RealTime communication

What is the best/easiest way to do realtime communication today in 2019 ?

In the past we have been using SignalR. But SignalR sometimes goes crazy and sends thousands of messages per second. And we don't know how to fix it.

What we need to do is :

- From a GWT app send a message to all other GWT apps currently online (or send it to the server, which sends it to all connected GWT apps).

- From the server, send a message to all GWT apps

- Send a message from a .NET desktop application to all GWT apps (or send it to the server, which sends it to all connected GWT apps).

- The server is also written in .NET

I was thinking about just bare bones websockets. Since this is most the metal and you best now what is going around... 

Any hints where to look on how to work with WebSockets in GWT ? Which library to use ?

Or is WebSockets not a good idea in this case ?

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