DATA_CHAR_1
{ BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 },
pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);