Dave W wrote:
It's a bad design if ON and OFF codes are the same. Interference
occurring during an ON or OFF would reverse subsequent switchings.

On the other hand, they support multi-way switching so I'm not sure how
else you could do it. If you've got three switches, and switch 1 sends
"up", the controller doesn't know whether to turn on or off unless it
knows the state of switches 2 and 3 (which it would have to store, as
the switches are unpowered unless you're pressing one - and missing an
event would make the stored state wrong). If every switch just sends
"change" when it's pressed, multi-way switching works as expected
without needing the controller to store the switch state. The function
would be clearer if it was a push-button rather than a rocker switch
(in fact there's a fob version that is), but they've obviously tried
to make it look as much like a conventional switch as possible.

Mike