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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_analog_map(self):
 """ This method requests a Firmata analog map query and returns the results. :returns: An analog map response or None if a timeout occurs """

        # get the current time to make sure a report is retrieved
        current_time = time.time()

        # if we do not have existing report results, send a Firmata
        # message to request one
        if self.query_reply_data.get(
                PrivateConstants.ANALOG_MAPPING_RESPONSE) is None:
            await self._send_sysex(PrivateConstants.ANALOG_MAPPING_QUERY)
            # wait for the report results to return for 2 seconds
            # if the timer expires, shutdown
            while self.query_reply_data.get(
                    PrivateConstants.ANALOG_MAPPING_RESPONSE) is None:
                elapsed_time = time.time()
                if elapsed_time - current_time > 4:
                    return None
                await asyncio.sleep(self.sleep_tune)
        return self.query_reply_data.get(
            PrivateConstants.ANALOG_MAPPING_RESPONSE)