Are ethernet or wifi door switches available that work with ST?

Thanks–most Home automation manufacturers call those “contact sensors” if they are based on a two piece device with a magnet in one piece and a reed sensor on the other. Some call them “door/window” sensors.

These aren’t WiFi, but the Cao Gadgets Kumo Wireless tags have a contact sensor (they call theirs a “reed sensor”) with excellent range and two ways of integrating with SmartThings. The sensor itself is $39. You will also need the $39 Ethernet bridge (one bridge for each 40 sensors).

They have their own IFTTT channel, so you can get integration that way, or there is a community created cloud to cloud integration.

Manufacturer site:

IFTTT channel:

SmartThings integration:

Other options

You can build your own WiFi sensor for about $10 and connect it through IFTTT

Monnit has a WiFi door sensor for about $60, but to get integration you have to also buy their professional monitoring option so that you can send an email to IFT TT. A couple of years ago, that was a good option, but now I think you’re better off with either the wireless tag or even building your own.

DLink had a nice WiFi motion sensor with an ifttt channel, but no contact sensor.