bt_devreq
int bt_devreq(int, struct bt_devreq *, time_t);
bt__devreq(int s, struct bt_devreq *req, time_t t_end)
bt_devreq(int s, struct bt_devreq *req, time_t to)
struct bt_devreq req;
if (bt_devreq(hci, &req, 10) == -1)