.NET's SignalR is actually quite good. Strongly typed message hubs on the server[0]. Wide client support. Azure SignalR[1] if you don't want to own the infrastructure to scale web sockets.

[0] https://learn.microsoft.com/en-us/aspnet/core/signalr/hubs?v...

[1] https://azure.microsoft.com/en-us/products/signalr-service

given this is about F#, the question is how ergonomic is it to use this in F#?

In the past, I found it wonky