【触觉智能 Purple Pi开发板试用】TCP通信实例之一

Purple Pi开发板的特色是路由器，今天从头书写一个tcp通信的实例。
1、查找资料，搜索arm-linux tcp通信。网上的资料非常多，这里学习了https://blog.csdn.net/yishuicanhong/article/details/80639957这位大佬的作品。
2、建立sever服务端，先定义服务端端口：3861，最大连入端户端数量：10，代码如下：

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

#define SERVER_PORT 3861
#define LISENT_NUM 10

int main(int argc, char * argv[])
{
    int sfd, cfd;
    struct sockaddr_in clientaddr;
    struct sockaddr_in serverAddr;
    char buff[1024];
    int size = sizeof(struct sockaddr);
    pthread_t client_thread[LISENT_NUM];

    if((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
    {
        perror("socket");
        exit(-1);
    }

    memset(&serverAddr, 0, sizeof(struct sockaddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = INADDR_ANY;
    serverAddr.sin_port = htons(SERVER_PORT);

    if (bind(sfd, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr)) == -1)
	{
		perror("bind");
		close(sfd);
		exit(-1);
    }
    if(listen(sfd, LISENT_NUM) == -1)
    {
        perror("listen");
        close(sfd);
        exit(-1);
    }

    printf("#@ listen SERVER_PORT %d\n", SERVER_PORT);
    printf("main: server waiting connect...\n");

    if ((cfd = accept(sfd, (struct sockaddr *)&clientaddr, (socklen_t*)&size)) == -1)
	{
		perror("accept");
		close(sfd);
		return 0;
	}
    printf("client (ip = %s : SERVER_PORT = %d) connect success\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));

    while (1)
    {
        usleep(1000*10);
        if (send(cfd, "hello Purple Pi", 6, MSG_NOSIGNAL) == -1)
        {
            perror("send");
            exit(-1);
        }
        printf("send: hello Purple Pi\n");
        usleep(1000*10);
        if(recv(cfd, buff, sizeof(buff), 0) == -1)
        {
            perror("recv");
            exit(-1);
        }
        printf("receive: %s\n", buff);
    }
    return 0;

}

编译后上传给开发板：

3、编写客户端连接tcp_client.c:

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

#define SERVER_PORT 2828

int main(int argc, char * argv[])
{
    int sockfd, len;
    char buff[1024];
    struct sockaddr_in clientAddr;
    struct sockaddr_in serverAddr;

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("socket");
        exit(-1);
    }

    memset(&serverAddr, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = inet_addr("192.168.43.134");
    serverAddr.sin_port = htons(SERVER_PORT);

    printf("connect server %s: %d\n", inet_ntoa(serverAddr.sin_addr), SERVER_PORT);

    if(connect(sockfd, (struct sockaddr *)&serverAddr, sizeof(struct sockaddr)) == -1)
    {
        perror("connect");
        exit(-1);
    }
    printf("connect success!\n");

    while (1)
    {
        send(sockfd, "hello Purple Pi client", 6, 0);
        len = recv(sockfd, buff, sizeof(buff), 0);
        if(len == -1)
        {
            break;
        }
        printf("receive: %s\n",buff);
        usleep(1000*1000);

    }
    printf("client exit!\n");
    close(sockfd);
    return 0;
}

同样编译上传给开发板：

4、运行server:

【总结】Purple Pi开发板 在linux socket通信方面非常友好。