C web service request in VM linux C not response

-1 down vote favorite I am working with a Linux based box which does video control. I need to add partial ONVIF support so that it can support multiple cameras with the same interface. I started writing code on my Windows development machine using virtual Linux environment, and succeeded in making some basic requests that got answered. However, I had to cheat a little. I didn't see a way with CURL to make the original WS-Discovery; to skip that part at the beginning, I listened to ONVIF manager with Wireshark, looked at the results of the WS-Discovery there, and took the results as the start of my program. Now I started to work backwards, and implement the WS-discovery. It seems pretty straightforward and I found several samples of C code. For example, I tried this: [login to view URL] and others. (Basically, open a socket, bind it to a port, set the options to allow broadcast, send it to a broadcast address, and see the results come in). However, no matter how I have written it, not only don't I get any responses - I cannot see the request being sent on Wireshark. Nothing happens. Even though all functions return successfully (opening socket, binding, option setting, sending, etc..) - nothing comes out. Now, ONVIF manager manages to send these packets - but from the Windows machine, not the Linux virtual machine. I thought that that might be the issue - but the other code I wrote which sends to specific addresses worked fine from the virtual machine (using the IP address which belongs to both the Windows host and the Linux VM). Here is one of the last samples I tested: /* * build instructions * * gcc -o bclient bclient.c * * Usage: * ./bclient <serverport> */ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #define MAXBUF 65536 const char *data = "<s:Envelope xmlns:s=\"[login to view URL]\" xmlns:a=\"[login to view URL]\"><s:Header><a:Action s:mustUnderstand=\"1\">[login to view URL]</a:Action><a:MessageID>uuid:2c7722b3-ae7d-475c-b89d-0d1885784b9f</a:MessageID><a:ReplyTo><a:Address>[login to view URL]</a:Address></a:ReplyTo><a:To s:mustUnderstand=\"1\">urn:schemas-xmlsoap-org:ws:2005:04:discovery</a:To></s:Header><s:Body><Probe xmlns=\"[login to view URL]\"><d:Types xmlns:d=\"[login to view URL]\" xmlns:dp0=\"[login to view URL]\">dp0:NetworkVideoTransmitter</d:Types></Probe></s:Body></s:Envelope>"; int main(void) { int sock, status, buflen, sinlen; char buffer[MAXBUF]; struct sockaddr_in sock_in; int yes = 1; sinlen = sizeof(struct sockaddr_in); memset(&sock_in, 0, sinlen); buflen = MAXBUF; sock = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); sock_in.sin_addr.s_addr = htonl(INADDR_ANY); sock_in.sin_port = htons(0); sock_in.sin_family = PF_INET; status = bind(sock, (struct sockaddr *)&sock_in, sinlen); printf("Bind Status = %d\n", status); status = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(int) ); printf("Setsockopt Status = %d\n", status); sock_in.sin_addr.s_addr=inet_addr("[login to view URL]"); sock_in.sin_port = 3207; /* port number */ sock_in.sin_family = PF_INET; sprintf(buffer,"%s", data); buflen = strlen(buffer); status = sendto(sock, buffer, buflen, 0, (struct sockaddr *)&sock_in, sinlen); printf("sendto Status = %d\n", status); shutdown(sock, 2); close(sock); That runs, each function reports success - and nothing is sent. what I am missing? Need solution asap