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    這里向用戶介紹一個讓ZLIP同時處理4個TCP連接（2個客戶端、2個服務(wù)器端）、兩個UDP連接和PING的程序。該演示將讓用戶初步了解ZLIP的功能。

   按照開發(fā)運行新程序一節(jié)的步驟將UseZLIPLib下載到開發(fā)板中。

1． 打開sscomv2.0，波特率為19200；重新打開開發(fā)板電源，串口顯示：

test_complex_send_recv test...
TODO: listen at 192.168.0.3:1024, and press key
press any key...

按以上要求讓SocketTestDlg在TCP1024端口監(jiān)聽，然后向串口發(fā)送一個任意字符，作為“press key”。

串口和SocketTestDlg提示信息表明開發(fā)板向PC機(jī)發(fā)起了兩個連接并建立了兩個連接。
2． 發(fā)送文件：由于發(fā)送文件需要較長時間，需要再運行一個SocketTestDlg程序，并使用Client Connect向192.168.0.2:1024發(fā)起連接。

串口輸出和SocketTestDlg提示信息表明連接建立。SocketTestDlg中的send file選擇為“\工具\SocketTestDlg\send_test_file\1_75M”，Send Mode選擇Send File。點擊ClientSend 開始發(fā)送文件。
3． 采用ping 192.168.0.2 –t，PING開發(fā)板。

4． 做如下的操作（為了演示ZLIP的同時處理多個連接的能力，以下操作在上面的數(shù)據(jù)發(fā)送和PING同時進(jìn)行）：
(1) 采用ServerSend向板子發(fā)送“a”字符，串口顯示“sc0 a”和“sc1 a”表明板子上的兩個TCP客戶端都收到數(shù)據(jù)“a”。

(2) 采用ClienConnect向板子的192.168.0.2:1024發(fā)起連接，可建立連接。串口顯示“l(fā)isen 1 accept”，表明連接建立。連接建立以后采用ClientSend發(fā)送“b”，服務(wù)器端將收到回饋數(shù)據(jù)“b”。
(3) SocketTestDlg創(chuàng)建UDP后，向UDP 192.168.0.2:1024和UDP 192.168.0.2:1025分別發(fā)送“c和發(fā)送“d”字符，串口顯示“su0 recv2:c”和“su1 recv2:d”表明板子上的兩個UDP實例也收到了數(shù)據(jù)。
5． 當(dāng)?shù)诙�步“發(fā)送文件”完成后，點擊ClientClose關(guān)閉連接，此時串口和SocketTestDlg提示消息如下：

圖中顯示了接收方（串口顯示的數(shù)據(jù)）和發(fā)送方（SocketTestDlg顯示的數(shù)據(jù)）的數(shù)據(jù)校驗和一致，表明發(fā)送數(shù)據(jù)無誤。
在該演示例子中，演示了ZLIP同時處理4個TCP連接（2個作為客戶端、2個作為服務(wù)器端）、兩個UDP連接和PING功能的能力。
以上例子的代碼如下（該代碼讀者可稍作了解，詳細(xì)的分析需參考Socket API）：

void test_complex_send_recv()
{
    /* 2 listen, 2 connect, 4 accpeted 2 udp, and ping same time
    server:
    listen and send any data
    connect and send big data
    connect to 1025, 1024 at any time.
    send any data to udp port
    ping all the time.*/

    SOCKET sl[2], sc[2], sa[4], su[2];
    struct sockaddr_in src_addr, dest_addr, get_addr;
    fd_set r, w;
    zl_u32 len, val;
    int accept_cnt, i, j;
    int sc0_conn=FALSE, sc1_conn=FALSE;
    int ret;
    zl_u32 total_recv=0;
    zl_u32 file_sum = 0;
    zl_u8 c=0;

    printf("\ntest_complex_send_recv test...");
    if((sl[0] = socket(PF_INET, SOCK_STREAM, 0)) == SOCK_ERR)
        return;
    if((sl[1] = socket(PF_INET, SOCK_STREAM, 0)) == SOCK_ERR)
        return;
    if((sc[0] = socket(PF_INET, SOCK_STREAM, 0)) == SOCK_ERR)
        return;
    if((sc[1] = socket(PF_INET, SOCK_STREAM, 0)) == SOCK_ERR)
        return;
    if((su[0] = socket(PF_INET, SOCK_DGRAM, 0)) == SOCK_ERR)
        return;
    if((su[1] = socket(PF_INET, SOCK_DGRAM, 0)) == SOCK_ERR)
        return;
    /* listen */
    src_addr.sin_addr = IPAddr;
    src_addr.sin_port = 1024;
    dest_addr.sin_addr = DestIP;
    dest_addr.sin_port = 1024;
    len = sizeof(struct sockaddr_in);
    printf("\nTODO: listen at %s:%d, and press key",inet_ntoa(&dest_addr),dest_addr.sin_port);
    wait_key();
    printf("\nTODO: do any of the following action, even at same time( if any socket closed by peer exit):"
        "\n1. Peer listen socket send any data to us."
        "\n2. peer connect to %s:%d or 1025 at any time (max two socket, NOTE by two TestSocket app)and send big data."
        "\n3. send any UDP data to udp %s:%d or 1025."
        "\n4. ping at any time.",inet_ntoa(&src_addr),src_addr.sin_port,inet_ntoa(&src_addr),src_addr.sin_port);
    printf("\nEXPECT: print \"sc0 and sc1 connection establish\", and correspond to each action:"
        "\n1. print \"s0 or s1 receive\" and peer receive the data sent"
        "\n2. print \"listen accept\". print \"sa receive\". print the result and len of file sent by connection 0, peer will         receive some data from sa[0] for every receive;sa[1] will send what received."
        "\n3. print \"su0 or su1 recevie data\" and peer receive the same data"
        "\n4. ping success.");
    /* listen and udp */
    if(bind(sl[0], &src_addr, len) == SOCK_ERR)
        return;
    if(bind(su[0], &src_addr, len) == SOCK_ERR)
        return;
    src_addr.sin_port = 1025;
    if(bind(sl[1], &src_addr, len) == SOCK_ERR)
        return;
    if(bind(su[1], &src_addr, len) == SOCK_ERR)
        return;
    listen(sl[0], 0);
    listen(sl[1], 0);

    /* connect in nonblock */
    val = TRUE;
    ioctlsocket(sc[0], FIONBIO, &val);
    val = TRUE;
    ioctlsocket(sc[1], FIONBIO, &val);
    connect(sc[0], &dest_addr, len);
    connect(sc[1], &dest_addr, len);
    accept_cnt = 0;
    while(TRUE)
    {
        FD_ZERO(&r);
        FD_ZERO(&w);
        FD_SET(sl[0], &r);
        FD_SET(sl[1], &r);
        FD_SET(su[0], &r);
        FD_SET(su[1], &r);
        if(sc0_conn == FALSE)
            FD_SET(sc[0], &w);

        /* it can be read, if connection fail */
        FD_SET(sc[0], &r);

        if(sc1_conn == FALSE)
            FD_SET(sc[1], &w);
        FD_SET(sc[1], &r);

        for(i = 0; i< accept_cnt; i++)
            FD_SET(sa[i], &r);

        select(0, &r, &w, NULL, NULL);
        /* check accept sl[0]*/
        if(FD_ISSET(sl[0], &r))
        {
            printf("\nlisten 0 accept");
            len = sizeof(struct sockaddr_in);
            if((sa[accept_cnt++] = accept(sl[0], &dest_addr, &len)) == SOCK_ERR)
            {
                printf("accept error!");
                accept_cnt--;
            }
        }
        /* check accept sl[1]*/
        if(FD_ISSET(sl[1], &r))
        {
            printf("\nlisten 1 accept");
            len = sizeof(struct sockaddr_in);
            if((sa[accept_cnt++] = accept(sl[1], &dest_addr, &len)) == SOCK_ERR)
            {
                printf("accept error!");
                accept_cnt--;
            }
        }
        /* check nonblock connection stablish */
        if(FD_ISSET(sc[0], &w))
        {
            printf("\nsc 0 connection establish");
            sc0_conn = TRUE;
        }
        if(FD_ISSET(sc[1], &w))
        {
            printf("\nsc 1 connection establish");
            sc1_conn = TRUE;
        }
        /* check peer listen socket send data */
        if(FD_ISSET(sc[0], &r))
        {
            ret = recv(sc[0], DataBlockBIG, DATA_SIZE_BIG, MSG_RECV_NORMAL);
            send(sc[0], DataBlockBIG, ret, 0);
            if(ret == 0)
            {
                printf("\nsocket colsed by peer!");
                break;
            }
            else
            {
                printf("sc0 %s ",DataBlockBIG);
            }
        }
        if(FD_ISSET(sc[1], &r))
        {
            ret = recv(sc[1], DataBlockBIG, DATA_SIZE_BIG, MSG_RECV_NORMAL);
            send(sc[1], DataBlockBIG, ret, 0);
            if(ret == 0)
            {
                printf("\nsocket colsed by peer!");
                break;
            }
            else
            {
                printf("sc1 %s ",DataBlockBIG);
            }
        }
        /* check upd socket recv data */
        if(FD_ISSET(su[0], &r))
        {
            len = sizeof(struct sockaddr_in);
            ret = recvfrom(su[0], DataBlockBIG, DATA_SIZE_BIG, MSG_RECV_NORMAL,
                &get_addr, &len);
            printf("su0 recv%d: %s ",ret, DataBlockBIG);
            sendto(su[0], DataBlockBIG, ret, 0, &get_addr, len);
        }
        if(FD_ISSET(su[1], &r))
        {
             len = sizeof(struct sockaddr_in);
            ret = recvfrom(su[1], DataBlockBIG, DATA_SIZE_BIG, MSG_RECV_NORMAL,
            &get_addr, &len);
            printf("su1 recv%d: %s ",ret, DataBlockBIG);
            sendto(su[1], DataBlockBIG, ret, 0, &get_addr, len);
        }

        for(i = 0; i< accept_cnt; i++)
        {
            if(FD_ISSET(sa[i], &r))
            {
                //printf("sa%d recv ",i);
                ret = recv(sa[i], DataBlockBIG, DATA_SIZE_BIG, MSG_RECV_NORMAL);
                if(ret == 0)
                {
                    printf("\nsocket colsed by peer!");
                    break;
                }
                /* only sum what sa 0 received */
                else if(i == 0)
                {
                    for(j = 0; j<ret; j++)
                    {
                       file_sum += ((zl_u32)DataBlockBIG[j]-(zl_u32)(c>>(DataBlockBIG[j]&7)));
                       c = DataBlockBIG[j];
                    }
                    total_recv += (zl_u32)ret;
                    //printf(".%ld.",total_recv);
                }
                else
                {
                    send(sa[i],DataBlockBIG,ret,0);
                }
            }
        }
        if(i!=accept_cnt)
            break;
    }
    socketclose(sl[0]);
    socketclose(sl[1]);
    socketclose(sc[0]);
    socketclose(sc[1]);
    socketclose(su[0]);
    socketclose(su[1]);
    for(i = 0; i<accept_cnt; i++)
    {
        socketclose(sa[i]);
    }
    printf("\nresult= %lu,file len= %ld , please check it!", file_sum,total_recv);
}

int main(void)
{
    /* this devRTL will be used in tcp/ip, pointed by NetIf->Info */

    struct zlip_addr_info DT_XDATA addr_info=
    {
        ETHER_ADDR,
        IPAddr,
        NetMask,
        GateWay
    };

    /*
    * init
    */
    ZLIP_Init(&addr_info);

    test_complex_send_recv();

    ZLIP_Release();

    /*
    * release
    */
    while(TRUE);
    return TRUE;
}