tcp__server__demo_8c-example.html

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<span class="comment"> *      events, check switch structure below for more information</span>
<span class="comment"> * - par1, par2 - parameters who's use depends on the event that is notified</span>
<span class="comment"> */</span>
INT32 tcps_demo_eventlistener(INT8 cbhandle, UINT8 event, UINT32 par1, UINT32 par2)
{
<span class="comment">/* This function is called by TCP stack to inform about events  */</span>
        UINT16 i;
        
        <span class="keywordflow">if</span>( cbhandle != <a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>)         <span class="comment">/* Not our handle       */</span>
                <span class="keywordflow">return</span>(-1);
        
        <span class="keywordflow">switch</span>( event ){
                
                <span class="comment">/* Connection request event. Used by TCP/IP stack to inform</span>
<span class="comment">                 * the application someone is trying to establish a connection.</span>
<span class="comment">                 * Server can decide, based on provided IP address and port number,</span>
<span class="comment">                 * whether to allow or not connection establishment.</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - remote hosts IP address</span>
<span class="comment">                 *  - par2 - remote hosts port number</span>
<span class="comment">                 * </span>
<span class="comment">                 * Return values from event listener:</span>
<span class="comment">                 * -1 - do not allow connection to be established (send reset)</span>
<span class="comment">                 * -2 - do not send any response for now to the SYN packet (let's</span>
<span class="comment">                 *              think a little before answering)</span>
<span class="comment">                 * 1  - allow connection to be established</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a54">TCP_EVENT_CONREQ</a>:
                        DEBUGOUT(<span class="stringliteral">"Connection request arrived!\r\n"</span>);
                        
                        <span class="comment">/* Enable all connections       */</span>
                        <span class="keywordflow">return</span>(1);
                
                        <span class="keywordflow">break</span>;
                        
                <span class="comment">/* Connection abort event. Connection on a given socket is beeing </span>
<span class="comment">                 * aborted for somereason (usually retransmissions are used up or </span>
<span class="comment">                 * some abnormal situation in communication happened).</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - remote hosts IP address</span>
<span class="comment">                 *  - par2 - remote hosts port number</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a57">TCP_EVENT_ABORT</a>:
                        DEBUGOUT(<span class="stringliteral">"Connection aborting!\r\n"</span>);
                        <span class="keywordflow">break</span>;
                
                <span class="comment">/* Connection established event - three-way handshaking performed</span>
<span class="comment">                 * OK and connection is established.</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - remote hosts IP address</span>
<span class="comment">                 *  - par2 - remote hosts port number</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a55">TCP_EVENT_CONNECTED</a>:
                        DEBUGOUT(<span class="stringliteral">"TCP connection established!\r\n"</span>);
                
                        <span class="keywordflow">break</span>;
                        
                <span class="comment">/* Connection closing event. Happens when TCP connection is</span>
<span class="comment">                 * intentionally close by some side calling close function and</span>
<span class="comment">                 * initializing proper TCP connection close procedure.</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - remote hosts IP address</span>
<span class="comment">                 *  - par2 - remote hosts port number</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a56">TCP_EVENT_CLOSE</a>:
                        DEBUGOUT(<span class="stringliteral">"TCP Connection closing...!\r\n"</span>);
                        <span class="keywordflow">break</span>;
                        
                <span class="comment">/* Data acknowledgment event. Happens when data that was</span>
<span class="comment">                 * previously sent gets acknowledged. This means we can now</span>
<span class="comment">                 * send some more data! :-)</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - remote hosts IP address</span>
<span class="comment">                 *  - par2 - remote hosts port number</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a58">TCP_EVENT_ACK</a>:
                        DEBUGOUT(<span class="stringliteral">"Data acknowledged!\r\n"</span>);
                        <span class="comment">/* if more data should be sent, adjust variables and</span>
<span class="comment">                                set tcps_demo_senddata variable */</span>
                                
                        <span class="keywordflow">break</span>;
                
                <span class="comment">/* Data received event. Happens when we receive some data over the</span>
<span class="comment">                 * TCP connection.</span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - number of data bytes received</span>
<span class="comment">                 *  - par2 = 0</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a60">TCP_EVENT_DATA</a>:
                        DEBUGOUT(<span class="stringliteral">"Data arrived!\r\n"</span>);
                        <span class="comment">/* read data that was received (and </span>
<span class="comment">                         * probably do something with it :-)</span>
<span class="comment">                         */</span>
                        <span class="keywordflow">for</span>(i=0;i&lt;par1;i++)
                                <a name="a3"></a><a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
                                
                        <span class="comment">/* If needed initialize data sending</span>
<span class="comment">                         * by setting tcps_demo_senddata variable</span>
<span class="comment">                         */</span>
                        <span class="keywordflow">break</span>;
                        
                <span class="comment">/* Regenerate data event. Happens when data needs to be</span>
<span class="comment">                 * retransmitted because of possible loss on the network.</span>
<span class="comment">                 * Note that THE SAME DATA must be sent over and over again</span>
<span class="comment">                 * until TCP_EVENT_ACK is generated (for that data)! </span>
<span class="comment">                 * Parameters:</span>
<span class="comment">                 *  - par1 - amount of data to regenerate (usually all)</span>
<span class="comment">                 *      - par2 = 0</span>
<span class="comment">                 */</span>
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a59">TCP_EVENT_REGENERATE</a>:
                        tcps_demo_send();
                        <span class="keywordflow">break</span>;
        
        
                <span class="keywordflow">default</span>:
                        <span class="keywordflow">return</span>(-1);
        }
}

INT16 tcps_demo_send(<span class="keywordtype">void</span>){
        UINT16 i;
        <span class="comment">/* first check if data sending is possible (it may be that</span>
<span class="comment">         * previously sent data is not yet acknowledged)</span>
<span class="comment">         */</span>
        <span class="keywordflow">if</span>(<a name="a4"></a><a class="code" href="group__tcp__app__api.html#a7">tcp_checksend</a>(<a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>) &lt; 0 ){
                <span class="comment">/* Not yet */</span>
                <span class="keywordflow">return</span> -1;
        }
        
        <span class="comment">/* put message in buffer. Message needs to start from TCP_APP_OFFSET</span>
<span class="comment">         * because TCP/IP stack will put headers in front of the message to</span>
<span class="comment">         * avoid data copying</span>
<span class="comment">         */</span>
        <span class="keywordflow">for</span>(i=0;i&lt;32;i++)
                net_buf[<a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>+i]=<span class="charliteral">'A'</span>+(i%25);

        <span class="comment">/* send data */</span>
        <span class="keywordflow">return</span> <a name="a5"></a><a class="code" href="group__tcp__app__api.html#a4">tcp_send</a>(<a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>, &amp;net_buf[<a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>], <a class="code" href="group__opentcp__config.html#a4">NETWORK_TX_BUFFER_SIZE</a> - <a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>, 32);

}
</pre></div><hr><address style="align: right;"><small>Generated on Sun Aug 3 20:32:59 2003 for OpenTCP by
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