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MQTT Store and Forward allows data to be buffered locally at a client when connections are down to the MQTT Server infrastructure and deliver that data when the connection is restored. This feature is critical in most applications because if we lose connection to the MQTT Server we will lose data if it is not buffered locally.
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When Store and Forward is configured at MQTT Transmission and the edge node detects a disconnect to the MQTT Server, tags will be stored locally in a history store. When the edge node can reconnect to the MQTT Server, it will publish any stored tags.
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MQTT Engine has two methods of historical event processing resulting in historical inserts into Ignition’s Tag Historian Module.
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