Add project files.

TestClient/Program.cs

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+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Websocket.Client;
+
+
+var builder = new HubConnectionBuilder()
+    .WithUrl("https://api.gastrojames.ch/hubs/internal?access_token=https://api.gastrojames.ch/hubs/internal") // Replace with your SignalR hub URL
+    .WithAutomaticReconnect()
+    ;
+;
+
+var connection = builder.Build();
+
+await connection.StartAsync();
+string groupName = "67e534f8e86e816689323023"; // Replace with your actual group name
+await connection.InvokeAsync("JoinGroup", groupName);
+
+connection.On<PrintJob>("PrintJob", (args) =>
+{
+    Console.WriteLine($"Received print job for working area: {JsonSerializer.Serialize(args)}");
+
+});
+
+Console.ReadLine();
+
+public class PrintJob
+{
+    [JsonPropertyName("workingAreaId")]
+    public string WorkingAreaId { get; set; }
+    [JsonPropertyName("content")]
+    public string Content { get; set; }
+}

TestClient/TestClient.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="10.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.1" />
+    <PackageReference Include="Websocket.Client" Version="5.3.0" />
+  </ItemGroup>
+
+</Project>