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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