51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
#include <rtthread.h>
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#include <lwip/netdb.h> /* 为了解析主机名，需要包含netdb.h头文件 */
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#include <lwip/sockets.h> /* 使用BSD socket，需要包含sockets.h头文件 */
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const char send_data[] = "This is UDP Client from RT-Thread.\n"; /* 发送用到的数据 */
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void udpclient(const char* url, int port, int count)
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{
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int sock;
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struct hostent *host;
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struct sockaddr_in server_addr;
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/* 通过函数入口参数url获得host地址（如果是域名，会做域名解析） */
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host= (struct hostent *) gethostbyname(url);
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/* 创建一个socket，类型是SOCK_DGRAM，UDP类型 */
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if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
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{
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rt_kprintf("Socket error\n");
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return;
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}
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/* 初始化预连接的服务端地址 */
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(port);
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server_addr.sin_addr = *((struct in_addr *)host->h_addr);
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rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
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/* 总计发送count次数据 */
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while (count)
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{
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/* 发送数据到服务远端 */
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sendto(sock, send_data, strlen(send_data), 0,
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(struct sockaddr *)&server_addr, sizeof(struct sockaddr));
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/* 线程休眠一段时间 */
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rt_thread_delay(50);
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/* 计数值减一 */
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count --;
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}
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/* 关闭这个socket */
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lwip_close(sock);
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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/* 输出udpclient函数到finsh shell中 */
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FINSH_FUNCTION_EXPORT(udpclient, startup udp client);
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#endif
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