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Altera_Forum's avatar
Altera_Forum
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20 years ago

UDP example anyone?

Hi all,

as a newbie with nios II, I am trying to create an application which is capable of receiving UDP-packages. So far it did not work yet. Could anyone give me tips on how to do this. My collegue wrote an application in Delphi which is able to send and receive UDP-packets. He sends them to port 666. I would like to receive these packages and show them in the console.

Could anyone help me out or send me an example? I am working with NIOS II IDE 5.0

Thanks in advance...

Cheers,

Danny

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    20 years ago

    here is:

    # include <sys/types.h># include <sys/socket.h># include <arpa/inet.h># include <stdio.h>

    int main(int argc, char **argv)

    {

    struct sockaddr_in peeraddr, /*IP and socke port*/

    localaddr;/*local socket address*/

    int sockfd;

    char recmsg[BUFLEN+1];

    int socklen, n;

    if(argc!=5){

    printf("%s <dest IP address> <dest port> <source IP address> <source port>\n", argv [0]);

    exit(0);

    }

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    if(sockfd<0){

    printf("socket creating err in udptalk\n");

    exit(1);

    }

    socklen = sizeof(struct sockaddr_in);

    memset(&peeraddr, 0, socklen);

    peeraddr.sin_family=AF_INET;

    peeraddr.sin_port=htons(atoi(argv[2]));

    if(inet_pton(AF_INET, argv[1], &peeraddr.sin_addr)<=0){

    printf("Wrong dest IP address!\n");

    exit(0);

    }

    memset(&localaddr, 0, socklen);

    localaddr.sin_family=AF_INET;

    if(inet_pton(AF_INET, argv[3], &localaddr.sin_addr)<=0){

    printf("Wrong source IP address!\n");

    exit(0);

    }

    localaddr.sin_port=htons(atoi(argv[4]));

    if(bind(sockfd, &localaddr, socklen)<0){

    printf("bind local address err in udptalk!\n");

    exit(2);

    }

    if(fgets(recmsg, BUFLEN, stdin) == NULL) exit(0);

    if(sendto(sockfd, recmsg, strlen(recmsg), 0, &peeraddr, socklen)<0){

    printf("sendto err in udptalk!\n");

    exit(3);

    }

    for(;;){

    /*recv&send message loop*/

    n = recvfrom(sockfd, recmsg, BUFLEN, 0, &peeraddr, &socklen);

    if(n<0){

    printf("recvfrom err in udptalk!\n");

    exit(4);

    }else{

    recmsg[n]=0;

    printf("peer:%s", recmsg);

    }

    if(fgets(recmsg, BUFLEN, stdin) == NULL) exit(0);

    if(sendto(sockfd, recmsg, strlen(recmsg), 0, &peeraddr, socklen)<0){

    printf("sendto err in udptalk!\n");

    exit(3);

    }

    }

    }

    os: uclinux ,
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    20 years ago

    Hi Asaa,

    thank you for your help, but unfortunately my boss doesn&#39;t want to use an OS, so I need one for the stand-alone lwip....

    Cheers,

    Danny