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Abstract
This page describes how MQTT Engine and MQTT Transmission configurations interact using the Ignition Security Context to inhibit write commands to tags by unauthorized users.
When using Ignition Security context, the user authorization is encrypted and included with the published write event message from MQTT Engine. At MQTT Transmission, if the user is authorized to write to the tag, this results in a successful write, and the tag change is published. If the user is not authorized to write to the tag, there is no action taken.
Review the Standard Tag Properties table for details on setting the Security property.
In the Ignition Gateway web UI, navigate to the MQTT Engine Settings in the left side bar. From the Main tab, set the following elements in the Command Setting section.
In the Ignition Gateway web UI, navigate to the MQTT Transmission Settings in the left side bar. From the Transmitters tab, for each transmitter set the following elements in the Command Setting section.
Select the Security Context Hashing Algorithm algorithm to use when decrypting the Security Context.