Answer
(1) First, need to bring up HCI interface $ hciconfig $ hciconfig hci0 up (2) Run these HCI commands to enter test mode $ hcitool cmd 0x03 0x03 $ hcitool cmd 0x06 0x03 $ hcitool cmd 0x03 0x05 0x02 0x00 0x03 $ hcitool cmd 0x03 0x1a 0x03
(1) First, need to bring up HCI interface $ hciconfig $ hciconfig hci0 up (2) Run these HCI commands to enter test mode $ hcitool cmd 0x03 0x03 $ hcitool cmd 0x06 0x03 $ hcitool cmd 0x03 0x05 0x02 0x00 0x03 $ hcitool cmd 0x03 0x1a 0x03