73 lines
2.3 KiB
C
73 lines
2.3 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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void tcp_senddata(const char* url, int port, int length)
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{
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struct hostent *host;
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int sock, err, result, timeout, index;
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struct sockaddr_in server_addr;
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rt_uint8_t *buffer_ptr;
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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 = gethostbyname(url);
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/* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
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if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
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{
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/* 创建socket失败 */
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rt_kprintf("Socket error\n");
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return;
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}
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/* 申请内存 */
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buffer_ptr = rt_malloc(length);
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/* 构造发送数据 */
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for (index = 0; index < length; index ++)
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buffer_ptr[index] = index & 0xff;
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timeout = 100;
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/* 设置发送超时时间100ms */
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lwip_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
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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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/* 连接到服务端 */
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err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
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rt_kprintf("TCP thread connect error code: %d\n", err);
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while(1)
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{
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/* 发送数据到sock连接 */
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result = send(sock, buffer_ptr, length, MSG_DONTWAIT);
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if(result < 0) //数据发送错误处理
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{
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rt_kprintf("TCP thread send error: %d\n", result);
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lwip_close(sock);
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/* 关闭连接，重新创建连接 */
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rt_thread_delay(10);
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if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
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rt_kprintf("TCP Socket error:%d\n",sock);
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err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
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rt_kprintf("TCP thread connect error code: %d\n", err);
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}
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else if (result == 0)
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{
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/* 打印send函数返回值为0的警告信息 */
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rt_kprintf("\n Send warning,send function return 0.\r\n");
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}
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}
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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tcpclient函数到finsh shell中 */
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FINSH_FUNCTION_EXPORT(tcp_senddata, send a packet through tcp connection);
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#endif
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