsTemplate={StaticResource ActionDropdownItem}}" />
+
+            <ContentControl Focusable="False" Content="{Binding ActionSettingsControl}" Style="{StaticResource SettingsControl}" />
+        </StackPanel>
+    </StackPanel>
+</UserControl>

Windows/MassiveKnob/View/InputOutputView.xaml.cs

@@ -0,0 +1,13 @@
+namespace MassiveKnob.View
+{
+    /// <summary>
+    /// Interaction logic for InputOutputView.xaml
+    /// </summary>
+    public partial class InputOutputView
+    {
+        public InputOutputView()
+        {
+            InitializeComponent();
+        }
+    }
+}

Windows/MassiveKnob/View/SettingsWindow.xaml

@@ -4,9 +4,13 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:helpers="clr-namespace:MassiveKnob.Helpers"
+        xmlns:viewModel="clr-namespace:MassiveKnob.ViewModel"
+        xmlns:view="clr-namespace:MassiveKnob.View"
         mc:Ignorable="d"
         Title="Massive Knob - Settings" Height="555" Width="704.231"
-        WindowStartupLocation="CenterScreen">
+        WindowStartupLocation="CenterScreen"
+        Style="{StaticResource DefaultWindow}"
+        d:DataContext="{d:DesignInstance Type=viewModel:SettingsViewModel}">
     <Window.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
@@ -14,32 +18,103 @@
             </ResourceDictionary.MergedDictionaries>
 
             <DataTemplate x:Key="DeviceDropdownItem">
-                <StackPanel Orientation="Vertical">
+                <StackPanel Orientation="Vertical" d:DataContext="{d:DesignInstance Type=viewModel:DeviceViewModel}">
                     <TextBlock Text="{Binding Name}" />
-                    <TextBlock Text="{Binding Description}" Style="{StaticResource ComboBoxDescription}" />
+                    <TextBlock Text="{Binding Description}" Style="{StaticResource ComboBoxDescription}" Visibility="{Binding DescriptionVisibility}" />
                 </StackPanel>
             </DataTemplate>
 
             <DataTemplate x:Key="DeviceSelectedItem">
-                <TextBlock Text="{Binding Name}" />
+                <TextBlock Text="{Binding Name}" d:DataContext="{d:DesignInstance Type=viewModel:DeviceViewModel}" />
             </DataTemplate>
         </ResourceDictionary>
     </Window.Resources>
 
     <ScrollViewer>
         <StackPanel Orientation="Vertical">
+            <!--
+            
+                Device
+            
+            -->
             <TextBlock Style="{StaticResource Header}">Device</TextBlock>
             
             <StackPanel Orientation="Vertical" Style="{StaticResource Content}">
-                <ComboBox SelectedItem="{Binding SelectedDevice}" ItemsSource="{Binding Devices}" ItemTemplateSelector="{helpers:ComboBoxTemplateSelector 
+                <ComboBox 
-                    SelectedItemTemplate={StaticResource DeviceSelectedItem},
+                    ItemsSource="{Binding Devices}" 
-                    DropdownItemsTemplate={StaticResource DeviceDropdownItem}}" />
+                    SelectedItem="{Binding SelectedDevice}"
+                    IsSynchronizedWithCurrentItem="False" 
+                    ItemTemplateSelector="{helpers:ComboBoxTemplateSelector 
+                        SelectedItemTemplate={StaticResource DeviceSelectedItem},
+                        DropdownItemsTemplate={StaticResource DeviceDropdownItem}}" />
 
-                <ContentControl Focusable="False" Content="{Binding SettingsControl}" />
+
+                <ContentControl Focusable="False" Content="{Binding SettingsControl}" Style="{StaticResource SettingsControl}" />
             </StackPanel>
-            
 
-            <TextBlock Style="{StaticResource Header}">Controls</TextBlock>
+
+            <!--
+            
+                Analog inputs
+            
+            -->
+            <TextBlock Style="{StaticResource Header}" Visibility="{Binding AnalogInputVisibility}">Analog inputs</TextBlock>
+
+            <ItemsControl ItemsSource="{Binding AnalogInputs}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                        <view:InputOutputView />
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+
+            <!--
+            
+                Digital inputs
+            
+            -->
+            <TextBlock Style="{StaticResource Header}" Visibility="{Binding DigitalInputVisibility}">Digital inputs</TextBlock>
+
+            <ItemsControl ItemsSource="{Binding DigitalInputs}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                        <view:InputOutputView />
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+
+            <!--
+            
+                Analog outputs
+            
+            -->
+            <TextBlock Style="{StaticResource Header}" Visibility="{Binding AnalogOutputVisibility}">Analog outputs</TextBlock>
+
+            <ItemsControl ItemsSource="{Binding AnalogOutputs}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                        <view:InputOutputView />
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+
+            <!--
+            
+                Digital outputs
+            
+            -->
+            <TextBlock Style="{StaticResource Header}" Visibility="{Binding DigitalOutputVisibility}">Digital outputs</TextBlock>
+
+            <ItemsControl ItemsSource="{Binding DigitalOutputs}">
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                        <view:InputOutputView />
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
         </StackPanel>
     </ScrollViewer>
 </Window>

Windows/MassiveKnob/ViewModel/ActionViewModel.cs

@@ -0,0 +1,29 @@
+using System.Windows;
+using MassiveKnob.Plugin;
+
+namespace MassiveKnob.ViewModel
+{
+    public class ActionViewModel
+    {
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public string Name => RepresentsNull ? Strings.ActionNotConfigured : Action.Name;
+        public string Description => RepresentsNull ? null : Action.Description;
+
+        public Visibility DescriptionVisibility => string.IsNullOrEmpty(Description) ? Visibility.Collapsed : Visibility.Visible;
+        // ReSharper restore UnusedMember.Global
+
+        public IMassiveKnobActionPlugin Plugin { get; }
+        public IMassiveKnobAction Action { get; }
+
+        public bool RepresentsNull => Action == null;
+
+
+
+        public ActionViewModel(IMassiveKnobActionPlugin plugin, IMassiveKnobAction action)
+        {
+            Plugin = plugin;
+            Action = action;
+        }
+    }
+
+}

Windows/MassiveKnob/ViewModel/DeviceViewModel.cs

@@ -0,0 +1,25 @@
+using System.Windows;
+using MassiveKnob.Plugin;
+
+namespace MassiveKnob.ViewModel
+{
+    public class DeviceViewModel
+    {
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public string Name => Device.Name;
+        public string Description => Device.Description;
+
+        public Visibility DescriptionVisibility => string.IsNullOrEmpty(Description) ? Visibility.Collapsed : Visibility.Visible;
+        // ReSharper restore UnusedMember.Global
+
+        public IMassiveKnobDevicePlugin Plugin { get; }
+        public IMassiveKnobDevice Device { get; }
+
+
+        public DeviceViewModel(IMassiveKnobDevicePlugin plugin, IMassiveKnobDevice device)
+        {
+            Plugin = plugin;
+            Device = device;
+        }
+    }
+}

Windows/MassiveKnob/ViewModel/InputOutputViewModel.cs

@@ -0,0 +1,86 @@
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Windows.Controls;
+using MassiveKnob.Model;
+using MassiveKnob.Plugin;
+
+namespace MassiveKnob.ViewModel
+{
+    public class InputOutputViewModel : INotifyPropertyChanged
+    {
+        private readonly SettingsViewModel settingsViewModel;
+        private readonly IMassiveKnobOrchestrator orchestrator;
+        private readonly MassiveKnobActionType actionType;
+        private readonly int index;
+
+        private ActionViewModel selectedAction;
+        private UserControl actionSettingsControl;
+
+
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public string DisplayName => actionType == MassiveKnobActionType.OutputAnalog || actionType == MassiveKnobActionType.OutputDigital
+            ? $"Output #{index + 1}"
+            : $"Input #{index + 1}";
+
+        public IList<ActionViewModel> Actions => settingsViewModel.Actions;
+
+
+        public ActionViewModel SelectedAction
+        {
+            get => selectedAction;
+            set
+            {
+                if (value == selectedAction)
+                    return;
+
+                selectedAction = value == null || value.RepresentsNull ? null : value;
+                var actionInfo = orchestrator.SetAction(actionType, index, selectedAction?.Action);
+
+                OnPropertyChanged();
+
+                ActionSettingsControl = actionInfo?.Instance.CreateSettingsControl();
+            }
+        }
+
+        public UserControl ActionSettingsControl
+        {
+            get => actionSettingsControl;
+            set
+            {
+                if (value == actionSettingsControl)
+                    return;
+
+                actionSettingsControl = value;
+                OnPropertyChanged();
+            }
+        }
+        // ReSharper restore UnusedMember.Global            
+
+
+        public InputOutputViewModel(SettingsViewModel settingsViewModel, IMassiveKnobOrchestrator orchestrator, MassiveKnobActionType actionType, int index)
+        {
+            this.settingsViewModel = settingsViewModel;
+            this.orchestrator = orchestrator;
+            this.actionType = actionType;
+            this.index = index;
+
+            var actionInfo = orchestrator.GetAction(actionType, index);
+            
+            selectedAction = actionInfo != null
+                ? Actions.SingleOrDefault(a => !a.RepresentsNull && a.Action.ActionId == actionInfo.Info.ActionId)
+                : Actions.Single(a => a.RepresentsNull);
+
+            actionSettingsControl = actionInfo?.Instance.CreateSettingsControl();
+        }
+
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

Windows/MassiveKnob/ViewModel/SettingsViewModel.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using System.Windows;
 using System.Windows.Controls;
 using MassiveKnob.Model;
 using MassiveKnob.Plugin;
@@ -11,47 +12,42 @@ namespace MassiveKnob.ViewModel
 {
     public class SettingsViewModel : INotifyPropertyChanged
     {
-        private readonly Settings.Settings settings;
         private readonly IMassiveKnobOrchestrator orchestrator;
         private DeviceViewModel selectedDevice;
         private UserControl settingsControl;
 
+        private DeviceSpecs? specs;
+        private IEnumerable<InputOutputViewModel> analogInputs;
+        private IEnumerable<InputOutputViewModel> digitalInputs;
+        private IEnumerable<InputOutputViewModel> analogOutputs;
+        private IEnumerable<InputOutputViewModel> digitalOutputs;
+
+
+        // ReSharper disable UnusedMember.Global - used by WPF Binding
+        public IList<DeviceViewModel> Devices { get; }
+        public IList<ActionViewModel> Actions { get; }
+
 
-        public IEnumerable<DeviceViewModel> Devices { get; }
         public DeviceViewModel SelectedDevice
         {
             get => selectedDevice;
-
             set
             {
                 if (value == selectedDevice)
                     return;
 
                 selectedDevice = value;
-                var deviceInstance = orchestrator.SetActiveDevice(value?.Device);
+                var deviceInfo = orchestrator.SetActiveDevice(value?.Device);
-                
-                if (value == null)
-                    settings.Device = null;
-                else
-                {
-                    settings.Device = new Settings.Settings.DeviceSettings
-                    {
-                        PluginId = value.Plugin.PluginId,
-                        DeviceId = value.Device.DeviceId,
-                        Settings = null
-                    };
-                }
 
                 OnPropertyChanged();
 
-                SettingsControl = deviceInstance?.CreateSettingsControl();
+                SettingsControl = deviceInfo?.Instance.CreateSettingsControl();
             }
         }
 
         public UserControl SettingsControl
         {
             get => settingsControl;
-
             set
             {
                 if (value == settingsControl)
@@ -62,20 +58,113 @@ namespace MassiveKnob.ViewModel
             }
         }
 
-
+        public DeviceSpecs? Specs
-
+        {
-
+            get => specs;
-        public SettingsViewModel(IPluginManager pluginManager, Settings.Settings settings, IMassiveKnobOrchestrator orchestrator)
+            set
+            {
+                specs = value;
+                OnPropertyChanged();
+                OnOtherPropertyChanged("AnalogInputVisibility");
+                OnOtherPropertyChanged("DigitalInputVisibility");
+
+                AnalogInputs = Enumerable
+                    .Range(0, specs?.AnalogInputCount ?? 0)
+                    .Select(i => new InputOutputViewModel(this, orchestrator, MassiveKnobActionType.InputAnalog, i));
+
+                DigitalInputs = Enumerable
+                    .Range(0, specs?.DigitalInputCount ?? 0)
+                    .Select(i => new InputOutputViewModel(this, orchestrator, MassiveKnobActionType.InputDigital, i));
+            }
+        }
+
+        public Visibility AnalogInputVisibility => specs.HasValue && specs.Value.AnalogInputCount > 0
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+
+        public IEnumerable<InputOutputViewModel> AnalogInputs
+        {
+            get => analogInputs;
+            set
+            {
+                analogInputs = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public Visibility DigitalInputVisibility => specs.HasValue && specs.Value.DigitalInputCount > 0
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+
+        public IEnumerable<InputOutputViewModel> DigitalInputs
+        {
+            get => digitalInputs;
+            set
+            {
+                digitalInputs = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public Visibility AnalogOutputVisibility => specs.HasValue && specs.Value.AnalogOutputCount > 0
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+
+        public IEnumerable<InputOutputViewModel> AnalogOutputs
+        {
+            get => analogOutputs;
+            set
+            {
+                analogOutputs = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public Visibility DigitalOutputVisibility => specs.HasValue && specs.Value.DigitalOutputCount > 0
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+
+        public IEnumerable<InputOutputViewModel> DigitalOutputs
+        {
+            get => digitalOutputs;
+            set
+            {
+                digitalOutputs = value;
+                OnPropertyChanged();
+            }
+        }
+        // ReSharper restore UnusedMember.Global
+
+
+
+        public SettingsViewModel(IPluginManager pluginManager, IMassiveKnobOrchestrator orchestrator)
         {
-            this.settings = settings;
             this.orchestrator = orchestrator;
 
-            Devices = pluginManager.GetDevicePlugins().SelectMany(dp => dp.Devices.Select(d => new DeviceViewModel(dp, d)));
+            orchestrator.ActiveDeviceSubject.Subscribe(info => { Specs = info.Specs; });
 
-            if (settings.Device != null)
+
-                SelectedDevice = Devices.FirstOrDefault(d =>
+            Devices = pluginManager.GetDevicePlugins()
-                    d.Plugin.PluginId == settings.Device.PluginId &&
+                .SelectMany(dp => dp.Devices.Select(d => new DeviceViewModel(dp, d)))
-                    d.Device.DeviceId == settings.Device.DeviceId);
+                .ToList();
+
+            var allActions = new List<ActionViewModel>
+            {
+                new ActionViewModel(null, null)
+            };
+
+            allActions.AddRange(
+                pluginManager.GetActionPlugins()
+                    .SelectMany(ap => ap.Actions.Select(a => new ActionViewModel(ap, a))));
+            
+            Actions = allActions;
+
+            if (orchestrator.ActiveDevice == null)
+                return;
+
+            selectedDevice = Devices.Single(d => d.Device.DeviceId == orchestrator.ActiveDevice.Info.DeviceId);
+            SettingsControl = orchestrator.ActiveDevice.Instance.CreateSettingsControl();
+            Specs = orchestrator.ActiveDevice.Specs;
         }
 
 
@@ -86,24 +175,9 @@ namespace MassiveKnob.ViewModel
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
 
-        
+        protected virtual void OnOtherPropertyChanged(string propertyName)
-
-        public class DeviceViewModel
         {
-            // ReSharper disable UnusedMember.Global - used by WPF Binding
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-            public string Name => Device.Name;
-            public string Description => Device.Description;
-            // ReSharper restore UnusedMember.Global
-
-            public IMassiveKnobDevicePlugin Plugin { get; }
-            public IMassiveKnobDevice Device { get; }
-
-
-            public DeviceViewModel(IMassiveKnobDevicePlugin plugin, IMassiveKnobDevice device)
-            {
-                Plugin = plugin;
-                Device = device;
-            }
         }
     }
 }