How can i develop a multiServer and multiClient chat system?

Question

exchanging discussion by multiple client through different server on real-time.

Answer 1

You don't really need one:

https://code.sololearn.com/WCxlD19g0PJ9/?ref=app
https://code.sololearn.com/WtFXsv7tdPW0/?ref=app

Answer 2

Look at using Web sockets. If using ASP.NET look at SignalR ... there is also a free one you can try and not have to build it yourself. look up "tawk.io"