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you're a glutton for punishment! it must take forever to track all the message meanings down.several people have already figured out how to get a Model S to accept charging from a J1772 connector. It really isn't a lot more than a square wave and a low voltage signal. I think the efforts to crack the high voltage DC charging are too often from those that want to tap into free charging at Tesla's expense. I for one would love to be able to communicate with the car so it would "open the door" to DC charging acceptance so I could build my own high voltage system. if your work uncovers the tricks there's more than a free lunch in it for you :) Great effort on your part, keep it up.