Add project files.

ProtocolTests.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33424.131
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SerialTestApp", "SerialTestApp\SerialTestApp.csproj", "{25FE0910-9C8A-44CA-BE72-5FED8CD92E2E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{25FE0910-9C8A-44CA-BE72-5FED8CD92E2E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{25FE0910-9C8A-44CA-BE72-5FED8CD92E2E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{25FE0910-9C8A-44CA-BE72-5FED8CD92E2E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{25FE0910-9C8A-44CA-BE72-5FED8CD92E2E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C16A06F1-1290-45E0-8EF9-14A633A6D74D}
+	EndGlobalSection
+EndGlobal

SerialTestApp/Program.cs

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+using RJCP.IO.Ports;
+using System.Collections.Generic;
+
+namespace SerialTestApp;
+
+internal class Program
+{
+    public static bool QuitRequested { get; private set; }
+
+    static void Main(string[] args)
+    {
+        while (QuitRequested == false) 
+        {
+            Console.WriteLine($"----- SERIAL PROTOCOL TEST APP -----");
+            Console.WriteLine($"Command list:");
+            Console.WriteLine($"l = list ports");
+            Console.WriteLine($"c = connect");
+            Console.WriteLine($"q = quit");
+
+            var key = Console.ReadKey();
+
+            switch (key.Key)
+            {
+                // list com ports
+                case ConsoleKey.L:
+                    string[] ports = SerialPortStream.GetPortNames();
+                    Console.WriteLine($"Following ports were found: {Environment.NewLine}");
+                    foreach (var port in ports)
+                    {
+                        Console.WriteLine($"-- {port}");
+                    }
+                    break;
+
+                case ConsoleKey.Q:
+                    QuitRequested = true;
+                    break;
+
+                default:
+                    Console.WriteLine($"{Environment.NewLine}Did not recognize key.. {Environment.NewLine}");
+                    break;
+            }
+
+
+        }
+    }
+}

SerialTestApp/SerialTestApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SerialPortStream" Version="2.4.1" />
+  </ItemGroup>
+
+</Project>