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.

async def stepper_config(self, command):
        """
        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.
        """
        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])