This method retrieves the latest encoder data value.
        It is a FirmataPlus feature.

        :param pin: Encoder Pin

        :returns: encoder data value

def encoder_read(self, pin):
        """
        This method retrieves the latest encoder data value.
        It is a FirmataPlus feature.

        :param pin: Encoder Pin

        :returns: encoder data value
        """
        try:
            task = asyncio.ensure_future(self.core.encoder_read(pin))
            value = self.loop.run_until_complete(task)
            return value
        except RuntimeError:
            self.shutdown()