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

Downstream: $oc/devices/{device_id}/sys/events/down

Parameters

ServiceEvent structure

paras structure

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
         } 
    }] 
}