How to have more control over networking like writing basic networking prefabs like NetworkTransform

Hi,

I need to have most control as possible just before Transport Layer and using Unity-made prefabs does not cut it for me. I need to do all coding on the application layer.

I don't want anything prefab and automatic, those will cause more headaches down the road if you don't know all that is going on in your application level.

I need to be conscious over every bit transferred and make sure it is necessary, when it should go out and what should happen on the other end exactly when that...

How to have more control over networking like writing basic networking prefabs like NetworkTransform