Add project files.

LEDNotifier.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <ProduceReferenceAssembly>False</ProduceReferenceAssembly>
+    <DebugType>none</DebugType>
+    <Configurations>Release</Configurations>
+    <EnableNETAnalyzers>False</EnableNETAnalyzers>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+    <Deterministic>False</Deterministic>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="HidSharp" Version="2.1.0" />
+  </ItemGroup>
+
+</Project>

LEDNotifier.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31919.166
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LEDNotifier", "LEDNotifier.csproj", "{108A185D-35DB-4319-A2A7-39E5CB5D133B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{108A185D-35DB-4319-A2A7-39E5CB5D133B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{108A185D-35DB-4319-A2A7-39E5CB5D133B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3B8A9864-C644-4081-A4E7-750E3B46E4BF}
+	EndGlobalSection
+EndGlobal

Program.cs

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+using HidSharp;
+using System;
+
+byte color_code = 0x0;
+
+if (args.Length != 1)
+{
+    Console.WriteLine("No or too many arguments");
+    return 1;
+}
+
+Random rnd = new Random();
+switch (args[0])
+{
+    case "off":
+        color_code = 0;
+        break;
+    case "blue":
+        color_code = 1;
+        break;
+    case "red":
+        color_code = 2;
+        break;
+    case "green":
+        color_code = 3;
+        break;
+    case "aqua":
+        color_code = 4;
+        break;
+    case "purple":
+        color_code = 5;
+        break;
+    case "yellow":
+        color_code = 6;
+        break;
+    case "white":
+        color_code = 7;
+        break;
+    case "random":
+        color_code = (byte)rnd.Next(1, 7);
+        break;
+    default:
+        Console.WriteLine("Invalid argument");
+        return 1;
+}
+
+
+HidDevice hidDevice;
+var ret = DeviceList.Local.TryGetHidDevice(out hidDevice, vendorID: 0x1294, productID: 0x1320);
+
+if(ret == false)
+{
+    Console.WriteLine("Device not found");
+    return 1;
+}
+
+DeviceStream deviceStream;
+ret = hidDevice.TryOpen(out deviceStream);
+
+if (ret == false)
+{
+    Console.WriteLine("Failed to open stream");
+    return 1;
+}
+
+
+byte[] data = { 0xff, color_code };
+deviceStream.Write(data, 0, data.Length);
+
+return 0;

Properties/launchSettings.json

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+{
+  "profiles": {
+    "LEDNotifier": {
+      "commandName": "Project",
+      "commandLineArgs": "random"
+    }
+  }
+}