RE : [lwip-users] missing something but what

[Frédéric BERNON]

Hi Julian,

 

You should got a "internal" (since it doesn't seems to return a error code) during the bind operation, since you try to bind your sock to a multicast address (which is a wrong idea).

 

If you only need to send mutlicast, you can bind to any addr/port, like this:

 

addr.sin_family = AF_INET;

addr.sin_port = htons(INADDR_ANY);

addr.sin_addr.s_addr = htonl(INADDR_ANY);

 

and next, change the IP address to the multicast group you want.

 

addr.sin_addr.s_addr = htonl( (239<<24)|(255<<16)|(255<<8)|(250)); /* be sure of your byte-order */

 

Regards

 

 

====================================
Frédéric BERNON
HYMATOM SA
Chef de projet informatique
Microsoft Certified Professional
Tél. : +33 (0)4-67-87-61-10
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Email : address@hiddenr
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P Avant d'imprimer, penser à l'environnement

 

-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Julian Gardner [RSD]
Envoyé : vendredi 20 juillet 2007 14:26
À : address@hidden
Objet : [lwip-users] missing something but what

I have a small problem and cant work out what i am doing wrong.

I have stripped out the code to this and this hangs in udp_sendto waiting on a mbox

int sock;
int >int err;
struct sockaddr_in addr;

        memset(&addr, 0, sizeof(addr));
        addr.sin_family          = AF_INET;
        addr.sin_addr.s_addr = htonl( (239<<24)|(255<<16)|(255<<8)|(250));
        addr.sin_port            = 50050;

        sock = socket(PF_INET, SOCK_DGRAM, 0);
//    err = setsockopt( sock, SOL_SOCKET, SO_REUSEADDR, (char *) &onBool, sizeof (int));
        err = bind( sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
        err = sendto( sock, "Hello", 5, 0, (struct sockaddr *)&addr, sizeof( addr));
        closesocket( sock);

Any ideas, as i get no errors, also port 239.255.255.250 is opened as multicast but i am not even getting data to be passed to the ethernet chip.

joolz

Frédéric BERNON.vcf
Description: Frédéric BERNON.vcf