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Let's take a look at a an example of how a UNS can be created at MQTT Engine from Edge Node tags published by MQTT Transmission.


Tip

Review the MQTT Transmission Transmitters and Tag Trees to gain an understanding of how MQTT Transmission Transmitter configurations interact with Ignition tag trees to publish Sparkplug messages and the immense flexibility that can be realized.


We have configured an MQTT Transmission Transmitter to use the Ignition tag tree in the default tag provider at the Edge to construct the Sparkplug Device Descriptor (group_id, edge_id and device_id) starting at the folder level below Edge Nodes.

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However, these tag properties are used by UNS Transmitter to create the .props message associated with the tag. Any refresh of the edge node at the UNS Transmitter will result in a .props message being published with the edited Sparkplug Descriptor properties.

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In addition to creating the UNS folder, for each connected Edge Node, a Node Control and Node Info folder containing tags is created along with a Device Info folder for each connected device. See the Engine Tags documentation for details on each of these tags.

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