Android : I serach for a tutorial how i can write a Android Service that provide a TCP-Socet for the App

I will write a android app that can communicate with my server over the TCP Protocol an the port 2147.

The problem is if i close the App the Socet will be destroyed. I need a Servie that runs in the background evry time.

I've implementet a simple service class and give my app the autorun permission, it work's finde but i've problems to implement the TCP functionallity inside the Service class. I need help.