Multiple CAN bus support

[colbycheese55]

Suggested API
CANBus(bus: str)
Constructor

sendMessage(self, msg: CanMessage) -> None
Sends a CAN message

getReceivedMessages(self, message_name: str) -> list[CanMessage]
Returns a list of received CAN messages of the specified type, then clears the list

Utility API (note that all functions are static)

loggedMessages = dict[str, dict[str, list[CanMessage]]]
ser = Serial()

readMessages() -> NoReturn
Will run infinitely in a thread, reading in messages and putting them in the global dictionary loggedMessages, will be started by the test runner, will first create the serial object (ser)

Clear() -> None
Clears loggedMessages, will be run at the start of each test by the test runner

Implementation Notes

• make sure to lock loggedMessages
• in the UART message format, use a few of the upper bits in the length byte to specify which CAN bus