Find the device on the network

Could someone please explain to me how to find a device on a network - use the multicast or broadcast?

I want to find the ip address of my server on wlan and there may be multiple instances of these servers. The server uses this http://www.blackberry.com/developers/docs/7.0.0api/net/rim/device/api/io/MulticastDatagramConnection... class and receives repsonses ok. Java then sends a rear channel.

I get only the following c ++ side while I'm hoping to receive a string any (that im sending java) so I can identify what responses come from my server. and which are not.

M-SEARCH * HTTP/1.1
HOST: 239.255.255.250:1900
St:urn:schemas - upnp - org:device:InternetGatewayDevice:1
MAN: "" ssdp: discover ""
MX:3

And here is my code to send and receive...

int receiveMulti()
{
     struct sockaddr_in addr;
     int fd, nbytes,addrlen;
     struct ip_mreq mreq;
     char msgbuf[1024];

     u_int yes=1;            /*** MODIFICATION TO ORIGINAL */

     /* create what looks like an ordinary UDP socket */
     if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
      perror("socket");
      exit(1);
     }

/**** MODIFICATION TO ORIGINAL */
    /* allow multiple sockets to use the same PORT number */
    if (setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0) {
       perror("Reusing ADDR failed");
       exit(1);
       }
/*** END OF MODIFICATION TO ORIGINAL */

     /* set up destination address */
     memset(&addr,0,sizeof(addr));
     addr.sin_family=AF_INET;
     addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
     addr.sin_port=htons(1900);

     /* bind to receive address */
     if (bind(fd,(struct sockaddr *) &addr,sizeof(addr)) < 0) {
      perror("bind");
      exit(1);
     }

     /* use setsockopt() to request that the kernel join a multicast group */
     mreq.imr_multiaddr.s_addr=inet_addr("239.255.255.250");
     mreq.imr_interface.s_addr=htonl(INADDR_ANY);
     if (setsockopt(fd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0) {
      perror("setsockopt");
      exit(1);
     }
     printf("beforeread");
     fflush(stdout);
     bool keepGoing = true;
     int count = 0;
     /* now just enter a read-print loop */
     while (keepGoing) {
         count++;
      addrlen=sizeof(addr);
      if ((nbytes=recvfrom(fd,msgbuf,1024,0,
                   (struct sockaddr *) &addr,(socklen_t*)&addrlen)) < 0) {
           perror("recvfrom");
           exit(1);
      }
      msgbuf[nbytes] = '\0';
      printf("received: %d  %s", nbytes, msgbuf);
      fflush(stdout);
      if(count > 5)
      {
          break;
      }
     }
}

int sendMulti ()
{
     struct sockaddr_in addr;
     int fd, cnt;
     struct ip_mreq mreq;
     char *message="83383329092240912";

     /* create what looks like an ordinary UDP socket */
     if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
      perror("socket");
      exit(1);
     }

     /* set up destination address */
     memset(&addr,0,sizeof(addr));
     addr.sin_family=AF_INET;
     addr.sin_addr.s_addr=inet_addr("239.255.255.250");
     addr.sin_port=htons(1900);

     /* now just sendto() our destination! */
    // while (1)
     {
      if (sendto(fd,message,sizeof(message),0,(struct sockaddr *) &addr,
             sizeof(addr)) < 0) {
           perror("sendto");
           exit(1);
      }
      sleep(1);
     }
}

tjhanks.

It turns out that my hypothesis the code example I used sends the group with this line of code is incorrect...

String remoteAddr = dgram.getAddress();
   String msg = "Hi";

   dgram = conn.newDatagram( msg.getBytes(), msg.length(), remoteAddr);

remoteAddr gives me //192.168.0.5:65228;4321| rear UDP I used to send the data back to c ++ but when I just changed my group address and port manaually packets are received on the side of c ++.

Tags: BlackBerry Developers

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