test_skpair_connect_poll
ret = test_skpair_connect_poll(sk, this_ip_dest, port, cnt_expected, &sk_pair);
ret = test_skpair_connect_poll(sk, this_ip_dest, port, 0, &sk_pair);
ret = test_skpair_connect_poll(sk, this_ip_dest, port, 0, &sk_pair);