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1. Add a line similar to the following to the data/ignition.conf file but replace the 'XX' with the proper index per the wrapper.java.additional statements. This must be done on both the MQTT Transmission side as well as the MQTT Engine side.

   Code Block
   wrapper.java.additional.XX=--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED

   
   

2. Restart Ignition.
3. In the MQTT Transmission configuration, ensure the following is set in MQTT Transmission → Settings → Transmitters
   
4. In the MQTT Engine configuration, ensure the following are set in MQTT Engine → Settings → General
   
5. Set up a tag on the Transmission side with an alarm. Below is an example that will generate an event if the value of the tag goes above 100:
   
6. Trigger the alarm. In this example, we set the value of the memory tag to 101. This resulted in an alarm event at the Edge as shown below in the Alarm Status Table:
   
   
   
7. Because the alarm event was published via MQTT, we can also see it on the Central Gateway running MQTT Engine:
   
   

8. At this point, we can Acknowledge the alarm via the Alarm Status Table by clicking the 'Acknowledge' button as shown below:

   Info
   The alarm can be acknowledged on either the Edge or the Central Gateway side. Once ackowledged, it will be reflected as so on both the Edge and the Central Gateway sides

   
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9. After doing so, you can see the acknowledged alarm on the Central Gateway (MQTT Engine side):
   
10. Finally, you can also see the acknowledged alarm on the Edge (MQTT Transmission side):
    

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