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What is a Device ID and a Client ID?

A Device ID is a unique identifier for a device. It is used in calls to the IoT API to designate a specific device.
It must also be used as the MQTT Client Identifier field during connection.
If your software doesn’t have a setting for Client ID, you can use the Device ID in the Username field instead. If no Device ID is found in the client ID field, but it is present in the Username field, the one used in the Username field will be used as the Client ID.
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