Device Property Update

This topic is used to subscribe to updates on end device properties.

Topic

$hw/events/device/{device_id}/updated

Parameter	Type	Description
device_id	String	End device ID.

Usage

Use an MQTT client to subscribe to this topic.

Parameter Description

Parameter	Type	Description
event_id	String	Event ID.
timestamp	Int64	Timestamp when the event occurred.
attributes	Object	A set of updated end device properties, which are in the key-value pair format. The key indicates the property name, the value contains the property value and the optional flag, and metadata contains the value type.

Example

When an end device is bound to an edge node, the following message is received:

$hw/events/device/{device_id}/updated
{
     "event_id":"",
     "timestamp":1557314742136,
     "attributes":{
         "address":{
             "value":"shenzhen",
             "optional":true,
             "metadata":{
                 "type":"string"
             }
         }
     }
 }