Why does a coffee maker need Internet connectivity? Ok, I can maybe see a way to connect to your LAN so that you can say, "Oh, crap, I forgot to set my coffeemaker to automatically start brewing so that it's ready as soon as my shower is done...good thing I have the app on my smartphone so that I can set it without getting out of bed"...unless, of course, you also end up thinking, "Oh, crap, I hope I remembered to fill the reservoir with water, & to put a fresh filter & grounds in it", or "I hope I remembered to make sure the Keurig-style cups in the hopper are ready to go", since no water = no coffee, & no coffee grounds = plain hot water.
But that's the problem: how many times are you going to say on the way home from work, "Dang, I could really use a fresh cup of coffee when it's sunny & hot outside as I get home, I'd better make sure my coffeemaker has it brewed by the time I pull into the driveway...sure hope I remembered to refill the water reservoir this morning...".