Hello @Red255 ,
Unfortunately as of today there isn't a way to connect your brownfield MQTT devices directly to IoTHub, since the topics they use do not match with the prerequisites described in Understand Azure IoT Hub MQTT support | Microsoft Learn.
After making a successful connection, a device can send messages to IoT Hub using devices/{device_id}/messages/events/ or devices/{device_id}/messages/events/{property_bag} as a Topic Name.
May I request you to please log this feature request on the product feedback page: Microsoft Azure | Share your Ideas | Azure IoT (Hub, DPS, SDKs)
The product group does monitor the request and they can plan for the implementation in the future. Once you log the feature request you will also be notified of the status of the request. We invite you to keep using this forum and motivate others to do the same. You can always help other community members by answering their queries.
Thank you!
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