Mostly functional implementation. Still behaves *really* weird if you take the database offline from under it.

Author: ascott18

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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+.mfractor/

demo/DemoServer/ChatHub.cs

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+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace DemoServer
+{
+    public class ChatHub : Hub
+    {
+        private readonly ILogger<ChatHub> _logger;
+
+        public ChatHub(ILogger<ChatHub> logger)
+        {
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        private string groupId = Guid.Empty.ToString();
+
+        public async Task SendMessage(string name, string message)
+        {
+            _logger.LogInformation($"{nameof(SendMessage)} called. ConnectionId:{Context.ConnectionId}, Name:{name}, Message:{message}");
+            await Clients.Group(groupId).SendAsync("BroadcastMessage", name, message);
+        }
+
+        public override async Task OnConnectedAsync()
+        {
+            _logger.LogInformation($"{nameof(OnConnectedAsync)} called.");
+
+            await base.OnConnectedAsync();
+            await Groups.AddToGroupAsync(Context.ConnectionId, Guid.Empty.ToString());
+        }
+
+        public override async Task OnDisconnectedAsync(Exception exception)
+        {
+            _logger.LogInformation(exception, $"{nameof(OnDisconnectedAsync)} called.");
+
+            await base.OnDisconnectedAsync(exception);
+            await Groups.RemoveFromGroupAsync(Context.ConnectionId, Guid.Empty.ToString());
+        }
+    }
+}

demo/DemoServer/DemoServer.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="5.0.7" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\IntelliTect.SignalR.SqlServer\IntelliTect.SignalR.SqlServer.csproj" />
+  </ItemGroup>
+
+</Project>