Add project files.

PowerPlayToggle.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36310.24 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PowerPlayToggle", "PowerPlayToggle\PowerPlayToggle.csproj", "{CB632A01-826A-451D-9C1B-AA4771D9530F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CB632A01-826A-451D-9C1B-AA4771D9530F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CB632A01-826A-451D-9C1B-AA4771D9530F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CB632A01-826A-451D-9C1B-AA4771D9530F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CB632A01-826A-451D-9C1B-AA4771D9530F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {027D70E5-7641-4377-A2EF-B417DEA2C5B8}
+	EndGlobalSection
+EndGlobal

PowerPlayToggle/Models/GHubMessage.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace PowerPlayToggle.Models
+{
+    public class GHubMessage
+    {
+        public string MsgId { get; set; }
+        public string Verb { get; set; }
+        public string Path { get; set; }
+        public string Origin { get; set; }
+        public GHubResult Result { get; set; }
+        public JObject Payload { get; set; }
+
+        public static GHubMessage FromJson(string json) => JsonConvert.DeserializeObject<GHubMessage>(json);
+
+        public class GHubResult
+        {
+            public string Code { get; set; }
+            public string What { get; set; }
+        }
+    }
+}

PowerPlayToggle/PowerPlayToggle.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.10" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+    <PackageReference Include="System.Management" Version="9.0.10" />
+    <PackageReference Include="Websocket.Client" Version="5.3.0" />
+  </ItemGroup>
+
+</Project>

PowerPlayToggle/Program.cs

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+using PowerPlayToggle.Services;
+using Microsoft.Extensions.DependencyInjection;
+using PowerPlayToggle.Startup;
+
+namespace PowerPlayToggle;
+
+class Program
+{
+    public static ServiceProvider ServiceProvider;
+
+    static async Task Main(string[] args)
+    {
+        ServiceProvider = new ServiceCollection()
+            .AddServices()
+            .BuildServiceProvider();
+
+        var monitor = ServiceProvider.GetService<IMonitoringService>();
+        monitor.Start();
+
+
+        // Keep running, wait for Ctrl+C
+        ManualResetEventSlim run = new ManualResetEventSlim(false);
+        using (CancellationTokenSource cts = new CancellationTokenSource())
+        {
+            Action shutdown = () =>
+            {
+                monitor.Dispose();
+                run.Set();
+            };
+
+            Console.CancelKeyPress += (s, e) =>
+            {
+                shutdown();
+                e.Cancel = true;
+            };
+
+            run.Wait();
+        }
+    }
+}

PowerPlayToggle/Services/GHubService.cs

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+using Newtonsoft.Json;
+using PowerPlayToggle.Models;
+using System.Net.WebSockets;
+using Websocket.Client;
+using Websocket.Client.Exceptions;
+
+namespace PowerPlayToggle.Services
+{
+    public interface IGHubService : IDisposable
+    {
+        void SetChargePadMode(bool mode);
+    }
+
+    public class GHubService : IGHubService
+    {
+        private const string Websocket_Addr = "ws://127.0.0.1:9010";
+        private readonly WebsocketClient webSocket;
+        private string chargePadId = "dev00000002";
+
+        public GHubService()
+        {
+            var wsUrl = new Uri(Websocket_Addr);
+
+            var wsFactory = new Func<ClientWebSocket>(() =>
+            {
+                var wsClient = new ClientWebSocket();
+                var opt = wsClient.Options;
+
+                opt.UseDefaultCredentials = false;
+                opt.SetRequestHeader("Origin", "file://");
+                opt.SetRequestHeader("Pragma", "no-cache");
+                opt.SetRequestHeader("Cache-Control", "no-cache");
+                opt.SetRequestHeader("Sec-WebSocket-Extensions", "permessage-deflate; client_max_window_bits");
+                opt.SetRequestHeader("Sec-WebSocket-Protocol", "json");
+                opt.AddSubProtocol("json");
+                return wsClient;
+            });
+
+            webSocket = new WebsocketClient(wsUrl, wsFactory);
+            webSocket.MessageReceived.Subscribe(ParseMessage);
+            webSocket.ErrorReconnectTimeout = TimeSpan.FromSeconds(5);
+            webSocket.ReconnectTimeout = null;
+
+            StartSocket();
+        }
+
+        private void StartSocket()
+        {
+            Console.WriteLine("Connecting to GHub...");
+            try
+            {
+                webSocket.Start();
+            }
+            catch (WebsocketException e)
+            {
+                throw e;
+            }
+            Console.WriteLine("Connection successful, getting devices...");
+
+            webSocket.Send(JsonConvert.SerializeObject(new
+            {
+                msgId = "",
+                verb = "SUBSCRIBE",
+                path = "/devices/state/changed"
+            }));
+
+            webSocket.Send(JsonConvert.SerializeObject(new
+            {
+                msgId = "",
+                verb = "GET",
+                path = "/devices/list"
+            }));
+
+            webSocket.Send(JsonConvert.SerializeObject(new
+            {
+                msgId = "",
+                verb = "GET",
+                path = $"/charge_pad/{chargePadId}/charge_control"
+            }));
+        }
+
+        private void ParseMessage(ResponseMessage message)
+        {
+            var ghMesssage = GHubMessage.FromJson(message.Text);
+
+            switch(ghMesssage.Path)
+            {
+                case "/devices/list":
+                    ProcessDevices(ghMesssage);
+                    break;
+                default:
+                    if (ghMesssage.Path == $"/charge_pad/{chargePadId}/charge_control" && ghMesssage.Verb == "SET")
+                    {
+                        if (ghMesssage.Result.Code == "SUCCESS")
+                        {
+                            Console.WriteLine($"Charging mode set");
+                        }
+                    }
+                    break;
+            }
+
+            //Console.WriteLine(message.Text);
+        }
+
+        private void ProcessDevices(GHubMessage message)
+        {
+            var devices = message.Payload["deviceInfos"];
+            var powerPlayDevice = devices.FirstOrDefault(d => d["deviceType"].ToString() == "CHARGE_PAD");
+            chargePadId = powerPlayDevice["id"].ToString();
+
+            Console.WriteLine($"Retrieved PowerPlay mat ID: {chargePadId}");
+        }
+
+        public void SetChargePadMode(bool mode)
+        {
+            Console.WriteLine($"Setting charging mode to {mode}");
+            webSocket.Send(JsonConvert.SerializeObject(new
+            {
+                msgId = "",
+                verb = "SET",
+                path = $"/charge_pad/{chargePadId}/charge_control",
+                payload = new { value = mode }
+            }));
+        }
+
+        public void Dispose()
+        {
+            Console.WriteLine("Disconnecting from GHub");
+            webSocket.Dispose();
+        }
+    }
+}

PowerPlayToggle/Services/MonitoringService.cs

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+using Microsoft.Extensions.DependencyInjection;
+
+namespace PowerPlayToggle.Services
+{
+    public interface IMonitoringService : IDisposable
+    {
+        void Start();
+    }
+
+    public class MonitoringService(
+        IServiceProvider provider,
+        IWMIService wmi
+        ) : IMonitoringService
+    {
+        public void Start()
+        {
+            Console.WriteLine("Starting watch process...");
+            wmi.WatchForProcess("vrserver.exe", VRStarted, VRStopped);
+            Console.WriteLine("Watch process started");
+        }
+
+        private void VRStarted()
+        {
+            Console.WriteLine("Process started");
+            using var gHub = provider.GetService<IGHubService>();
+            Thread.Sleep(1000); // Ensure GHub service is initialised properly before proceeding
+            gHub.SetChargePadMode(false);
+            Thread.Sleep(1000);
+        }
+
+        private void VRStopped()
+        {
+            Console.WriteLine("Process ended");
+            using var gHub = provider.GetService<IGHubService>();
+            Thread.Sleep(1000); // Ensure GHub service is initialised properly before proceeding
+            gHub.SetChargePadMode(true);
+            Thread.Sleep(1000);
+        }
+
+        public void Dispose()
+        {
+            wmi.Dispose();
+        }
+    }
+}

PowerPlayToggle/Services/WMIService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Management;
+
+#pragma warning disable CA1416
+namespace PowerPlayToggle.Services
+{
+    public interface IWMIService : IDisposable
+    {
+        void WatchForProcess(string processName, Action processStarted, Action processEnded);
+    }
+
+    public class WMIService : IWMIService
+    {
+        private readonly ManagementEventWatcher startWatcher;
+        private readonly ManagementEventWatcher endWatcher;
+
+        public WMIService()
+        {
+            startWatcher = new ManagementEventWatcher();
+            endWatcher = new ManagementEventWatcher();
+        }
+
+        public void WatchForProcess(string processName, Action processStarted, Action processEnded)
+        {
+            var filter = $"TargetInstance ISA 'Win32_Process' AND TargetInstance.Name = '{processName}'";
+            startWatcher.Query = new WqlEventQuery("__InstanceCreationEvent", new TimeSpan(0,0,1), filter);
+
+            startWatcher.EventArrived += (sender, e) =>
+            {
+                processStarted.Invoke();
+            };
+            startWatcher.Start();
+
+            endWatcher.Query = new WqlEventQuery("__InstanceDeletionEvent", new TimeSpan(0, 0, 1), filter);
+            endWatcher.EventArrived += (sender, e) =>
+            {
+                processEnded.Invoke();
+            };
+            endWatcher.Start();
+        }
+
+        public void Dispose()
+        {
+            startWatcher.Stop();
+            endWatcher.Stop();
+        }
+    }
+}

PowerPlayToggle/Startup/ContainerExtensions.cs

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+using Microsoft.Extensions.DependencyInjection;
+using PowerPlayToggle.Services;
+
+namespace PowerPlayToggle.Startup
+{
+    public static class ContainerExtensions
+    {
+        public static IServiceCollection AddServices(this IServiceCollection collection)
+        {
+            return collection
+                .AddTransient<IGHubService, GHubService>()
+                .AddScoped<IWMIService, WMIService>()
+                .AddScoped<IMonitoringService, MonitoringService>();
+        }
+    }
+}

README.md

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+# PowerPlay Toggle
+
+A simple solution to toggle a Logitech PowerPlay mat off when SteamVR launches and back on when it closes.
+
+## Requirements
+
+* Logitech G-Hub needs to be running.
+
+## How it works
+
+This application uses WMI (Windows Management Instrumentation) to monitor when the process `vrserver.exe` starts and stops,
+then connects to Logitech G-Hub using a websocket to first get the ID of a PowerPlay mat, then tells G-Hub to disable or
+enable charging on that mat.
+
+As there is no documentation for the websocket protocol, it had to be reverse engineered from the G-Hub electron application.