def METHOD_NAME(self, dev):
    """
    Arguments:
        dev(str): The tty device name
    Returns:
        (str): This method will return the status of the tty device `start/running` or `stop/waiting`, along with `process-ID` if it is managed by upstart else it will return `None`.
    """
    if dev and dev in self.tty.keys():
        return self.tty[dev].get('status', None)