Meaning of can.BusABC.state

Hello,
please help me understand the meaning of `class BusState(Enum):`. I would like to show status of the interface (Kvaser Leaf and Vector VN1610 are on my desk) as specified by CAN specification (error active, error passive and bus-off state).
But the @property `def state(self):` of the classes `class KvaserBus(BusABC):` and `class VectorBus(BusABC):` are not implemented.

I would like to implement them but I am not sure what it shall returns
- state of the CAN bus as defined by standard (active, passive, error=busoff)
- state of the Python class BusABC (active, passive=silent_mode, error=some_driver)

The documentation says that it returns ["current state of the hardware"](https://python-can.readthedocs.io/en/master/bus.html#can.BusABC.state). Does it mean state of driver connection with HW interface or state of CAN bus controller (active->passive->busoff)?

Start with the BusState enum and the BusABC.state documentation, then inspect the unimplemented state properties in KvaserBus and VectorBus. Resolve whether the property represents CAN controller state or the Python driver's hardware connection state; done means the intended contract is decided and consistently documented or implemented for both classes.

Escrita pelo modelo de indexação a partir do texto da issue.