Detect Bluetooth Devices

I recently started using OpenHab and struggle with the Bluetooth bindings.
I have a laptop with an internal bluetooth antenna, and have a delock bluetooth dongle for my PC.
Now, using the bluetooth binding and scanning for devices I expected to see e.g. my smartphone or my bluetooth lamp. But no devices are found.
I don’t want to manually add my phone as a device, because I want to check how many different bluetooth devices are in the room, so I don’t know all devices, and cannot manually add them.
Is there a way to use the bluetooth binding to find available bluetooth devices?