TCP server - client communication app design

I am not sure if I am qualified to post the reply but try nonetheless.

 

First, have you thought of something yourself or not? That is very important. Because ultimately you will need to weigh the pros and cons of each approach (design decision) you take.

 

I think an ASP.NET MVC WebAPI project on a server side and a Xamarine project on client is all that you need.

 

Things like "server should able to listen multiple clients on tcp port using separate thread for each client" are all build into IIS. I am sure, you wouldn't want to reinvent the wheel.

 

For two way communication you can use SingnalR technology.