REST Resource: projects.locations.registries.devices

Resource: Device

The device resource.

JSON representation
{
  "id": string,
  "name": string,
  "numId": string,
  "credentials": [
    {
      object(DeviceCredential)
    }
  ],
  "lastHeartbeatTime": string,
  "lastEventTime": string,
  "lastStateTime": string,
  "lastConfigAckTime": string,
  "lastConfigSendTime": string,
  "blocked": boolean,
  "lastErrorTime": string,
  "lastErrorStatus": {
    object(Status)
  },
  "config": {
    object(DeviceConfig)
  },
  "state": {
    object(DeviceState)
  },
  "logLevel": enum(LogLevel),
  "metadata": {
    string: string,
    ...
  },
  "gatewayConfig": {
    object(GatewayConfig)
  }
}
Fields
id

string

The user-defined device identifier. The device ID must be unique within a device registry.

name

string

The resource path name. For example, projects/p1/locations/us-central1/registries/registry0/devices/dev0 or projects/p1/locations/us-central1/registries/registry0/devices/{numId}. When name is populated as a response from the service, it always ends in the device numeric ID.

numId

string

[Output only] A server-defined unique numeric ID for the device. This is a more compact way to identify devices, and it is globally unique.

credentials[]

object(DeviceCredential)

The credentials used to authenticate this device. To allow credential rotation without interruption, multiple device credentials can be bound to this device. No more than 3 credentials can be bound to a single device at a time. When new credentials are added to a device, they are verified against the registry credentials. For details, see the description of the DeviceRegistry.credentials field.

lastHeartbeatTime

string (Timestamp format)

[Output only] The last time an MQTT PINGREQ was received. This field applies only to devices connecting through MQTT. MQTT clients usually only send PINGREQ messages if the connection is idle, and no other messages have been sent. Timestamps are periodically collected and written to storage; they may be stale by a few minutes.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

lastEventTime

string (Timestamp format)

[Output only] The last time a telemetry event was received. Timestamps are periodically collected and written to storage; they may be stale by a few minutes.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

lastStateTime

string (Timestamp format)

[Output only] The last time a state event was received. Timestamps are periodically collected and written to storage; they may be stale by a few minutes.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

lastConfigAckTime

string (Timestamp format)

[Output only] The last time a cloud-to-device config version acknowledgment was received from the device. This field is only for configurations sent through MQTT.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

lastConfigSendTime

string (Timestamp format)

[Output only] The last time a cloud-to-device config version was sent to the device.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

blocked

boolean

If a device is blocked, connections or requests from this device will fail. Can be used to temporarily prevent the device from connecting if, for example, the sensor is generating bad data and needs maintenance.

lastErrorTime

string (Timestamp format)

[Output only] The time the most recent error occurred, such as a failure to publish to Cloud Pub/Sub. This field is the timestamp of 'lastErrorStatus'.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

lastErrorStatus

object(Status)

[Output only] The error message of the most recent error, such as a failure to publish to Cloud Pub/Sub. 'lastErrorTime' is the timestamp of this field. If no errors have occurred, this field has an empty message and the status code 0 == OK. Otherwise, this field is expected to have a status code other than OK.

config

object(DeviceConfig)

The most recent device configuration, which is eventually sent from Cloud IoT Core to the device. If not present on creation, the configuration will be initialized with an empty payload and version value of 1. To update this field after creation, use the DeviceManager.ModifyCloudToDeviceConfig method.

state

object(DeviceState)

[Output only] The state most recently received from the device. If no state has been reported, this field is not present.

logLevel

enum(LogLevel)

The logging verbosity for device activity. If unspecified, DeviceRegistry.log_level will be used.

metadata

map (key: string, value: string)

The metadata key-value pairs assigned to the device. This metadata is not interpreted or indexed by Cloud IoT Core. It can be used to add contextual information for the device.

Keys must conform to the regular expression [a-zA-Z][a-zA-Z0-9-_.+~%]+ and be less than 128 bytes in length.

Values are free-form strings. Each value must be less than or equal to 32 KB in size.

The total size of all keys and values must be less than 256 KB, and the maximum number of key-value pairs is 500.

An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.

gatewayConfig

object(GatewayConfig)

Gateway-related configuration and state.

DeviceCredential

A server-stored device credential used for authentication.

JSON representation
{
  "expirationTime": string,
  "publicKey": {
    object(PublicKeyCredential)
  }
}
Fields
expirationTime

string (Timestamp format)

[Optional] The time at which this credential becomes invalid. This credential will be ignored for new client authentication requests after this timestamp; however, it will not be automatically deleted.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

publicKey

object(PublicKeyCredential)

A public key used to verify the signature of JSON Web Tokens (JWTs). When adding a new device credential, either via device creation or via modifications, this public key credential may be required to be signed by one of the registry level certificates. More specifically, if the registry contains at least one certificate, any new device credential must be signed by one of the registry certificates. As a result, when the registry contains certificates, only X.509 certificates are accepted as device credentials. However, if the registry does not contain a certificate, self-signed certificates and public keys will be accepted. New device credentials must be different from every registry-level certificate.

PublicKeyCredential

A public key format and data.

JSON representation
{
  "format": enum(PublicKeyFormat),
  "key": string
}
Fields
format

enum(PublicKeyFormat)

The format of the key.

key

string

The key data.

PublicKeyFormat

The supported formats for the public key.

Enums
UNSPECIFIED_PUBLIC_KEY_FORMAT The format has not been specified. This is an invalid default value and must not be used.
RSA_PEM An RSA public key encoded in base64, and wrapped by -----BEGIN PUBLIC KEY----- and -----END PUBLIC KEY-----. This can be used to verify RS256 signatures in JWT tokens ([RFC7518]( https://www.ietf.org/rfc/rfc7518.txt)).
RSA_X509_PEM As RSA_PEM, but wrapped in an X.509v3 certificate ([RFC5280]( https://www.ietf.org/rfc/rfc5280.txt)), encoded in base64, and wrapped by -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----.
ES256_PEM

Public key for the ECDSA algorithm using P-256 and SHA-256, encoded in base64, and wrapped by -----BEGIN PUBLIC KEY----- and -----END PUBLIC KEY-----. This can be used to verify JWT tokens with the ES256 algorithm (RFC7518). This curve is defined in OpenSSL as the prime256v1 curve.

ES256_X509_PEM As ES256_PEM, but wrapped in an X.509v3 certificate ([RFC5280]( https://www.ietf.org/rfc/rfc5280.txt)), encoded in base64, and wrapped by -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----.

Status

The Status type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by gRPC. The error model is designed to be:

  • Simple to use and understand for most users
  • Flexible enough to meet unexpected needs
Overview

The Status message contains three pieces of data: error code, error message, and error details. The error code should be an enum value of google.rpc.Code, but it may accept additional error codes if needed. The error message should be a developer-facing English message that helps developers understand and resolve the error. If a localized user-facing error message is needed, put the localized message in the error details or localize it in the client. The optional error details may contain arbitrary information about the error. There is a predefined set of error detail types in the package google.rpc that can be used for common error conditions.

Language mapping

The Status message is the logical representation of the error model, but it is not necessarily the actual wire format. When the Status message is exposed in different client libraries and different wire protocols, it can be mapped differently. For example, it will likely be mapped to some exceptions in Java, but more likely mapped to some error codes in C.

Other uses

The error model and the Status message can be used in a variety of environments, either with or without APIs, to provide a consistent developer experience across different environments.

Example uses of this error model include:

  • Partial errors. If a service needs to return partial errors to the client, it may embed the Status in the normal response to indicate the partial errors.

  • Workflow errors. A typical workflow has multiple steps. Each step may have a Status message for error reporting.

  • Batch operations. If a client uses batch request and batch response, the Status message should be used directly inside batch response, one for each error sub-response.

  • Asynchronous operations. If an API call embeds asynchronous operation results in its response, the status of those operations should be represented directly using the Status message.

  • Logging. If some API errors are stored in logs, the message Status could be used directly after any stripping needed for security/privacy reasons.

JSON representation
{
  "code": number,
  "message": string,
  "details": [
    {
      "@type": string,
      field1: ...,
      ...
    }
  ]
}
Fields
code

number

The status code, which should be an enum value of google.rpc.Code.

message

string

A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.

details[]

object

A list of messages that carry the error details. There is a common set of message types for APIs to use.

An object containing fields of an arbitrary type. An additional field "@type" contains a URI identifying the type. Example: { "id": 1234, "@type": "types.example.com/standard/id" }.

GatewayConfig

Gateway-related configuration and state.

JSON representation
{
  "gatewayType": enum(GatewayType),
  "gatewayAuthMethod": enum(GatewayAuthMethod),
  "lastAccessedGatewayId": string,
  "lastAccessedGatewayTime": string
}
Fields
gatewayType

enum(GatewayType)

Indicates whether the device is a gateway.

gatewayAuthMethod

enum(GatewayAuthMethod)

Indicates how to authorize and/or authenticate devices to access the gateway.

lastAccessedGatewayId

string

[Output only] The ID of the gateway the device accessed most recently.

lastAccessedGatewayTime

string (Timestamp format)

[Output only] The most recent time at which the device accessed the gateway specified in last_accessed_gateway.

A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds. Example: "2014-10-02T15:01:23.045123456Z".

GatewayType

Gateway type.

Enums
GATEWAY_TYPE_UNSPECIFIED If unspecified, the device is considered a non-gateway device.
GATEWAY The device is a gateway.
NON_GATEWAY The device is not a gateway.

GatewayAuthMethod

The gateway authorization/authentication method. This setting determines how Cloud IoT Core authorizes/authenticate devices to access the gateway.

Enums
GATEWAY_AUTH_METHOD_UNSPECIFIED No authentication/authorization method specified. No devices are allowed to access the gateway.
ASSOCIATION_ONLY The device is authenticated through the gateway association only. Device credentials are ignored even if provided.
DEVICE_AUTH_TOKEN_ONLY The device is authenticated through its own credentials. Gateway association is not checked.
ASSOCIATION_AND_DEVICE_AUTH_TOKEN The device is authenticated through both device credentials and gateway association. The device must be bound to the gateway and must provide its own credentials.

Methods

create

Creates a device in a device registry.

delete

Deletes a device.

get

Gets details about a device.

list

List devices in a device registry.

modifyCloudToDeviceConfig

Modifies the configuration for the device, which is eventually sent from the Cloud IoT Core servers.

patch

Updates a device.

sendCommandToDevice

Sends a command to the specified device.
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Cloud IoT Core Documentation