Hcitool

$ hcitool dev
## to see if the Device was detected

$ hcitool scan
## to see if the Device is able to do anything, got an error:
Device is not available: No such device

# hciconfig hci0 up
## to power on the device, got an error:
Can't init device hci0: Device or resource busy (16)

# hciconfig hci0 piscan
Can't set scan mode on hci0: Network is down (100)

# hciconfig hci0 reset
Can't init device hci0: Device or resource busy (16)