Pushing Device Data Change Notifications

Typical Scenario

After an NA subscribes to device data change notifications (the notification type is deviceDataChanged) on the IoT platform, the IoT platform sends a notification message to the NA when the device reports data of a single service attribute.

API Function

This API is used by the IoT platform to push notification messages to an NA that has subscribed to device data change notifications.

Note

When Subscribing to Service Data of the IoT Platform, an NA must subscribe to the specified callback address in the API description. The server and port in the callback address are the public IP address and specified port of the NA server.
An NA receives the content of a push message by inheriting the PushMessageReceiver class and rewriting the callback API.
If the callback address is not the address of the NA, the NA must implement the original callback API. For details on the API content, see Message Push in the Huawei IoT Platform Northbound API Reference.

API Description

Callback URL	https://server:port/v1.0.0/messageReceiver
Callback API	def handleDeviceDataChanged(self)
Class	PushMessageReceiver

Parameter Description

The input parameter is request.json.

Parameter	Mandatory or Optional	Type	Location	Description
nddcDTO	Mandatory	NotifyDeviceDataChangedDTO	body	For details, see NotifyDeviceDataChangedDTO structure.

NotifyDeviceDataChangedDTO structure

Parameter	Mandatory or Optional	Type	Location	Description
notifyType	Mandatory	String	body	Indicates the notification type. The value is deviceDataChanged.
requestId	Optional	String(1-128)	body	Indicates the sequence number of the message, which uniquely identifies the message.
deviceId	Mandatory	String	body	Uniquely identifies a device.
gatewayId	Mandatory	String	body	Uniquely identifies a gateway.
service	Mandatory	DeviceService	body	Indicates service data of the device. For details, see DeviceService structure.

DeviceService structure

Parameter	Mandatory or Optional	Type	Location	Description
serviceId	Mandatory	String	body	Identifies a service.
serviceType	Mandatory	String	body	Indicates the service type.
data	Mandatory	ObjectNode	body	Indicates service data information.
eventTime	Mandatory	String	body	Indicates the event occurrence time in the format of yyyymmddThhmissZ, for example, 20151212T121212Z.

Response Parameters

Status Code: 200 OK

Request Example

Method: POST
request: {callbackUrl}
Header:
Content-Type:application/json
Body:
{
    "notifyType":"deviceDataChanged",
    "requestId":"*************",
    "deviceId":"********************************",
    "gatewayId":"*************",
    "service":{
        "serviceId":"Brightness",
        "serviceType":"Brightness",
        "data":{
            "brightness":80
        },
        "eventTime":"20170311T163657Z"
    }
}