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# IOBluetoothUserNotificationCallback

Callback function definition for user notifications.

```
typealias IOBluetoothUserNotificationCallback = (UnsafeMutableRawPointer?, IOBluetoothUserNotificationRef?, IOBluetoothObjectRef?) -> Void
```

## Parameters

`userRefCon`

(void *) This user defined parameter was provided during the original call to register the notification.

`inRef`

(IOBluetoothUserNotificationRef) The notification responsible for sending the notification.

`status`

(IOBluetoothObjectRef) The object that originated the notification.

## Return Value

None.

## Discussion

This callback will be invoked when the notification for which it was registered is sent.

---

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