async def play_tone(self, command):
        """
        This method controls a piezo device to play a tone. It is a FirmataPlus feature.
        Tone command is TONE_TONE to play, TONE_NO_TONE to stop playing.
        :param command: {"method": "play_tone", "params": [PIN, TONE_COMMAND, FREQUENCY(Hz), DURATION(MS)]}
        :returns:No return message.
        """
        pin = int(command[0])
        if command[1] == "TONE_TONE":
            tone_command = Constants.TONE_TONE
        else:
            tone_command = Constants.TONE_NO_TONE
        frequency = int(command[2])
        duration = int(command[3])
        await self.core.play_tone(pin, tone_command, frequency, duration)