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Hi Tom,
Greengrass only has a single MQTT broker which is optional, aws.greengrass.clientdevices.mqtt.Moquette. The "internal" broker which I believe you are referring to is accessed using Greengrass IPC calls subscribeToIotCore and publishToIotCore. These calls are IPC calls and are not using the MQTT protocol directly (there is no MQTT broker involved on the local Greengrass device for these calls).
When using the MQTT broker provided by Greengrass which is aws.greengrass.clientdevices.mqtt.Moquette, you can use any MQTT client not just the AWS IoT Device SDK.
You may use the component aws.greengrass.clientdevices.mqtt.Bridge in order to bridge data on topics between IoT Core, local MQTT (Moquette Broker), and Greengrass local pubsub (subscribeToTopic/publishToTopic).
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