---
title: IOBluetoothUserNotificationCallback
framework: IOBluetooth
role: symbol
role_heading: Type Alias
path: iobluetooth/iobluetoothusernotificationcallback
---

# IOBluetoothUserNotificationCallback

Callback function definition for user notifications.

## Declaration

```swift
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

Return Value None.

## Discussion

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