Updated on 2023-02-16 GMT+08:00

Device Requesting Time Synchronization

Function

This API is used by a device to send a request for synchronizing time with the platform.

Topic

Topic: $oc/devices/{device_id}/sys/events/up

Parameters

Parameter

Mandatory or Optional

Type

Description

object_device_id

Optional

String

Indicates the device that the event is about. If this parameter is not carried, the device specified in the topic is considered to be the device involved.

services

Optional

List<ServiceEvent>

Indicates a list of services that the event is about.

ServiceEvent structure

Parameter

Mandatory or Optional

Type

Description

service_id

Mandatory

String

System field. The value is fixed to $time_sync.

event_type

Mandatory

String

System field. The value is fixed to time_sync_request.

event_time

Optional

String

Indicates the time when the event occurs.

paras

Mandatory

Object

Indicates the event parameters in JSON format.

paras structure

Parameter

Mandatory or Optional

Type

Description

device_send_time

Mandatory

long

Indicates the timestamp when the device sends the request. The timestamp is the number of milliseconds since 00:00:00 on January 1, 1970 in Greenwich Mean Time (GMT).

Example

Topic: $oc/devices/{device_id}/sys/events/up  
Data format:
{ 
    "object_device_id": "{object_device_id}", 
    "services": [{ 
        "service_id": "$time_sync", 
        "event_type": "time_sync_request", 
        "event_time": "20151212T121212Z",
         "paras": { 
            "device_send_time": 1582685678789
         } 
    }] 
}