我基本上试图读取Raspberry Pi(我的客户端)上的加速计数据并将它们发送到服务器(EC2 ubuntu实例)。亚马逊EC2套接字编程(C)
这是我的客户端代码:
#include "./sensor.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 4) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
int delay = atoi(argv[3]);
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
int acc[6];
enableIMU();
while(1){
bzero(buffer,256);
readACC(acc);
sprintf(buffer,"%d\t%d\t%d\t\n", acc[0], acc[1], acc[2]);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
}
close(sockfd);
return 0;
}
这里是我的服务器代码:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno;
socklen_t clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
n = write(newsockfd,"I got your message",18);
if (n < 0) error("ERROR writing to socket");
close(newsockfd);
close(sockfd);
return 0;
}
我把这个命令行我的客户,看看我的加速度计读数:
./client ec2-54-187-93-10.us-west-2.compute.amazonaws.com 8000
然后我把这条线放在我的服务器上,什么也看不到:
./server 8000
这是安全组我的实例:
Type Protocol Port Range Source
HTTP TCP 80 0.0.0.0/0
Custom TCP Rule TCP 8000 0.0.0.0/0
SSH TCP 22 0.0.0.0/0
你知道我在做什么错?我将衷心感谢您的帮助。
建议您使用调试器或向代码中添加一些更基本的调试语句以帮助您追踪执行情况。例如,当服务器成功接受连接时,甚至没有调试打印。 – kaylum
服务器和客户端彼此是本地的,它似乎工作正常。这很可能是一方或另一方的防火墙问题。 – dbush