https://mindofai.github.io/Building-a-Real-Time-Chat-App-With-SignalR-and-Xamarin/
https://proxus.dk/Blog/Post/2014/07/17/developing-and-deploying-a-signalr-chat-web-app-to-iis
https://docs.microsoft.com/en-us/aspnet/signalr/overview/getting-started/tutorial-high-frequency-realtime-with-signalr
