Bluetooth

The stack

drivers/bluetooth/: HCI (driver_bt_hci.c), H4 transport (driver_bt_h4.c), L2CAP, RFCOMM, SDP, SPP (serial profile), HID (input devices), and USB-attached controllers (driver_bt_usb.c).

Command

oc> bt    (controller status, inquiry, services)

Bring-up

HCI transport init (H4 UART or USB dongle), controller reset, then L2CAP/RFCOMM channels for SPP. The layered tests run through bt.