48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
#include "udp_server.h"
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#include "lwip/api.h"
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#include <lwip/sockets.h>
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#include <lwip/err.h>
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#include <lwip/sys.h>
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char buff[512]; // UDP接收数据缓冲区
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const unsigned short server_port = 8000;
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void application_entry(void *arg)
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{
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int sockfd, i;
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ssize_t err, len;
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struct sockaddr_in serveraddr, clientaddr;
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char ipstr[INET_ADDRSTRLEN]; // 16 Bytes
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socklen_t clientlen;
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MX_LWIP_Init();
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/* 构造用于UDP的套接字 */
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sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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memset(&serveraddr, 0, sizeof(serveraddr));
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serveraddr.sin_family = AF_INET;
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serveraddr.sin_addr.s_addr = htonl(INADDR_ANY); //本地任意IP
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serveraddr.sin_port = htons(server_port);
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while (1) {
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bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
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printf("udp bind ip:ANY,port:%d\n", server_port);
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clientlen = sizeof(clientaddr);
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len = recvfrom(sockfd, buff, sizeof(buff), 0, (struct sockaddr *)&clientaddr, &clientlen);
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printf("client IP %s\tPORT %d\nrec:%s\n", inet_ntop(AF_INET, &clientaddr.sin_addr.s_addr, ipstr, sizeof(ipstr)), ntohs(clientaddr.sin_port), buff);
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i = 0;
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while (i < len) {
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buff[i] = toupper(buff[i]);
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i++;
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}
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buff[i] = '\0';
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printf("send: %s\n", buff);
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err = sendto(sockfd, buff, strlen(buff), 0, (struct sockaddr *)&clientaddr, sizeof(clientaddr));
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if (err < 0){
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break;
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}
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}
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close(sockfd);
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}
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