Using a dual mode bluetooth 4.0 usb device (bcm20702?) I am trying to set the inquiry tx power in Linux (Ubuntu 14.04) - using the command e.g.
sudo hciconfig hci0 inqtpl 1
The command is succesful according to hcidump but the hciconfig inqtpl always reads back zero.
Is this beacse a) the plugable device firmware is not configured to use this hci command or b) this command is only avaiable onthe UARt and not USB c) other?