Platform Responding to a Request for Time Synchronization
Function
This API is used by the platform to send a response to the device. The device sending parameter device_send_time is carried. server_recv_time indicates the time when the platform receives the device request. server_send_time indicates the time when the platform sends a response to the device.
Assume that the time when the device receives the response is device_recv_time. The device calculates the accurate time as follows:
(server_recv_time + server_send_time + device_recv_time - device_send_time) / 2
Topic
Topic: $oc/devices/{device_id}/sys/events/down
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_response. |
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 GMT. |
server_recv_time |
Mandatory |
long |
Indicates the timestamp when the platform receives the request. |
server_send_time |
Mandatory |
long |
Indicates the timestamp when the platform sends the response. |
Example
Topic: $oc/devices/{device_id}/sys/events/down Data format: { "object_device_id": "{object_device_id}", "services": [{ "service_id": "$time_sync", "event_type": "time_sync_response", "event_time": "20151212T121212Z", "paras": { "device_send_time": 1582685678789, "server_recv_time": 1582685696152, "server_send_time": 1582685708109 } }] }
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