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Docs › Connecting devices › Establishing a connection › Device onboarding › Success and failure callbacks

Success and failure callbacks

Success

If the register operation is successful and Device Management Client can register all the Resources to Device Management Connect, the application receives the result through the on_status_changed callback.
```
    MbedCloudClient::on_status_changed(void(*fn)(void));
```
Failure

If the registration operation fails, you receive the result through the error callback:
```
    MbedCloudClient::on_error(void(*fn)(int));
```

The error parameter passed with the callback contains more information on the error; use it to fix the problem.

You can see the mapped status codes in the MbedCloudClient::Status enum. You can see the mapped error codes in the MbedCloudClient::Error enum.

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