I have now posted a topic [PROJECT] Driver for Connecting to Your Tesla Devices with a very early, MAYBE functional (but very limited) driver to try to obtain data from a Tesla Powerwall 2. If anyone can try it out and let me know how it goes (preferably with Debug or Trace logging if you find a problem) I would appreciate it.
This will hopefully be just the start and I will receive information to be able to make it better for everyone.