code: def i2c_config(self, read_delay_time=0):
          
          task = asyncio.ensure_future(self.core.i2c_config(read_delay_time))
          self.loop.run_until_complete(task)
docs: This method configures Arduino i2c with an optional read delay time.
  
          :param read_delay_time: firmata i2c delay time
  
          :returns: No return value