Hi,Lewis.
Sorry for delay in response.
I created sample Qt application that uses core part (BluetoothPlugin class) of our integration with Plantronics SDK.
In attached archive (password - "plantronics") you could find both Qt project source and built (under VS 2008 compiler) release binary.
This sample application doesn't receive any DeviceStateChange events at all.
Please, tell me if something is wrong/missed in SDK initialization etc.
Regards, Viktor.