First version.

.gitignore

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+# Exclude Visual Studio solution and project specific user options.
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+.vs/
+*.opendb
+*.VC.db
+*.VC.VC.opendb
+*.sln
+
+# Exclude StyleCop cache files.
+[Ss]tyle[Cc]op.[Cc]ache
+
+# Exclude build result files.
+[Bb]inary/
+[Bb]in/
+[Oo]bj/
+[Dd]ebug/
+[Rr]elease/
+[Tt]estResults/
+
+# Exclude NuGet specific folders and files.
+*.nupkg
+**/[Pp]ackages/*
+!**/[Pp]ackages/[Ww]itron*
+!**/[Pp]ackages/[Bb]uild/
+!**/[Pp]ackages/[Rr]epositories.config
+
+# Exclude common temporary/log files.
+*~
+*.~*
+*.log
+
+# Exclude backup files created by some editors.
+*.bak

App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MqttDebugger"
+             x:Class="MqttDebugger.App">
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <StyleInclude Source="avares://Avalonia.Themes.Default/DefaultTheme.xaml"/>
+        <StyleInclude Source="avares://Avalonia.Themes.Fluent/Accents/FluentLight.xaml"/>
+    </Application.Styles>
+</Application>

App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using MqttDebugger.ViewModels;
+using MqttDebugger.Views;
+
+namespace MqttDebugger
+{
+    public 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();
+        }
+    }
+}

Models/Client.cs

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+using System;
+using System.Collections.Generic;
+using System.Security;
+using System.Text;
+
+namespace MqttDebugger.Models
+{
+    public class Client
+    {
+        public bool IsConnected { get; set; } = false;
+        public string Host { get; set; } = "localhost";
+        public int Port { get; set; } = 1883;
+        public MqttUser User { get; set; }
+        public string Topic { get; set; } = "myTopic";
+        public bool ConnectToInternalServer { get; set; } = false;
+    }
+}

Models/MqttMessageOptions.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MqttDebugger.Models
+{
+    public class MqttMessageOptions
+    {
+        public bool DisplayTopic { get; set; } = false;
+        public bool DisplayPayloadAsString { get; set; } = true;
+        public string FilterByTopic { get; set; } = "#";
+        public bool WritePayloadToFile { get; set; } = false;
+        public string FolderOutPath { get; set; }
+    }
+}

Models/MqttUser.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MqttDebugger.Models
+{
+    public class MqttUser
+    {
+        public string Username { get; set; }
+        public string Password { get; set; }
+
+        public MqttUser(string _username, string _password)
+        {
+            Username = _username;
+            Password = _password;
+        }
+    }
+}

Models/Server.cs

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+using System;
+using System.Collections.Generic;
+using System.Security;
+using System.Text;
+
+namespace MqttDebugger.Models
+{
+    public class Server
+    {
+        public bool IsRunning { get; set; }
+        public List<MqttUser> Users { get; set; }
+        public int Port { get; set; } = 1883;
+    }
+}

MqttDebugger.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <ApplicationIcon>logo.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="0.10.0-preview1" />
+    <PackageReference Include="Avalonia.Desktop" Version="0.10.0-preview1" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.0-preview1" />
+    <PackageReference Include="MQTTnet" Version="3.0.11" />
+  </ItemGroup>
+</Project>

Program.cs

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+using System;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.ReactiveUI;
+
+namespace MqttDebugger
+{
+    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.
+        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()
+                .LogToDebug()
+                .UseReactiveUI();
+    }
+}

Properties/PublishProfiles/FolderProfile.pubxml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+https://go.microsoft.com/fwlink/?LinkID=208121. 
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <PublishDir>bin\Release\netcoreapp3.1\publish\</PublishDir>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <SelfContained>false</SelfContained>
+    <PublishSingleFile>True</PublishSingleFile>
+    <PublishReadyToRun>True</PublishReadyToRun>
+  </PropertyGroup>
+</Project>

ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using MqttDebugger.ViewModels;
+
+namespace MqttDebugger
+{
+    public class ViewLocator : IDataTemplate
+    {
+        public bool SupportsRecycling => false;
+
+        public IControl Build(object data)
+        {
+            var name = data.GetType().FullName.Replace("ViewModel", "View");
+            var type = Type.GetType(name);
+
+            if (type != null)
+            {
+                return (Control)Activator.CreateInstance(type);
+            }
+            else
+            {
+                return new TextBlock { Text = "Not Found: " + name };
+            }
+        }
+
+        public bool Match(object data)
+        {
+            return data is ViewModelBase;
+        }
+    }
+}