The device index is the number that appears at the beginning of the three lines describing each device. In this example, the index of the Bluetooth device is 1, while the index of the GPS device is 2. Yours are probably different.
0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hci0: Bluetooth Soft blocked: yes Hard blocked: no 2: gps0: GPS Soft blocked: no Hard blocked: no