i´m trying to set up communication per udp between a pc and an embedded control board based on a renesas rx65n.
on the embedded control board (10.222.187.10) i open an udp socket on port 1230.
on pc (10.222.5.123) i also open an udp socket on port 1230.
if i send udp telegrams from pc to control board, i receive telegrams on control board (see receive_udp_filtered.pcapng).
if i send upd telegrams from control board to pc, i don´t receive telegrams on pc, but telegrams are on wire (see send_udp_filtered.pcapng).
on wireshark files i can see one difference between the protocols:
- telegrams from control board don´t set the identification field in internet protocol (see ip.png)
- telegrams from pc set the identification field, each further telegram increments identification field
i don´t know if identification field is the problem, but is there a way to activate this counter?
if i use two pc programs i can send and receive telegrams and i can see in wireshark files that identification field is incremented each in both directions.