Start early

Mark Gurman:

Apple’s approach to developing hardware from the home is yet another indicator of the company’s integrated hardware and software philosophy. Like with iTunes arriving before the iPod and the Health app arriving on iOS before the iWatch, Apple is creating a Smart Home ecosystem via its software and planting its feet in the category before introducing actual hardware.

It’s similar to the way they launched iBeacon. At first they made sure that every device is equiped with Bluetooth Low Energy. When they released iOS 7 there were already hundreds of millions of capable devices out in the wild.