code: def _calculate_minimum_silent_period(baudrate):
      
      _checkNumerical(baudrate, minvalue=1, description='baudrate')  # Avoid division by zero
  
      BITTIMES_PER_CHARACTERTIME = 11
      MINIMUM_SILENT_CHARACTERTIMES = 3.5
  
      bittime = 1 / float(baudrate)
      return bittime * BITTIMES_PER_CHARACTERTIME * MINIMUM_SILENT_CHARACTERTIMES
docs: Calculate the silent period length to comply with the 3.5 character silence between messages.
  
      Args:
          baudrate (numerical): The baudrate for the serial port
  
      Returns:
          The number of seconds (float) that should pass between each message on the bus.
  
      Raises:
          ValueError, TypeError.