Third Party server with UE4 : part 2 : C++ : include package

For now, we need C++ code.
I will not explain how ue manage class, path to includes, and so on. All is not very clear for me.
It seems that when you need to use "package", you have to include it in your build.cs.

Here it is a screenshot of filetree on my computer, of the engine source. In red the non exhaustive list of package under source/runtime.

We will need socket package, and networking, so in my build.cs

using UnrealBuildTool;

public class pocshim : ModuleRules
{
    public pocshim(TargetInfo Target)
    {
        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore","Blu", "Networking", "Sockets","Json" });

    }
}