Hello everybody,
I'm in need to program a datagram-based application for the very first
time in my life, and since I haven't found
very good documentation how to perform this on lwIP stack, I've decided
to seek advice once again from more
experienced programmers; I've already had good experiences in seeking
answers from here :)
Anyway, as I understand, usually initializing UDP socket is done somehow
like this:
serversocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
server.sin_family = AF_INET;
server.sin_port = htons( server_port );
inet_aton( server_ip, & server.sin_addr );
.
. // some other code here, and then calling eventually
wri_length = sendto( serversocket, server_msg, strlen ( server_msg ),
0, (struct sockaddr *) & server, sizeof ( server) );
But obviously it's not meant to be used like this in lwIP. The sendto(
)-function described above hangs completely, and normal
send doesn't either seem to do very well, because the peer server
doesn't receive anything. Is this proper way or have I got it all
wrong? Or am I supposed to call functions defined in udp.c directly?
Best regards,
M. Repo, Helsinki, Finland
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