code: async def readline(self):
          
          future = asyncio.Future()
          data_available = False
          while True:
              if not data_available:
                  if not self.my_serial.inWaiting():
                      await asyncio.sleep(self.sleep_tune)
                  else:
                      data_available = True
                      data = self.my_serial.readline()
                      future.set_result(data)
              else:
                  if not future.done():
                      await asyncio.sleep(self.sleep_tune)
                  else:
                      return future.result()
docs: This is an asyncio adapted version of pyserial read.
          It provides a non-blocking read and returns a line of data read.
  
          :return: A line of data