In the Portal for the SignalR Service open Live trace settings and select:
Then save.
Click Open Live Trace Tool and open some more browser windows to the chat app. Send some messages through the app - you’ll see all the infromation received and sent by the hub.
If you could connect to SignalR and you knew the hub name and message format, you could easily send a message to all connected users. That’s why Managed Identity is such a good idea :)