<p>The default MQTT client ID. For a typical device, the thing name is also used as the default MQTT client ID. Although we don’t require a mapping between a thing's registry name and its use of MQTT client IDs, certificates, or shadow state, we recommend that you choose a thing name and use it as the MQTT client ID for the registry and the Device Shadow service.</p> <p>This lets you better organize your IoT fleet without removing the flexibility of the underlying device certificate model or shadows.</p>

<p>The current version of the thing record in the registry.</p> <note> <p>To avoid unintentional changes to the information in the registry, you can pass the version information in the <code>expectedVersion</code> parameter of the <code>UpdateThing</code> and <code>DeleteThing</code> calls.</p> </note>