2 months of writing netcode finally paid off as I now have deterministic lockstep P2P multiplayer in UE4.
This is a great step for the game and with it, the biggest technical challenge has been overcome.

Hi. It's awsome technical function and I also want to realise this p2p function on unreal4. and I know this is a difficult challenges! So is there any way to ask about your realise this function more details. or if you already open that source code on github I am very glad to here that! Excpet to your reply! thanks.