List devices

hciconfig
hciconfig hci0 version

Bring interface up | down

sudo hciconfig hci0 up
hciconfig
sudo hciconfig hci1 down
hciconfig

Display/set interface name

hciconfig hci0 name
sudo hciconfig hci0 name MyBlueToothDevice
hciconfig hci0 name

Set/unset device discoverable and connection acceptance

hciconfig hci0
sudo hciconfig hci0 piscan
hciconfig hci0
sudo hciconfig hci0 noscan
hciconfig hci0 

scanning/device discovery

• Brief (MAC and Name)

hcitool -i hci0 scan

• Detailed, includes device class

hcitool -i hci0 scan --info --class

set device class

hciconfig hci0 class
sudo hciconfig hci0 class 0x??????
hciconfig hci0 class

BT stack debugging

Let command run

while you perform other BT activity

hcidump -X -i hci0