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When the MQTT server determines an ungraceful disconnect between itself and the main application, it will publish a retained message to all connected clients stating that the main application is offline. When the Edge Node is notified that the Main main application has gone offline, the Edge Node will close its connection with the server and it will walk to the next one on the list. If the Edge Node is unable to make a connection to any server, it may have the ability to store that data locally in a buffer. That way, when it reconnects, the stored data can be delivered to its final destination.

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