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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def get_protocol_version(self):
 """ This method returns the major and minor values for the protocol version, i.e. 2.4 :returns: Firmata protocol version """

        if self.query_reply_data.get(PrivateConstants.REPORT_VERSION) == '':
            await self._send_command([PrivateConstants.REPORT_VERSION])
            while self.query_reply_data.get(
                    PrivateConstants.REPORT_VERSION) == '':
                await asyncio.sleep(self.sleep_tune)
        return self.query_reply_data.get(PrivateConstants.REPORT_VERSION)