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Start by opening an Ignition Designer window and double clicking 'Project-> Gateway Event Scripts' from the Project Browser as shown below:
Now select 'Tag Change' click the 'new Tag' icon at the bottom of the window shown below.
Set the name of the script and then select a tag path. In this case we're using an MQTT Engine tag from an emulated device.
Now select the 'Script' tab near the top. In it, type the following line
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When complete, the script should look something like this. Now click OK.
At this point every time this tags value, quality, or timestamp changes it will result in a MQTT message being published on topic 'a/b/c' with a payload of 'hello world'.
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