Dears

I wrote these two small programs to help debug a problem that I think I have found when using urtwn driver in a baglebone black. The problem is 100% reproducible.


In a server machine I run:

serverUDP 2508

In beaglebone black I run:

./clientUDP servername 2508 9216 0

All the times, after some packages be sent the urtwn interface do not respond from ping and stops send others packages. Some times this error message appears:

% urtwn0: device timeout

I have tested with RTL8192CU and RTL8188CUS

The problem do no occurs in my notebook.

Following the server and client

#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>

#define BUFFER_LEN    1024*1024

void diep(char *s)
{
    perror(s);
    exit(1);
}

int main(int argc, char **argv)
{
    int lidos;
    struct sockaddr_in si_me, si_other;
    int s, i, slen=sizeof(si_other);
    char buf[BUFFER_LEN];
    int aux;

    if(argc != 2){
        fprintf(stderr, "Voce deve usar %s <porta>\n", argv[0]);
        exit(1);
    }

    if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
        diep("socket");

    memset((char *) &si_me, 0, sizeof(si_me));
    si_me.sin_family = AF_INET;
    si_me.sin_port = htons(strtol(argv[1], (char **)NULL, 10));
        si_me.sin_addr.s_addr = htonl(INADDR_ANY);
        if (bind(s, (struct sockaddr *)&si_me, sizeof(si_me))==-1)
            diep("bind");

    i = 1;
        do {
if ((lidos = recvfrom(s, buf, BUFFER_LEN, 0, (struct sockaddr *)&si_other, (socklen_t *)&slen))==-1)
            diep("recvfrom()");
        aux = ntohl(*(int*)&buf[0]);
printf("Perdidos %d pacotes (%0.2f%%)\n", aux - i, 100*((float)(aux - i))/((float)aux));
        printf("Sequencia %0000d Recebidos %d bytes\n", aux, lidos);
        i++;
    }while(lidos>0);

    close(s);
    return 0;
}

#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/select.h>

#define SOCKET_ERROR    -1
#define INVALID_SOCKET    -1

#define SRV_IP "127.0.0.1"

void diep(char *s)
{
        perror(s);
    exit(1);
}


int main(int argc, char **argv)
{
    struct sockaddr_in si_other;
    int s, i, slen=sizeof(si_other);
    char *buf;
    int tamanho;
    int npack;
    struct addrinfo *result = NULL,
                    *ptr = NULL,
                    hints;
    int iResult, aux;
    fd_set fdset;

    if(argc != 5){
fprintf(stderr,"Voce deve usar %s <host> <porta> <tamanho> <numero de pacotes>\n", argv[0]);
        exit(1);
    }

    tamanho        = (int)strtol(argv[3], (char **)NULL, 10);
    npack        = (int)strtol(argv[4], (char **)NULL, 10);

    buf = malloc(tamanho);

    bzero(&hints, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_DGRAM;
    hints.ai_protocol = IPPROTO_UDP;

    iResult = getaddrinfo(argv[1], argv[2], &hints, &result);
    if ( iResult != 0 ) {
            printf("getaddrinfo failed with error: %d\n", iResult);
        return 1;
    }

    // Attempt to connect to an address until one succeeds
    for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {

        // Create a SOCKET for connecting to server
        s = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
        if (s < 0){
            perror("socket");
            return 1;
           }

           // Connect to server.
           iResult = connect(s, ptr->ai_addr, (int)ptr->ai_addrlen);
           if (iResult == SOCKET_ERROR) {
            close(s);
            s = INVALID_SOCKET;
               continue;
           }

           break;
    }

    freeaddrinfo(result);
    FD_ZERO(&fdset);
    FD_SET(s, &fdset);
    for (i=1; i<=npack || npack==0; i++) {
        aux = htonl(i);
        memcpy(&buf[0], &aux, sizeof(aux));
        aux = htonl(npack);
        memcpy(&buf[0+sizeof(i)], &aux, sizeof(aux));
        do{
            if(select(s+1, NULL, &fdset, NULL, NULL )<0)
                diep("select()");
        }while(!FD_ISSET(s, &fdset));
        if (send(s, buf, tamanho, 0)==-1)
            diep("sendto()");
    }
    printf("Enviados %d pacotes de %d bytes\n", npack, tamanho);

    close(s);
    return 0;
}
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