Query a Device

Function

This API is used by an application to query the details of a specific device on the IoT platform.

Debugging

You can debug this API through automatic authentication in API Explorer or use the SDK sample code generated by API Explorer.

URI

GET /v5/iot/{project_id}/devices/{device_id}

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Parameter description: project ID. For details about how to obtain the project ID, see Obtaining a Project ID.
device_id	Yes	String	Parameter description: device ID, which uniquely identifies a device. The value of this parameter is specified during device registration or allocated by the platform. If the value is allocated by the platform, the value is in the format of [product_id][node_id]. Value: The value can contain a maximum of 128 characters. Only letters, digits, underscores (), and hyphens (-) are allowed.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	No	String	Parameter description: user token. You can obtain the token by calling the IAM API Obtaining a User Token Through Password Authentication. X-Subject-Token in the response header returned by the API is the desired user token. For details about how to obtain the token, see Token Authentication.
Instance-Id	No	String	Parameter description: instance ID. Unique identifier of each instance in the physical multi-tenant scenario. Mandatory for professional editions and recommended in other cases. Log in to the IoTDA console and choose Overview in the navigation pane to view the instance ID. For details, see Viewing Instance Details.

Response Parameters

Status code: 200

**Table 3** Response body parameters
Parameter	Type	Description
app_id	String	Resource space ID.
app_name	String	Resource space name.
device_id	String	Device ID, used to uniquely identify a device. The value of this parameter is specified during device registration or allocated by the platform. If the value is allocated by the platform, the value is in the format of [product_id]_[node_id].
node_id	String	Device identifier. This parameter is set to the IMEI, MAC address, or serial number.
gateway_id	String	Gateway ID, which is the device ID of the parent device. The gateway ID is the same as the device ID if the device is a directly connected device. If the device is an indirectly connected device, the gateway ID is the device ID of the directly connected device with which it associates.
device_name	String	Device name.
node_type	String	Device node type. ENDPOINT: an indirectly connected device. GATEWAY: a directly connected device or gateway. UNKNOWN: The device node type is unknown.
description	String	Device description.
fw_version	String	Firmware version of the device.
sw_version	String	Software version of the device.
device_sdk_version	String	Device SDK information.
auth_info	AuthInfoRes object	Access authentication information about the device.
product_id	String	Unique ID of the product associated with the device.
product_name	String	Name of the product associated with the device.
status	String	Device status. ONLINE: The device is online. OFFLINE: The device is offline. ABNORMAL: The device is abnormal. INACTIVE: The device is not activated. FROZEN: The device is frozen.
create_time	String	Time when the device was registered on the platform. The value is in the format of yyyyMMdd'T'HHmmss'Z', for example, 20151212T121212Z.
connection_status_update_time	String	Time of the last device connection status change. Such statuses include ONLINE, OFFLINE, and ABNORMAL. The value is in the format of yyyy-MM-dd'T'HH:mm:ss.SSS'Z', for example, 2015-12-12T12:12:122Z.
active_time	String	Time when a device was activated. The value is in the format of yyyy-MM-dd'T'HH:mm:ss.SSS'Z', for example, 2015-12-12T12:12:122Z.
tags	Array of TagV5DTO objects	List of device tags.
extension_info	Object	Extended device information, which can be customized. If this parameter is specified for a child device during device creation, the platform will notify the gateway of the extended information using the MQTT API for notifying a gateway of new child device connection.

**Table 4** AuthInfoRes
Parameter	Type	Description
auth_type	String	Parameter description: authentication type. If auth_type is not specified, the secret authentication is used. Options: SECRET: The secret authentication is used. CERTIFICATES: The certificate authentication is used.
secret	String	Parameter description: device secret. This parameter is mandatory when auth_type is set to SECRET. Note: Due to protocol restrictions, NB-IoT device secrets must be hexadecimal values. This parameter is not returned when you query a device list. Value: The value can contain 8 to 32 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed.
secondary_secret	String	Parameter description: secondary device secret used when the master secret fails to pass the authentication. This parameter is valid when auth_type is set to SECRET. Unavailable for devices accessed using CoAP. Note: Due to protocol restrictions, NB-IoT device secrets must be hexadecimal values. This parameter is not returned when you query a device list. Value: The value can contain 8 to 32 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed.
fingerprint	String	Parameter description: certificate fingerprint. This parameter is valid when auth_type is set to CERTIFICATES. If this parameter is not specified during device registration, the certificate fingerprint used during the first device access is used. Value: The value is a string of 40 or 64 hexadecimal characters.
secondary_fingerprint	String	Parameter description: secondary certificate fingerprint used when the master fingerprint fails to pass the authentication. This parameter is valid when auth_type is set to CERTIFICATES. Value: The value is a string of 40 or 64 hexadecimal characters.
secure_access	Boolean	Parameter description: whether the device is connected to the platform using a secure protocol. Options: true: The device is connected to the platform using a secure protocol. false: The device is connected to the platform using an insecure protocol. Devices connected to the platform using insecure protocols may be spoofed. You are advised not to use this value.
timeout	Integer	Parameter description: validity period for device access, in seconds. The default value is 0. If the device has not been connected to the IoT platform and activated within the validity period, the IoT platform deletes the registration information of the device. If this parameter is set to 0 (recommended), the platform does not delete the device registration information. Note: This parameter is only available for directly connected devices.

**Table 5** TagV5DTO
Parameter	Type	Description
tag_key	String	Parameter description: tag key, which is unique for a resource. If the specified key already exists, the value of the existing tag is overwritten. If the specified key does not exist, a new tag is added. Value: The value can contain a maximum of 64 characters. Only letters, digits, underscores (_), periods (.), and hyphens (-) are allowed.
tag_value	String	Parameter description: tag value. Value: The value can contain a maximum of 128 characters. Only letters, digits, underscores (_), periods (.), and hyphens (-) are allowed.

Example Requests

Queries details about a specified device.

GET https://{endpoint}/v5/iot/{project_id}/devices/{device_id}

Example Responses

Status code: 200

{
  "app_id" : "jeQDJQZltU8iKgFFoW060F5SGZka",
  "app_name" : "testAPP01",
  "device_id" : "d4922d8a-6c8e-4396-852c-164aefa6638f",
  "node_id" : "ABC123456789",
  "gateway_id" : "d4922d8a-6c8e-4396-852c-164aefa6638f",
  "device_name" : "dianadevice",
  "node_type" : "ENDPOINT",
  "description" : "watermeter device",
  "fw_version" : "1.1.0",
  "sw_version" : "1.1.0",
  "auth_info" : {
    "auth_type" : "SECRET",
    "secret" : "3b935a250c50dc2c6d481d048cefdc3c",
    "fingerprint" : "dc0f1016f495157344ac5f1296335cff725ef22f",
    "secure_access" : true,
    "timeout" : 0
  },
  "product_id" : "b640f4c203b7910fc3cbd446ed437cbd",
  "product_name" : "Thermometer",
  "status" : "ONLINE",
  "create_time" : "20190303T081011Z",
  "connection_status_update_time" : "2019-03-03T08:10:111Z",
  "active_time" : "2019-03-03T08:10:111Z",
  "tags" : [ {
    "tag_key" : "testTagName",
    "tag_value" : "testTagValue"
  } ],
  "extension_info" : {
    "aaa" : "xxx",
    "bbb" : 0
  }
}