I used a self serve coke machine the other week. You scanned a QR code and then your phone would connect remotely to the machine. You selected your drink and then you pressed the dispense button on your phone. Neat tech but unusable if you don't have data or don't have a good signal. And it had a noticeable delay from pressing the button to when the actual device would stop. If you were unlucky I'm sure that somehow you could end up overfilling your cup and spilling it everywhere. Didn't look like it had much in the way of drainage.