Blueprint non Steam online multiplayer, onlinesubsystem=???

Hi, after further research from,

I have only just learned that onlinesubsystem=null is LAN only.

There is no clear explanation that i have found anywhere on what is actually required for this simple result:

  1. Open a map as a listen server.

  2. Have someone connect to that map over the internet via direct ip.

I have been told/seen multiple times that ue4 has its own online subsystem, but no explanation on how to access it or what is required to set it up.

So i ask, please someone explain what i need to do in order to set this up.