Connect me 9210 Udp Multicasting

Embedded Devices NET+OS
, ,
1

Hello there

I am working on Digi Connect Me 9210

What I want to do is very simple, I have a multicast device and I need to receive the udp packets from this device, so ‘udp multicasting receiver’ but I cannot join the range that is multicasting by the device.

mreq.imr_multiaddr.s_addr = NAInet_addr (VALUE_MULTICAST_POINTER);
mreq.imr_interface.s_addr = INADDR_ANY;

new_CallStatus = setsockopt (new_multi_server_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) & mreq, sizeof (mreq));

new_CallStatus always return -1;

So what should I think?

  1. Connect me 9210 doesn’t support multicasting?
  2. Is there a logical error in the code I wrote?
  3. Should i go another way to enable multicasting on Connect me 9210?

new_multi_server_sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(new_multi_server_sock<0){
perror("Socket Creation Failed
");
return ;
}
new_CallStatus=setsockopt(new_multi_server_sock,SOL_SOCKET,SO_REUSEADDR,(const char *)&new_optval,sizeof(int));
if(new_CallStatus<0){
perror("Setsockopt Failed
");
return ;
}
new_CallStatus=setsockopt(new_multi_server_sock,SOL_SOCKET,SO_RCVBUF,(char *)&new_sockbufsize,sizeof(int));
if(new_CallStatus<0){
perror("Setsockopt Failed
");
return ;
}
new_multi_portno=INTVAL_MULTICAST_PORT_NUMBER;
memset((char *)&new_multi_server_addr,0,sizeof(new_multi_server_addr));
new_multi_server_addr.sin_family=AF_INET;
new_multi_server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
new_multi_server_addr.sin_port=htons((unsigned short)new_multi_portno);

    new_CallStatus=bind(new_multi_server_sock,(struct sockaddr *)&amp;new_multi_server_addr,sizeof(new_multi_server_addr));
    if(new_CallStatus&lt;0){
    	perror("New Creation Socket for multicasting cannot binding the port

");
return ;
}
else{
printf("New Creation Multicasting socket successfuly binding the port so socket ready to read
");
}

       mreq.imr_multiaddr.s_addr = NAInet_addr(VALUE_MULTICAST_POINTER);
       mreq.imr_interface.s_addr = INADDR_ANY;

   new_CallStatus=setsockopt(new_multi_server_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,(char *)&amp;mreq,sizeof(mreq));
   if(new_CallStatus&lt;0){
	   return ;
   }
   else{
	   printf("success");
   }
2

Not sure if this is your problem or not, but one of the things I had to learn the hard way, is that some stacks require the source gateway address to be valid for source network (even if there is no gateway on the network). The Treck stack used by Net/OS does indeed require a gateway ip specified and valid, or multicast will not work. Strange, I know, but that’s how it works. Took me a ton of time to figure this out.