CameraPerson Schema

Nest Cam (legacy) Nest Cam (outdoor or indoor, battery) Nest Cam with floodlight Nest Cam (indoor, wired) Nest Hub Max Nest Doorbell (legacy) Nest Doorbell (battery) Nest Doorbell (wired) 


This trait belongs to any device that supports person detection events.


There are no fields available for this trait.


There are no commands available for this trait.




A person has been detected by the camera.

This event supports updateable notifications. Existing app notifications created from this event can be updated using the content of an subsequent event with the same eventThreadId.

Person event


  "eventId" : "aca5bbe6-51d7-49bd-b2e4-ac1ac9cf34c8",
"timestamp" : "2019-01-01T00:00:01Z",
"resourceUpdate" : { "name" : "enterprises/project-id/devices/device-id", "events" : { "" : { "eventSessionId" : "CjY5Y3VKaTZwR3o4Y19YbTVfMF...", "eventId" : "PJfXeRCMY6jLbZWDqi0qA93T1L...", } } } "userId" : "AVPHwEuBfnPOnTqzVFT4IONX2Qqhu9EJ4ubO-bNnQ-yi",
"eventThreadId" : "d67cd3f7-86a7-425e-8bb3-462f92ec9f59",
"eventThreadState" : "STARTED",
"resourceGroup" : [ "enterprises/project-id/devices/device-id" ] }

Person event fields

Field Description Data Type
eventSessionId Nest Doorbell (battery) Nest Doorbell (wired) An ID given to events occurring as part of a single session of related events. May be used for consolidating events.

Use it to associate this event with the related ClipPreview event of the CameraClipPreview trait.

Example: "CjY5Y3VKaTZwR3o4Y19YbTVfMF..."
eventId Nest Cam (legacy) Nest Hub Max Nest Doorbell (legacy) An ID associated with the event.

Use it with the GenerateImage command to download the camera image related to this event.

Example: "PJfXeRCMY6jLbZWDqi0qA93T1L..."

Event payload fields

Field Description Data Type
eventId The unique identifier for the event. string
Example: "aca5bbe6-51d7-49bd-b2e4-ac1ac9cf34c8"
timestamp The time when the event occurred. string
Example: "2019-01-01T00:00:01Z"
resourceUpdate An object that details information about the resource update. object
userId A unique, obfuscated identifier that represents the user. string
Example: "AVPHwEuBfnPOnTqzVFT4IONX2Qqhu9EJ4ubO-bNnQ-yi"
eventThreadId Updateable The unique identifier for the event thread. string
Example: "d67cd3f7-86a7-425e-8bb3-462f92ec9f59"
eventThreadState Updateable The state of the event thread. string
resourceGroup An object that indicates resources that might have similar updates to this event. The resource of the event itself (from the resourceUpdate object) will always be present in this object. object

See Events for more information on the different types of events and how they work.


The following error code(s) may be returned in relation to this trait:

Error Message RPC Troubleshooting
Camera image is no longer available for download. DEADLINE_EXCEEDED Event images expire 30 seconds after the event is published. Make sure to download the image prior to expiration.
Event id does not belong to the camera. FAILED_PRECONDITION Use the correct eventID returned by the camera event.

See the API Error Code Reference for the full list of API error codes.