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

system.cirruslink.engine.publish("Chariot SCADA", "a/b/c", str("hello world").encode(), 0, 0)

Note, the form of the publish method is as follows.  You may need to change the method arguments based on your configuration:

system.cirruslink.engine.publish(String serverName, String mqttTopic, byte[] payload, int qos, boolean retain)

Where:

• 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'.