I've just picked up one of these which looks interesting
It's a Sonoff switch but the interesting bits are it's natively Hue compatible and, as well as being controlled through the Hue app, can also work with a normal lightswitch (or other form of switch). The two light grey terminals connect to a switch so you can switch it on and off and that will also change the state for Hue or whatever.
I've just picked up one of these which looks interesting
It's a Sonoff switch but the interesting bits are it's natively Hue compatible and, as well as being controlled through the Hue app, can also work with a normal lightswitch (or other form of switch). The two light grey terminals connect to a switch so you can switch it on and off and that will also change the state for Hue or whatever.