sdp_open
void * sdp_open (bdaddr_t const *l, bdaddr_t const *r);
ss = sdp_open(&info->laddr, &info->raddr);
if ((ss = sdp_open(local, remote)) == NULL)
if ((ss = sdp_open(local, &hd->bdaddr)) == NULL)
ss = sdp_open(&local_bdaddr, &remote_bdaddr);
xs = sdp_open(NG_HCI_BDADDR_ANY, bdaddr);