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 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.