I have written the same for my own learning use. It is integrated for camera, doorbell, and thermostat. with triggers for snapshots and pictures inthe device for last chime, person, sound and motion. Also a trigger for last person seen anywhere.
Setup of subscription to NEST events thru PubSub is done within the app itself as well. Same Google SDM fee and terms apply.
Busy tidying up, still some small issues, will share later on.
Examples of setup and device
The app will guide you thru the setup of NEST and GCP setup needed for the app to work…
I will test it straight away. Just out of curiousity; did you find a way to reconnect to pub/sub after a fail (or homey internet disconnection?) I currently solved this by unsubscribing and subscribing every 15 minutes (doesn’t cost anything extra)
I was looking into this as well some time ago. I thought there was a local devices API that doesn’t need a developer fee. Not sure if this was to integrate Nest devices in other eco systems or the other way around, though.
. Alrighty then… I guess I should have payed more attention when read it. Having to pay for it, even a one time payment, just seemed so strange as a user.
Anyhow, I’d love to see an app for this.
I modified a Coolcam door sensor and soldered a 12v relais to the Nest Hello chime module to link the doorbell to Homey . So count me in if you need help testing