v4.0.0 (#1357)

Samples/Program.cs

@@ -0,0 +1,48 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Reflection;
+
+Console.WriteLine("Welcome to MQTTnet samples!");
+Console.WriteLine();
+
+var sampleClasses = Assembly.GetExecutingAssembly().GetExportedTypes().OrderBy(c => c.Name).ToList();
+
+var index = 0;
+foreach (var sampleClass in sampleClasses)
+{
+    Console.WriteLine($"{index} = {sampleClass.Name}");
+    index++;
+}
+
+Console.Write("Please choose sample class (press Enter to continue): ");
+var input = Console.ReadLine();
+var selectedIndex = int.Parse(input ?? "0");
+var selectedSampleClass = sampleClasses[selectedIndex];
+var sampleMethods = selectedSampleClass.GetMethods(BindingFlags.Static | BindingFlags.Public).OrderBy(m => m.Name).ToList();
+
+index = 0;
+foreach (var sampleMethod in sampleMethods)
+{
+    Console.WriteLine($"{index} = {sampleMethod.Name}");
+    index++;
+}
+
+Console.Write("Please choose sample (press Enter to continue): ");
+input = Console.ReadLine();
+selectedIndex = int.Parse(input ?? "0");
+var selectedSampleMethod = sampleMethods[selectedIndex];
+
+Console.WriteLine("Executing sample...");
+Console.WriteLine();
+
+try
+{
+    var task = selectedSampleMethod.Invoke(null, null) as Task;
+    task?.Wait();
+}
+catch (Exception exception)
+{
+    Console.WriteLine(exception.ToString());
+}