I set up an UDP socket. With Wireshark I can see everthing works as expected.
even ARP works according the timeout and retry settings.
sending a message to a existing node it arrives. processing time only a few milli seconds.
adressing a not xisting Node does take even longer. the function call to sendto returns exactly after the timeout/retry period.
broadcast messages are also possible, without the need of a ARP interaction. great!
BUT, there is not flag indicating the timeout occured. I expected the Sn_IR register will set bit 3 (Sn_IR), but i does not.
the find out whether a adressed node is existing can only be done by measuring the time until the function terminated?
do anybody know where I find the right flag?