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" } } } }
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