The function is received with a number as input and this tells the roomba what to do; clean or dock.
With the services linked up I can tell my phone it's time to clean the house and watch the roomba respond in a few seconds. This can come in handy if I want the roomba to start cleaning after I've left the house - it get's a bit loud if you're in the same room. Maybe I can set up a geofence around my apartment to clean when I've left the house. Or link it with google calendar and have it activate on whenever there is a 'clean house' calendar entry. Definitely a lot of possibilities for this setup.