ExternalProtocol

Arduino Controllers

Objects in space was made with the intention that it could be playable with just buttons.
You can also get almost all the information from the in-game UI sent back to your Arduino.
There are 193 Commands Serial Commands, 164 Boolean Requests, and 24 Numeric Requests for a total of 381

Protocol

Currently on the OiS Serial Data Protocol page the Handshake information is incorrect
To connect your Arduino to the game you need to send 451 with a newline at the end. The game will send back 452. source(Nocturnal)