Querying Device Commands

Typical Scenario

After an NA delivers a command to a device, the NA can call this API to query the status and content of the delivered command on the IoT platform to check the command execution status.

API Function

This API is used by an NA to query the status and content of delivered commands on the IoT platform. All the commands delivered by the current application in a specified period or all the commands delivered to a specified device can be queried.

API Description

1	QueryDeviceCommandOutDTO2 queryDeviceCommand(QueryDeviceCommandInDTO2 qdcInDTO, String accessToken) throws NorthApiException

Parameter Description

Parameter	Mandatory or Optional	Type	Location	Description
qdcInDTO	Mandatory	QueryDeviceCommandInDTO2 structure	query	For details, see QueryDeviceCommandInDTO2 structure.
accessToken	Mandatory	String	header	If the Periodically Refreshing a Token API is called, set this parameter to null. Otherwise, set this parameter to the accessToken obtained by the Authentication API.

QueryDeviceCommandInDTO2 structure

Parameter	Mandatory or Optional	Type	Location	Description
pageNo	Optional	Integer(>=0)	query	Indicates the page number. The value is greater than or equal to 0. The default value is 0.
pageSize	Optional	Integer(>=1&&<=1000)	query	Indicates the number of records to be displayed on each page. The value ranges from 1 to 1000. The default value is 1000.
deviceId	Optional	String(64)	query	Identifies the device whose commands are to be queried.
startTime	Optional	String	query	Indicates the start time. Commands delivered later than the start time are queried. The value is in the format of yyyyMMdd'T'HHmmss'Z'. An example value is 20151212T121212Z.
endTime	Optional	String	query	Indicates the end time. Commands delivered earlier than the end time are queried. The value is in the format of yyyyMMdd'T'HHmmss'Z'. An example value is 20151212T121212Z.
appId	Optional	String	query	If the command belongs to the current application, set this parameter to null. Otherwise, set this parameter to the ID of the authorized application.

Response Parameters

QueryDeviceCommandOutDTO2 structure

Parameter	Type	Description
pagination	Pagination	Indicates pagination information. For details, see Pagination structure.
data	List<DeviceCommandRespV4>	Indicates the device command list. For details, see DeviceCommandRespV4 structure.

Pagination structure

Parameter	Type	Description
pageNo	long	Indicates the page number.
pageSize	long	Indicates the number of records to be displayed on each page.
totalSize	long	Indicates the total number of records.

DeviceCommandRespV4 structure

Parameter	Type	Description
commandId	String(1-64)	Identifies a device command.
appId	String(1-64)	Uniquely identifies an NA. This parameter is used to identify an NA that can call open APIs provided by the IoT platform.
deviceId	String(1-64)	Uniquely identifies the device that delivers the command.
command	CommandDTOV4	Indicates information about the delivered command. For details, see CommandDTOV4 structure.
callbackUrl	String(1024)	Indicates the URL for receiving command status change notifications. When the command status changes, such as execution failure, execution success, timeout, sending, or sent, the NA is notified.
expireTime	Integer(>=0)	Indicates the command expiration time, in units of seconds. The command will not be delivered after the specified time elapses. The default validity period is 48 hours (86400 seconds x 2).
status	String	Indicates the status of the command. PENDING: The command has not been delivered. EXPIRED: The command has expired. SUCCESSFUL: The command has been successfully executed. FAILED: The command fails to be executed. TIMEOUT: Command execution times out. CANCELED: The command has been canceled. DELIVERED: The command has been delivered. SENT: The command is being delivered.
result	ObjectNode	Indicates the detailed command execution result.
creationTime	String(20)	Indicates the time when the command is created.
executeTime	String(20)	Indicates the time when the command is executed.
platformIssuedTime	String(20)	Indicates the time when the IoT platform sends the command.
deliveredTime	String(20)	Indicates the time when the command is delivered.
issuedTimes	Integer(>=0)	Indicates the number of times the IoT platform delivers the command.
maxRetransmit	Integer(0-3)	Indicates the maximum number of times the command can be retransmitted.

CommandDTOV4 structure

Parameter	Mandatory or Optional	Type	Description
serviceId	Mandatory	String(1-64)	Identifies the service corresponding to the command.
method	Mandatory	String(1-128)	Indicates the command name.
paras	Optional	Object	Indicates the command parameter, which is a JSON string. The specific format is negotiated by the NA and device.

Error Codes

HTTP Status Code	Error Code	Error Description	Remarks
200	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.
200	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.
200	100418	The deviceData is not existed.	The device data does not exist. Recommended handling: If deviceId carried in the request is incorrect, check whether deviceId belongs to appId or whether deviceId is incorrect. Check whether appId carried in the header contains deviceId. If the URL contains the optional parameter appId, check whether the value of appId is correct.
200	100428	The device is not online.	The device is not online. Recommended handling: Check whether the connection between the device and the IoT platform is normal.
200	100431	The serviceType is not exist.	The service type does not exist. Recommended handling: Check whether the profile file of the device has been uploaded to the IoT platform. Check whether the request parameters are correct and whether serviceId exists in the profile file.
400	100022	The input is invalid.	An input parameter is invalid. Recommended handling: Ensure that neither startTime nor endTime is null and the value of endTime is later than that of startTime. Ensure that pageNo is not null and the value of pageNo is greater than 0. Ensure that pageSize is not null and the value of pageSize is greater than 1.
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	100001	Internal server error.	An internal server error occurs. Recommended handling: An internal error occurs on the IoT platform. Contact IoT platform maintenance personnel.
500	100023	The data in dataBase is abnomal.	The database is abnormal. Recommended handling: An internal error occurs on the IoT platform. Contact IoT platform maintenance personnel.
500	100220	Get AppKey from header failed.	Failed to obtain the appKey. Recommended handling: Check whether appId is carried in the API request header.
500	101016	Get iotws address failed.	Failed to obtain the IoTWS address. Recommended handling: An internal error occurs on the IoT platform. Contact IoT platform maintenance personnel.
500	101017	Get newCallbackUrl from oss failed.	Obtaining a new callback URL from the OSS fails. Recommended handling: An internal error occurs on the IoT platform. Contact IoT platform maintenance personnel.
503	100501	Congestion occurs, and the current network has been flow-controlled	Congestion occurs. The current network is under flow control.