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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:

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Now select 'Tag Change' click the 'new Tag' icon at the bottom of the window shown below.

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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.

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Now select the 'Script' tab near the top.  In it, type the following line

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• serverName: The server name as shown in the MQTT Engine Settings configuration shown below
• mqttTopic: The MQTT Topic to publish on
• payload: The MQTT payload
• qos: The MQTT quality of service to publish on
• retain: Whether or not to set the retain flag in the MQTT message

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When complete, the script should look something like this.  Now click OK.

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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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