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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define DEST_PORT 50000
#define CLIENT_ADDRESS "192.168.1.233"
#define DSET_IP_ADDRESS "192.168.1.255"
int main()
{
/* socket文件描述符 */
int sock_fd_client;
/* 建立udp socket */
sock_fd_client = socket(AF_INET, SOCK_DGRAM, 0);
if(sock_fd_client < 0)
{
perror("socket");
exit(1);
}
int on = 1;
setsockopt(sock_fd_client, SOL_SOCKET, SO_REUSEADDR|SO_BROADCAST, &on, sizeof(on));
struct sockaddr_in addr_client;
addr_client.sin_family = AF_INET;
addr_client.sin_port = htons(50000);
addr_client.sin_addr.s_addr = inet_addr(CLIENT_ADDRESS);
/* 绑定socket */
if(bind(sock_fd_client, (struct sockaddr *)&addr_client, sizeof(addr_client)) < 0)
{
perror("bind error:");
exit(1);
}
/* 设置address */
struct sockaddr_in addr_serv;
int len;
memset(&addr_serv, 0, sizeof(addr_serv));
addr_serv.sin_family = AF_INET;
addr_serv.sin_port = htons(DEST_PORT);
addr_serv.sin_addr.s_addr = inet_addr(DSET_IP_ADDRESS);
len = sizeof(addr_serv);
int send_num;
int recv_num;
char send_buf[10] = {0};
char recv_buf[4096] = {0};
printf("send the Query frame for quering wid all\n");
send_buf[0] = 'Q';
send_buf[1] = 0xAA;
send_buf[2] = 0x06;
send_buf[3] = 0x00;
send_buf[4] = 0xFE;
send_buf[5] = 0x7F;
printf("send buff len: %d\n", strlen(send_buf));
send_num = sendto(sock_fd_client, send_buf, 6, 0, (struct sockaddr *)&addr_serv, len);
if(send_num < 0)
{
perror("sendto error:");
exit(1);
}
printf("waiting for server reply...\n");
recv_num = recvfrom(sock_fd_client, recv_buf, sizeof(recv_buf), 0, (struct sockaddr *)&addr_serv, (socklen_t *)&len);
if(recv_num < 0)
{
perror("recvfrom error:");
exit(1);
}
recv_buf[recv_num] = '\0';
printf("client receive %d\n", recv_num);
int i;
for(i=0; i<recv_num; i++)
{
printf("%x ", *(recv_buf+i));
}
printf("\n");
close(sock_fd_client);
return 0;
}