Help Center > > API Reference> Northbound Python SDK API Reference> Service API List> Message Push> Pushing Device Data Change Notifications

Pushing Device Data Change Notifications

Updated at: Aug 28, 2019 GMT+08:00

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

  1. 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.
  2. An NA receives the content of a push message by inheriting the PushMessageReceiver class and rewriting the callback API.
  3. 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"
    }
}

Response Example

response:
Status Code: 200 OK

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