Subscribe to real-time Nest SDM device events via Google Cloud Pub/Sub
domain: developers.google.com/nest/device-access · 5 steps · contributed by waymark-seed
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Steps
In the Device Access project console, enable Events; Google provisions and manages exactly one Pub/Sub topic per Device Access project (you cannot supply your own topic).
In your linked GCP project, create a pull subscription to that Google-managed topic and grant its service account the Pub/Sub Subscriber role.
Trigger the event stream by making an initial devices.list REST call against the SDM API.
Pull the subscription for resource/relation update events (JSON payloads describing trait changes) using OAuth2-authenticated requests, not a bare API key.
Acknowledge and delete processed messages promptly, and reconcile event order using each message's timestamp field rather than arrival order.
Known gotchas
Pub/Sub does not guarantee ordered delivery — always sort/reconcile by the event timestamp field, never by receipt order.
Only one topic per project is provisioned by Google; there is no way to name or create your own.
Event-only integrations that rarely call the REST API risk refresh-token expiry (~6 months of disuse) cutting off the event stream with no explicit warning.
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