rt-thread-official/examples/network/tcpsendpacket.c

#include <rtthread.h>
#include <lwip/netdb.h>   /* Ϊ<>˽<EFBFBD><CBBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>netdb.hͷ<68>ļ<EFBFBD> */
#include <lwip/sockets.h> /* ʹ<><CAB9>BSD socket<65><74><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>sockets.hͷ<68>ļ<EFBFBD> */

void tcp_senddata(const char* url, int port, int length)
{
    struct hostent *host;
    int sock, err, result, timeout, index;
    struct sockaddr_in server_addr;
    rt_uint8_t *buffer_ptr;

    /* ͨ<><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD>url<72><6C><EFBFBD><EFBFBD>host<73><74>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
    host = gethostbyname(url);
    /* <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>socket<65><74><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>SOCKET_STREAM<41><4D>TCP<43><50><EFBFBD><EFBFBD> */
    if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
    {
        /* <20><><EFBFBD><EFBFBD>socketʧ<74><CAA7> */
        rt_kprintf("Socket error\n");
        return;
    }

    /* <20><><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD> */
    buffer_ptr = rt_malloc(length);
    /* <20><><EFBFBD>췢<EFBFBD><ECB7A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
    for (index = 0; index < length; index ++)
        buffer_ptr[index] = index & 0xff;

    timeout = 100;
    /* <20><><EFBFBD>÷<EFBFBD><C3B7>ͳ<EFBFBD>ʱʱ<CAB1><CAB1>100ms */
    lwip_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
    /* <20><>ʼ<EFBFBD><CABC>Ԥ<EFBFBD><D4A4><EFBFBD>ӵķ<D3B5><C4B7><EFBFBD><EFBFBD>˵<EFBFBD>ַ */
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(port);
    server_addr.sin_addr = *((struct in_addr *)host->h_addr);
    rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));

    /* <20><><EFBFBD>ӵ<EFBFBD><D3B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
    err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
    rt_kprintf("TCP thread connect error code: %d\n", err);

    while(1)
    {
        /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵ<EFBFBD>sock<63><6B><EFBFBD><EFBFBD> */
        result = send(sock, buffer_ptr, length, MSG_DONTWAIT);
        if(result < 0) //<2F><><EFBFBD>ݷ<EFBFBD><DDB7>ʹ<EFBFBD><CDB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        {
            rt_kprintf("TCP thread send error: %d\n", result);
            lwip_close(sock);

            /* <20>ر<EFBFBD><D8B1><EFBFBD><EFBFBD>ӣ<EFBFBD><D3A3><EFBFBD><EFBFBD>´<EFBFBD><C2B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
            rt_thread_delay(10);

            if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
                rt_kprintf("TCP Socket error:%d\n",sock);

            err = connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
            rt_kprintf("TCP thread connect error code: %d\n", err);
        }
        else if (result == 0)
        {
            /* <20><>ӡsend<6E><64><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵΪ0<CEAA>ľ<EFBFBD><C4BE><EFBFBD><EFBFBD><EFBFBD>Ϣ */
            rt_kprintf("\n Send warning,send function return 0.\r\n");
        }
    }
}

#ifdef RT_USING_FINSH
#include <finsh.h>
/* <20><><EFBFBD><EFBFBD>tcpclient<6E><74><EFBFBD><EFBFBD><EFBFBD><EFBFBD>finsh shell<6C><6C> */
FINSH_FUNCTION_EXPORT(tcp_senddata, send a packet through tcp connection);
#endif