title: Open TCP Socket with Objective-c
body: <p>How to create a TCP socket using Objective-C, check if some TCP ports are opened on the server?</p>
  
  <p>I tried using some tutorials but none worked, because I need to create a server using an IP (198.168.0.000) and not a site, such as paypal.com, as some blog posts use.</p>
  
  <p>I'm a little confused about which class to use and how to use. I know that is not the best place to ask, but do not know where to search.</p>
  
  <p>Thank you for your help!</p>