Querying Service Capabilities of a Device

Updated on 2022-02-24 GMT+08:00

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Typical Scenario

If an NA needs to know which service attributes can be reported by a device and which commands can be delivered to the device, the NA can call this API to query the device service capabilities defined in the profile file of the device on the IoT platform.

API Function

This API is used by an NA to query device service capabilities, such as service attributes and device commands.

API Description

1	def queryDeviceCapabilities(self, qdcInDTO, accessToken)

Parameter Description

Parameter	Mandatory or Optional	Type	Location	Description
qdcInDTO	Mandatory	QueryDeviceCapabilitiesInDTO	query	For details, see QueryDeviceCapabilitiesInDTO structure.
accessToken	Mandatory	String	header	This parameter is set to the value of the access token obtained by calling the Authentication API.

QueryDeviceCapabilitiesInDTO structure

Parameter	Mandatory or Optional	Type	Location	Description
gatewayId	Optional	String	query	Identifies a gateway.
appId	Mandatory	String	query	If the device belongs to the current application, set this parameter to None. Otherwise, set this parameter to the ID of the authorized application.
deviceId	Optional	String	query	Uniquely identifies a device.

Response Parameters

QueryDeviceCapabilitiesOutDTO

Parameter	Type	Description
deviceCapabilities	List<DeviceCapabilityDTO>	Indicates the query result list. For details, see DeviceCapabilityDTO structure.

DeviceCapabilityDTO structure

Parameter	Type	Description
deviceId	String(256)	Uniquely identifies a device.
serviceCapabilities	List<ServiceCapabilityDTO>	Indicates the service capability list. For details, see ServiceCapabilityDTO structure.

ServiceCapabilityDTO structure

Parameter	Type	Description
serviceId	String(256)	Identifies a service.
serviceType	String(256)	Indicates the service type.
option	String(256)	Indicates a service option.
description	String(10240)	Indicates the service description.
commands	List<ServiceCommand>	Indicates the supported commands. For details, see ServiceCommand structure.
properties	List<ServiceProperty>	Indicates the attribute list. For details, see ServiceProperty structure.

ServiceCommand structure

Parameter	Type	Description
commandName	String(256)	Indicates the command name.
paras	List<ServiceCommandPara>	Indicates the attribute list. For details, see ServiceCommandPara structure.
responses	List<ServiceCommandResponse>	Indicates the response list. For details, see ServiceCommandResponse structure.

ServiceCommandPara structure

Parameter	Type	Description
paraName	String(256)	Indicates the parameter name.
dataType	String(256)	Indicates the data type.
required	Boolean	Indicates whether the parameter is mandatory.
min	String	Indicates the minimum value of the attribute.
max	String	Indicates the maximum value of the attribute.
step	Double	Indicates the step.
maxLength	Integer	Indicates the maximum length.
unit	String	Indicates the unit (symbol).
enumList	List<String>	Indicates the enumeration type list.

ServiceCommandResponse structure

Parameter	Type	Description
responseName	String(256)	Indicates the response name.
paras	List<ServiceCommandPara>	Indicates the attribute list. For details, see ServiceCommandPara structure.

ServiceProperty structure

Parameter	Type	Description
propertyName	String(256)	Indicates the attribute name.
dataType	String(256)	Indicates the data type.
required	Boolean	Indicates whether the parameter is mandatory.
min	String	Indicates the minimum value of the attribute.
max	String	Indicates the maximum value of the attribute.
step	Double	Indicates the step.
maxLength	Integer	Indicates the maximum length.
method	String(256)	Indicates the access method. The values are as follows: R: Readable W: Writable E: Observable
unit	String	Indicates the unit (symbol).
enumList	List<String>	Indicates the enumeration type list.

Error Codes

HTTP Status Code	Error Code	Error Description	Remarks
400	100022	The input is invalid.	An input parameter is invalid. Recommended handling: Check whether parameters carried in the API call request are valid.
403	100203	The application is not existed.	The application does not exist. Recommended handling: Check whether appId carried in the HTTP request header is correct. Check whether appId in the request path (URL) is correct.
403	100217	The application hasn't been authorized.	The application has not been authorized. Recommended handling: In scenarios where applications are not authorized, ensure that request parameter appId is null.
403	1010009	app throttle exceed.	The NA calls the API at a frequency that exceeds the flow control threshold (100 calls per minute by default). Recommended handling: Contact IoT platform maintenance personnel to adjust the flow control threshold or control the API call frequency.
403	1010005	App_key or access_token is invalid.	The access token is invalid. Recommended handling: Check whether accessToken carried in the API request is correct.
500	100203	The application is not existed.	The application does not exist. Recommended handling: Check whether appId carried in the HTTP request header is correct. Check whether appId in the request path (URL) is correct.
500	50252	Internal server error.	An internal server error occurs. Recommended handling: An internal error occurs on the IoT platform. Contact IoT platform maintenance personnel.