docs: def state_attributes(self):
          """Return all attributes of the vehicle."""
  
          address_attributes = None
          if (self.current_address is not None):
              address_attributes = self.current_address.state_attributes()
  
          return {
              'id': self.identifier,
              'make': self.make,
              'model': self.model,
              'license_plate': self.license_plate,
              'active': self.active,
              'odo': self.odo,
              'latitude': self.latitude,
              'longitude': self.longitude,
              'altitude': self.altitude,
              'speed': self.speed,
              'last_seen': self.last_seen,
              'friendly_name': self.license_plate,
              'equipment_id': self.equipment_id,
              'fuel_level': self.fuel_level,
              'malfunction_light': self.malfunction_light,
              'coolant_temperature': self.coolant_temperature,
              'power_voltage': self.power_voltage,
              'current_max_speed': self.current_maximum_speed,
              'current_address': address_attributes
          }