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 } }] }
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