We've included a sample ASP.NET Core project, and backend console app to show interop with the backplane. The only thing needed is RabbitMQ. I'd recommend using their docker image to spin up the broker.
The other addition we added is in the Properties/launchSettings.json, which lets us start 2 profiles on different ports. Then helps simulate horizontal scaling.
You can simulate scaleout by running the two profiles.
> cd (your path to MassTransit clone)\src\MassTransit.SignalR.Sample > dotnet run --launch-profile sample1 > dotnet run --launch-profile sample2
Then you can type a message in each, and see them show up in the other. The backplane works!!
If you have some backend services (console apps, or Mt Topshelf consumers), you might want to notify users/groups of things that have happened in realtime. You can do this by running this console app.
> cd (your path to MassTransit clone)\src\MassTransit.SignalR.SampleConsole > dotnet run
An type in a message to broadcast to all connections. You will see the message in your browsers chat messages