tcp__client__demo_8c-source.html

Freescale mcu OpenTCP-1.0.4.doc.html.zip 文档

00170 <span class="comment"> */</span>
00171 INT32 tcpc_demo_eventlistener(INT8 cbhandle, UINT8 event, UINT32 par1, UINT32 par2)
00172 {
00173 <span class="comment">/* This function is called by TCP stack to inform about events  */</span>
00174         UINT16 i;
00175         
00176         <span class="keywordflow">if</span>( cbhandle != <a class="code" href="tcp__client__demo_8c.html#a2">tcpc_demo_soch</a>)         <span class="comment">/* Not our handle       */</span>
00177                 <span class="keywordflow">return</span>(-1);
00178         
00179         <span class="keywordflow">switch</span>( event ){
00180                 
00181                 <span class="comment">/* Connection request event. Used by TCP/IP stack to inform</span>
00182 <span class="comment">                 * the application someone is trying to establish a connection.</span>
00183 <span class="comment">                 * Server can decide, based on provided IP address and port number,</span>
00184 <span class="comment">                 * whether to allow or not connection establishment.</span>
00185 <span class="comment">                 * Parameters:</span>
00186 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00187 <span class="comment">                 *  - par2 - remote hosts port number</span>
00188 <span class="comment">                 * </span>
00189 <span class="comment">                 * Return values from event listener:</span>
00190 <span class="comment">                 * -1 - do not allow connection to be established (send reset)</span>
00191 <span class="comment">                 * -2 - do not send any response for now to the SYN packet (let's</span>
00192 <span class="comment">                 *              think a little before answering)</span>
00193 <span class="comment">                 * 1  - allow connection to be established</span>
00194 <span class="comment">                 */</span>
00195                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a54">TCP_EVENT_CONREQ</a>:
00196                         <span class="comment">/* should never get here in client TCP application! */</span>
00197                         DEBUGOUT(<span class="stringliteral">"Connection request arrived!\r\n"</span>);
00198                         
00199                         <span class="comment">/* Enable all connections       */</span>
00200                         <span class="keywordflow">return</span>(-1);
00201                 
00202                         <span class="keywordflow">break</span>;
00203                         
00204                 <span class="comment">/* Connection abort event. Connection on a given socket is beeing </span>
00205 <span class="comment">                 * aborted for somereason (usually retransmissions are used up or </span>
00206 <span class="comment">                 * some abnormal situation in communication happened).</span>
00207 <span class="comment">                 * Parameters:</span>
00208 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00209 <span class="comment">                 *  - par2 - remote hosts port number</span>
00210 <span class="comment">                 */</span>
00211                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a57">TCP_EVENT_ABORT</a>:
00212                         DEBUGOUT(<span class="stringliteral">"Connection aborting!\r\n"</span>);
00213                         <span class="keywordflow">break</span>;
00214                 
00215                 <span class="comment">/* Connection established event - three-way handshaking performed</span>
00216 <span class="comment">                 * OK and connection is established.</span>
00217 <span class="comment">                 * Parameters:</span>
00218 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00219 <span class="comment">                 *  - par2 - remote hosts port number</span>
00220 <span class="comment">                 */</span>
00221                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a55">TCP_EVENT_CONNECTED</a>:
00222                         DEBUGOUT(<span class="stringliteral">"TCP connection established!\r\n"</span>);
00223                         <span class="comment">/* do something ... (initialize data sending for example */</span>
00224                         <span class="keywordflow">break</span>;
00225                         
00226                 <span class="comment">/* Connection closing event. Happens when TCP connection is</span>
00227 <span class="comment">                 * intentionally close by some side calling close function and</span>
00228 <span class="comment">                 * initializing proper TCP connection close procedure.</span>
00229 <span class="comment">                 * Parameters:</span>
00230 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00231 <span class="comment">                 *  - par2 - remote hosts port number</span>
00232 <span class="comment">                 */</span>
00233                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a56">TCP_EVENT_CLOSE</a>:
00234                         DEBUGOUT(<span class="stringliteral">"TCP Connection closing...!\r\n"</span>);
00235                         <span class="keywordflow">break</span>;
00236                         
00237                 <span class="comment">/* Data acknowledgment event. Happens when data that was</span>
00238 <span class="comment">                 * previously sent gets acknowledged. This means we can now</span>
00239 <span class="comment">                 * send some more data! :-)</span>
00240 <span class="comment">                 * Parameters:</span>
00241 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00242 <span class="comment">                 *  - par2 - remote hosts port number</span>
00243 <span class="comment">                 */</span>
00244                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a58">TCP_EVENT_ACK</a>:
00245                         DEBUGOUT(<span class="stringliteral">"Data acknowledged!\r\n"</span>);
00246                         <span class="comment">/* if more data should be sent, adjust variables and</span>
00247 <span class="comment">                                set tcpc_demo_senddata variable */</span>
00248                                 
00249                         <span class="keywordflow">break</span>;
00250                 
00251                 <span class="comment">/* Data received event. Happens when we receive some data over the</span>
00252 <span class="comment">                 * TCP connection.</span>
00253 <span class="comment">                 * Parameters:</span>
00254 <span class="comment">                 *  - par1 - number of data bytes received</span>
00255 <span class="comment">                 *  - par2 = 0</span>
00256 <span class="comment">                 */</span>
00257                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a60">TCP_EVENT_DATA</a>:
00258                         DEBUGOUT(<span class="stringliteral">"Data arrived!\r\n"</span>);
00259                         <span class="comment">/* read data that was received (and </span>
00260 <span class="comment">                         * probably do something with it :-)</span>
00261 <span class="comment">                         */</span>
00262                         <span class="keywordflow">for</span>(i=0;i&lt;par1;i++)
00263                                 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
00264                                 
00265                         <span class="comment">/* If needed initialize data sending</span>
00266 <span class="comment">                         * by setting tcpc_demo_senddata variable</span>
00267 <span class="comment">                         */</span>
00268                         <span class="keywordflow">break</span>;
00269                         
00270                 <span class="comment">/* Regenerate data event. Happens when data needs to be</span>
00271 <span class="comment">                 * retransmitted because of possible loss on the network.</span>
00272 <span class="comment">                 * Note that THE SAME DATA must be sent over and over again</span>
00273 <span class="comment">                 * until TCP_EVENT_ACK is generated (for that data)! </span>
00274 <span class="comment">                 * Parameters:</span>
00275 <span class="comment">                 *  - par1 - amount of data to regenerate (usually all)</span>
00276 <span class="comment">                 *      - par2 = 0</span>
00277 <span class="comment">                 */</span>
00278                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a59">TCP_EVENT_REGENERATE</a>:
00279                         tcpc_demo_send();
00280                         <span class="keywordflow">break</span>;
00281         
00282         
00283                 <span class="keywordflow">default</span>:
00284                         <span class="keywordflow">return</span>(-1);
00285         }
00286 }
00287 
00288 INT16 tcpc_demo_send(<span class="keywordtype">void</span>){
00289         UINT16 i;
00290         <span class="comment">/* first check if data sending is possible (it may be that</span>
00291 <span class="comment">         * previously sent data is not yet acknowledged)</span>
00292 <span class="comment">         */</span>
00293         <span class="keywordflow">if</span>(<a class="code" href="tcp_8c.html#a10">tcp_checksend</a>(<a class="code" href="tcp__client__demo_8c.html#a2">tcpc_demo_soch</a>) &lt; 0 ){
00294                 <span class="comment">/* Not yet */</span>
00295                 <span class="keywordflow">return</span> -1;
00296         }
00297         
00298         <span class="comment">/* put message in buffer. Message needs to start from TCP_APP_OFFSET</span>
00299 <span class="comment">         * because TCP/IP stack will put headers in front of the message to</span>
00300 <span class="comment">         * avoid data copying</span>
00301 <span class="comment">         */</span>
00302         <span class="keywordflow">for</span>(i=0;i&lt;32;i++)
00303                 net_buf[<a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>+i]=<span class="charliteral">'A'</span>+(i%25);
00304 
00305         <span class="comment">/* send data */</span>
00306         <span class="keywordflow">return</span> <a class="code" href="tcp_8c.html#a7">tcp_send</a>(<a class="code" href="tcp__client__demo_8c.html#a2">tcpc_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);
00307 
00308 }
</pre></div><hr><address style="align: right;"><small>Generated on Sun Aug 3 20:32:59 2003 for OpenTCP by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 
width=110 height=53></a>1.2.18 </small></address>
</body>
</html>