This is for Windows 10. You need supported bluetooth dongle, refer to cisco documentation. In my tests, I used ASUS BT-400 USB dongle.

Pair your switch to your Windows computer. Default pairing PIN is 9999. Now follow the screenshot bellow:

After the connection is completed, you can SSH to the device via default IP

Bluetooth commands references – in enable mode:

staging config bluetooth on (this will turn on the bluetooth - it's on by default)
staging config bluetooth PIN OLD_PIN NEW_PIN (change default pairing PIN)

Default bluetooth interface is Bluetooth0

For Cisco C9000 series, you need different configuration as described here: