code: async def stepper_config(self, command):
          
          steps_per_revs = int(command[0])
          pins = command[1]
          pin1 = int(pins[0])
          pin2 = int(pins[1])
          pin3 = int(pins[2])
          pin4 = int(pins[3])
          await self.core.stepper_config(steps_per_revs, [pin1, pin2, pin3, pin4])
docs: This method configures 4 pins for stepper motor operation.
          This is a FirmataPlus feature.
          :param command: {"method": "stepper_config", "params": [STEPS_PER_REVOLUTION, [PIN1, PIN2, PIN3, PIN4]]}
          :returns:No message returned.