What do the lights on the hub mean?

From left to right the lights are:

Status light: Shows steady green when the hub is working properly. This light will flash slowly when the hub is searching for devices. Internet connection light: Shows steady green when the hub has connected to the internet (cloud) service. This light will flicker to show activity on the ZigBee or Wi-Fi networks.

Wi-Fi connection light: Shows steady green when the hub is connected to the Wi-Fi. Flashes green slowly to show that the hub is ready to be set up.