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Greengrass is a normal AWS IoT Thing, so all the regular MQTT limits imposed by IoT Core do apply in the same way.
Greengrass v2 has a message spooler for saving messages while offline. I'd recommend that you have a look at the Nucleus component configuration here: https://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-nucleus-component.html#greengrass-nucleus-component-configuration specifically the "spooler" section. It allows you to configure the amount of messages to keep (by bytes) and whether to keep or drop QoS 0 messages. Currently the spooler is only in-memory, so if Greengrass restarts the messages will still be lost.
Cheers,
Michael Dombrowski
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