It appears that there is some sort of incompatibility between SmartThings and Google Nest’s API that makes it impossible to use smartapps currently. I came to this conclusion because:
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When I looked for code for the Nest thermostat’s device handler, not only could I not find any, but I also couldn’t find any smartapps that currently work with it.
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I found this in the forums:
Nest Thermostat with Groovy SmartApp -
I looked up a how-to on integrating with Nest and the guy in the video specifically says that Nest currently doesn’t support SmartThings smartapps:
I don’t have any Google devices myself so I can’t really verify any of this, but it looks pretty solid. If you have some information to the contrary, let me know and I’ll try to work around any issues that I can.
Sorry for the bad news.