HI, everyone! I am student and just trying to understand kotlin programming language. Is there someone who can help me with app connection to TCP server using IP and port? I need to connect to the server and retrieve data from there. I am ready reading if someone has great material. I never have done this before, so I dont know from where to start.

Are you talking about raw socket or websocket? RawSockets: https://ktor.io/servers/raw-sockets.html WebSockets: https://ktor.io/clients/websockets.html

how is that kotlin specific? the question is a bit large...

This is a task - create android aplication using Kotlin programming language. Server side already has developed. I have IP and port number, and I need to create TCP connection. When connect to server, app need to send command "AUTHORIZE,

Then use https://ktor.io/clients/websockets.html

I tried something like this, but it dont work.

What exactly is not working? Please read this for future help requests: http://sscce.org/

In code above error was due to using main thread. So I created AsyncTask for socket. And now I dont understand what I have done incorrect- Cannot evaluate android.system.StructAddrinfo.toString. Do I declare ip address in socket incorrect?