Allows a client to register for L2CAP channel open notifications for any L2CAP channel.
- macOS 10.6+
The callback to be called when a new L2CAP channel is opened.
Client-supplied refCon to be passed to the callback.
Returns an IOBluetoothUserNotificationRef representing the outstanding L2CAP channel notification. To unregister the notification, call IOBluetoothUserNotificationUnregister() with the returned IOBluetoothUserNotificationRef. If an error is encountered creating the notification, NULL is returned. The returned IOBluetoothUserNotificationRef will be valid for as long as the notification is registered. It is not necessary to retain the result. Once the notification is unregistered, it will no longer be valid.
The given callback will be called whenever any L2CAP channel is opened.