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You will see the result of MQTT Engine seeing a new edge node and device connect to the MQTT Server and publish an NBIRTH and DBIRTH message.  As a result, MQTT Engine created the Ignition Tags shown above.  These are also dynamically updated as the values change.  You can also write to the outputs after you Enable Device Writes from Ignition.  This can be done by putting designer into read/write mode.  Do so by clicking this button in the menu to enable read/write mode:

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