UDMI / Docs / Messages / Envelope
Schema Definition: config.json
The UDMI envelope is not a message itself, but the attributes and other information that
is delivered along with a message. There is no direct awareness of it at the device level: it is
added and manipulated in the back-end only. Primarily based on the
Cloud IoT Core message attributes.
From the device side, the subFolder property of the MQTT topic is passed along to the message
envelope, which allows the back-end to properly categorize and process data. A device does not need
to do anything other than specify the correct subFolder postfix of the MQTT topic.