47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
#include "udp_client.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];
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const char *str = "Welcome to TencentOS Tiny!";
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const char *server_ip = "182.254.196.11";
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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 confd;
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ssize_t reclen;
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struct timeval tv = {10, 0};
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struct sockaddr_in serveraddr;
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MX_LWIP_Init();
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// 1. 创建一个socket
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confd = socket(AF_INET, SOCK_DGRAM, 0);
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setsockopt(confd, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(struct timeval));
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// 2. 初始化服务器地址
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memset(&serveraddr, 0, sizeof(serveraddr));
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serveraddr.sin_family = AF_INET;
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inet_pton(AF_INET, server_ip, &serveraddr.sin_addr.s_addr);
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serveraddr.sin_port = htons(server_port);
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printf("sendto: %s:%d :%s\n", server_ip, server_port, str);
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// 3. 向服务器发送数据
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sendto(confd, str, strlen(str), 0, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
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reclen = recvfrom(confd, buff, sizeof(buff), 0, NULL, 0);
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if (reclen > 0){
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buff[reclen] = '\0';
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printf("rec(%d):%s\n", reclen, buff);
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} else {
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printf("rec err(%d)", reclen);
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}
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// 5. 关闭socket
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close(confd);
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}
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