W5500 SERVER

发布于 2021-07-21 08:06:30 浏览：851 订阅该版

实现目标：W5500作为SERVER端，最大5台客户端同时连接。
出现问题：客户端连接后，发一次数据，再发数据，SERVER就在收不到数据。不知什么原因。
```c
static void thread4_entry(void *parameter)
{
		/* tcp server */
		#define SERVER_PORT 6666
		#define BUFFER_SIZE 512
		#define SOMAXCONN 5

char recv_buf[BUFFER_SIZE];
		
		int sockfd = -1;
    int acceptfd = -1;
    struct sockaddr_in server;    
    struct sockaddr_in peerServer;
    int recv_bytes;

sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        printf("sock create failed\n");       
    }
    
    memset(&server, 0, sizeof(struct sockaddr_in));
    server.sin_family = AF_INET;
    server.sin_port = htons(SERVER_PORT);
    server.sin_addr.s_addr = htonl(INADDR_ANY);

if(bind(sockfd, (struct sockaddr*)&server, sizeof(server)) < 0) {
        printf("sock bind failed\n");
        closesocket(sockfd);        
    }

if(listen(sockfd, SOMAXCONN) < 0) {
        closesocket(sockfd);
        printf("sock listen failed\n");
    }
    
    socklen_t len = sizeof(peerServer); 
		
		
		while (1)
    {
				acceptfd = accept(sockfd, (struct sockaddr*)&peerServer, &len);
				if (acceptfd < 0) {
						printf("sock accept failed\n");
						closesocket(sockfd);
				}
				memset(recv_buf, 0, sizeof(recv_buf));
				recv_bytes = recv(acceptfd, recv_buf, sizeof(recv_buf), 0);
				printf("recv data:%s len:%d\n", recv_buf, recv_bytes);
				
				if(recv_bytes <= 0)
				{
//						if((EINTR == errno) || (EAGAIN == errno) || (EWOULDBLOCK == errno))
//						{
//								continue;
//						}
						//printf("Recv data failed\n");
						closesocket(sockfd);
					  closesocket(acceptfd);
						printf("Disconnect \n");
												
				}				
				else
				{
						//printf("recv data:%s len:%d\n", recv_buf, recv_bytes);
						send(acceptfd,recv_buf, recv_bytes, 0);	
				}
								
    }
		
		//closesocket(sockfd);
    //closesocket(acceptfd);
}
```