Initial commit

App.axaml

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+<Application
+    x:Class="SddpViewer.App"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    RequestedThemeVariant="Default">
+    <!--  "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options.  -->
+
+    <Application.Styles>
+        <FluentTheme />
+        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml" />
+    </Application.Styles>
+</Application>

App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace SddpViewer;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

DiscoveredDeviceViewModel.cs

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+namespace SddpViewer
+{
+  using System;
+  using System.Threading.Tasks;
+
+  using CommunityToolkit.Mvvm.ComponentModel;
+
+  using Rssdp;
+
+  public partial class DiscoveredDeviceViewModel : ObservableObject
+  {
+    private readonly DiscoveredSsdpDevice device;
+
+    public DiscoveredDeviceViewModel(DiscoveredSsdpDevice device)
+    {
+      this.device = device;
+    }
+
+    /// <summary>
+    /// Sets or returns the type of notification, being either a uuid, device type, service type or upnp:rootdevice.
+    /// </summary>
+    public string NotificationType => this.device.NotificationType;
+
+    /// <summary>
+    /// Sets or returns the universal service name (USN) of the device.
+    /// </summary>
+    public string Usn => this.device.Usn;
+
+    /// <summary>
+    /// Sets or returns a URL pointing to the device description document for this device.
+    /// </summary>
+    public Uri DescriptionLocation => this.device.DescriptionLocation;
+
+    /// <summary>
+    /// Sets or returns the length of time this information is valid for (from the <see cref="P:Rssdp.DiscoveredSsdpDevice.AsAt" /> time).
+    /// </summary>
+    public TimeSpan CacheLifetime => this.device.CacheLifetime;
+
+    /// <summary>
+    /// Sets or returns the date and time this information was received.
+    /// </summary>
+    public DateTimeOffset AsAt => this.device.AsAt;
+
+    [ObservableProperty]
+    private string _friendlyName = "";
+
+    public async Task GetFurtherInformationAsync()
+    {
+      var ssdpDevice = await this.device.GetDeviceInfo().ConfigureAwait(false);
+      FriendlyName = ssdpDevice.FriendlyName;
+    }
+  }
+}

MainWindow.axaml

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+<Window
+    x:Class="SddpViewer.MainWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:sddpViewer="clr-namespace:SddpViewer"
+    Title="SDDP viewer"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    x:CompileBindings="True"
+    x:DataType="sddpViewer:MainWindowViewModel"
+    mc:Ignorable="d">
+    <Window.DataContext>
+        <sddpViewer:MainWindowViewModel />
+    </Window.DataContext>
+    <Grid RowDefinitions="Auto, *">
+        <StackPanel Margin="10" Spacing="5">
+            <TextBlock Text="Settings" />
+            <TextBox
+                Text="{Binding DeviceIpAddress}"
+                UseFloatingWatermark="True"
+                Watermark="Device IP Address" />
+            <TextBox
+                Text="{Binding NotificationFilter}"
+                UseFloatingWatermark="True"
+                Watermark="Notification filter" />
+            <Button Command="{Binding SearchDevicesNowCommand}" Content="Search now" />
+        </StackPanel>
+        <DataGrid
+            Grid.Row="1"
+            AutoGenerateColumns="True"
+            IsReadOnly="True"
+            ItemsSource="{Binding SddpDevices}" />
+    </Grid>
+</Window>

MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace SddpViewer;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

MainWindowViewModel.cs

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+namespace SddpViewer;
+
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+using Rssdp;
+
+public partial class MainWindowViewModel : ObservableObject
+{
+  [ObservableProperty]
+  private string _deviceIpAddress = "192.168.42.193";
+
+  [ObservableProperty]
+  private string _notificationFilter = "upnp:rootdevice";
+
+  public ObservableCollection<DiscoveredDeviceViewModel> SddpDevices { get; } = new();
+
+  [RelayCommand(AllowConcurrentExecutions = false)]
+  private async Task SearchDevicesNowAsync()
+  {
+    SddpDevices.Clear();
+    var locator = new SsdpDeviceLocator(DeviceIpAddress);
+    if (!string.IsNullOrWhiteSpace(NotificationFilter))
+    {
+      locator.NotificationFilter = NotificationFilter;
+    }
+    var availableDevices = await locator.SearchAsync().ConfigureAwait(true);
+    foreach (var ssdpDevice in availableDevices)
+    {
+        var discoveredDeviceViewModel = new DiscoveredDeviceViewModel(ssdpDevice);
+        SddpDevices.Add(discoveredDeviceViewModel);
+    }
+    await Parallel.ForEachAsync(
+      SddpDevices,
+      async (device, token) =>
+      {
+        await device.GetFurtherInformationAsync().ConfigureAwait(true);
+      }
+    ).ConfigureAwait(true);
+  }
+}

Program.cs

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+using Avalonia;
+using System;
+
+namespace SddpViewer;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}

SddpViewer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.0.5" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.5" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.5" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.5" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.5" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.2" />
+    <PackageReference Include="rssdp" Version="4.0.4" />
+  </ItemGroup>
+</Project>

SddpViewer.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SddpViewer", "SddpViewer.csproj", "{8383E1D9-75BD-46D0-B0D5-686AA49EFFF1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8383E1D9-75BD-46D0-B0D5-686AA49EFFF1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8383E1D9-75BD-46D0-B0D5-686AA49EFFF1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8383E1D9-75BD-46D0-B0D5-686AA49EFFF1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8383E1D9-75BD-46D0-B0D5-686AA49EFFF1}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="SddpViewer.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>