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

Releasing Data

API Function

This API is used by the gateway to release data of directly connected devices or indirectly connected devices to the IoT platform. In data releasing, users can select topics for the released data, which is not supported in data reporting. In addition, the JSON character strings need to be assembled by the developer and transferred to the API. The SDK is used only for transparent transmission.

API Description

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mqttDataPub(int cookie, String topic, int qos, byte[] serviceData);

Class

DataTransService

Parameter Description

Parameter

Mandatory or Optional

Type

Description

uiCookie

Optional

int

The value ranges from 1 to 65535.

pucTopic

Mandatory

String

Specifies the topic of the released data.

uiQos

Mandatory

int

Specifies the value of MQTT. Default value: 1

pbstrServiceData

Mandatory

byte[]

Specifies the packet body of the released data.

Return Value

Return Value

Description

true

Success

false

Failure

NOTE:

Return values only show API calling results. For example, the return value true indicates that the API is called successfully but does not indicate that the service data is released successfully. The service data is released successfully only after the DataTransService broadcast is received.

Example

Call this API to release data.

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DataTransService. mqttDataPub(1211, "/huawei/v1/devices/336d9bac-9ebf-44e9-95cf-efac5f05da3a/services/Storage", 1, bstrBody);

Implement the observer API provided by the AgentLite before calling this API.

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public class Subscribe implements MyObserver {
    public Subscribe (Observable dataTransService) {
        dataTransService. registerObserver (this);
    }
    @Override
    public void update(IotaMessage arg0) {
        // TODO Auto-generated method stub
System.out.println ("AgentLiteDataTrans receives a notification:" + arg0)
        int mMsgType = arg0.getMsgType();
        switch(mMsgType) {
//Receive a data reporting response.
            case IodevService.IODEV_MSG_DATA_REPORT_RSP:
            getDataReportAnswer(arg0);
            break;
//Receive a command passively.
            case IodevService.IODEV_MSG_RECEIVE_CMD:
            getCmdReceive(arg0);
            break;
//MQTT message push
            case IodevService.IODEV_MSG_MQTT_PUB_RSP:
            //logoutResultAction(iotaMsg);
            break;
            case IodevService.IODEV_MSG_MQTT_SUB_RSP:
            //TopicSubcribeResultAction(iotaMsg);
            break;
            case IodevService.IODEV_MSG_MQTT_DATA_RECV_RSP:
            //DataRecvAction(iotaMsg);
            break;
            default:
            break;
        }
    }
close