Add project files.

BotBridge.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
+    <InvariantGlobalization>true</InvariantGlobalization>
+  </PropertyGroup>
+
+</Project>

BotBridge.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.7.34024.191
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BotBridge", "BotBridge.csproj", "{81206CA0-73E6-48B0-B061-97131963EA7D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{81206CA0-73E6-48B0-B061-97131963EA7D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{81206CA0-73E6-48B0-B061-97131963EA7D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{81206CA0-73E6-48B0-B061-97131963EA7D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{81206CA0-73E6-48B0-B061-97131963EA7D}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FC656DCA-2289-41AA-91ED-49EFF75A916A}
+	EndGlobalSection
+EndGlobal

BotExtHost.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BotBridge;
+
+internal class BotExtHost
+{
+
+    private readonly Stream _stdIn = Console.OpenStandardInput();
+    private readonly Stream _stdOut = Console.OpenStandardOutput();
+
+
+    public void WriteData(byte[] data)
+    {
+        byte[] dataLength = BitConverter.GetBytes(data.Length);
+        if (BitConverter.IsLittleEndian)
+        {
+            Array.Reverse(dataLength);
+        }
+        _stdOut.Write(dataLength, 0, dataLength.Length);
+
+        _stdOut.Write(data, 0, data.Length);
+        _stdIn.Flush();
+    }
+
+    public byte[] ReadData()
+    {
+        byte[] dataLengthBytes = new byte[4];
+        _stdIn.Read(dataLengthBytes, 0, 4);
+        if (BitConverter.IsLittleEndian)
+        {
+            Array.Reverse(dataLengthBytes);
+        }
+        int dataLength = BitConverter.ToInt32(dataLengthBytes, 0);
+
+        byte[] data = new byte[dataLength];
+        _stdIn.Read(data, 0, dataLength);
+        return data;
+    }
+
+
+}

BotExtPipe.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO.Pipes;
+
+namespace BotBridge;
+
+internal class BotExtPipe
+{
+    private readonly NamedPipeServerStream _pipeServerStream;
+
+    public BotExtPipe(string pipeName)
+    {
+        _pipeServerStream = new NamedPipeServerStream(pipeName, PipeDirection.InOut, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous);
+    }
+
+    public void WaitForConnection()
+    {
+        _pipeServerStream.WaitForConnection();
+    }
+
+    public byte[] ReadData()
+    {
+        int messageLength = BitConverter.ToInt32(ReadBytes(_pipeServerStream, 4), 0);
+        return ReadBytes(_pipeServerStream, messageLength);
+    }
+
+    public void WriteData(byte[] data)
+    {
+        byte[] dateLength = BitConverter.GetBytes(data.Length);
+        _pipeServerStream.Write(dateLength, 0, dateLength.Length);
+        _pipeServerStream.Write(data, 0, data.Length);
+    }
+
+
+    private static byte[] ReadBytes(NamedPipeServerStream pipeServerStream, int bytesToRead)
+    {
+        byte[] buffer = new byte[bytesToRead];
+        int bytesRead = 0;
+        int totalBytesRead = 0;
+        do
+        {
+            bytesRead = pipeServerStream.Read(buffer, totalBytesRead, bytesToRead - totalBytesRead);
+            totalBytesRead += bytesRead;
+        } while (bytesRead > 0 && totalBytesRead < bytesToRead);
+        return buffer;
+    }
+
+}

Program.cs

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+using System.Text;
+
+namespace BotBridge;
+
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        BotExtHost botExtHost = new BotExtHost();
+
+        while (true)
+        {
+            BotExtPipe botExtPipe = new BotExtPipe("BotExtPipe");
+            botExtPipe.WaitForConnection();
+
+            while (true)
+            {
+
+                byte[] clientData = botExtPipe.ReadData();
+                botExtHost.WriteData(clientData);
+                byte[] serverData = botExtHost.ReadData();
+                botExtPipe.WriteData(serverData);
+
+            }
+        }
+    }
+}