It decodes the content of the packets. The game boy serial port essentially executes a transfer in both directions at the same time, so the other side has to ha

It decodes the content of the packets. The game boy serial port essentially executes a transfer in both directions at the same time, so the other side has to have its data ready by the time the transfer starts. Making this generic over the internet would be downright impossible, especially considering some games need to have one of the sides control the clock (when the transfers take place) in order for the game logic to work.