📄 tcp_client_demo.lst
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152 if(tcpc_demo_connect){
153 if(tcp_connect(tcpc_demo_soch, TCPC_DEMO_RMT_IP, TCPC_DEMO_RMT_PORT,0)>0){
154 /* Connection establishing procedure started */
155 tcpc_demo_connect=0;
156 }
157 }
158
159 if(tcpc_demo_senddata){
160 if(tcpc_demo_send()!=-1)
161 tcpc_demo_senddata=0;
162 }
163 }
164
165 /*
166 * Event listener invoked when TCP/IP stack receives TCP data for
167 * a given socket. Parameters:
168 * - cbhandle - handle of the socket this packet is intended for. Check it
169 * just to be sure, but in general case not needed
170 * - event - event that is notified. For TCP there are quite a few possible
171 * events, check switch structure below for more information
C51 COMPILER V7.06 TCP_CLIENT_DEMO 11/26/2004 11:32:46 PAGE 4
172 * - par1, par2 - parameters who's use depends on the event that is notified
173 */
174 INT32 tcpc_demo_eventlistener(INT8 cbhandle, UINT8 event, UINT32 par1, UINT32 par2) reentrant
175 {
176 /* This function is called by TCP stack to inform about events */
177 UINT16 i;
178
179 if( cbhandle != tcpc_demo_soch) /* Not our handle */
180 return(-1);
181
182 switch( event ){
183
184 /* Connection request event. Used by TCP/IP stack to inform
185 * the application someone is trying to establish a connection.
186 * Server can decide, based on provided IP address and port number,
187 * whether to allow or not connection establishment.
188 * Parameters:
189 * - par1 - remote hosts IP address
190 * - par2 - remote hosts port number
191 *
192 * Return values from event listener:
193 * -1 - do not allow connection to be established (send reset)
194 * -2 - do not send any response for now to the SYN packet (let's
195 * think a little before answering)
196 * 1 - allow connection to be established
197 */
198 case TCP_EVENT_CONREQ:
199 /* should never get here in client TCP application! */
200 DEBUGOUT("Connection request arrived!\r\n");
201
202 /* Enable all connections */
203 return(-1);
204
205 break;
206
207 /* Connection abort event. Connection on a given socket is beeing
208 * aborted for somereason (usually retransmissions are used up or
209 * some abnormal situation in communication happened).
210 * Parameters:
211 * - par1 - remote hosts IP address
212 * - par2 - remote hosts port number
213 */
214 case TCP_EVENT_ABORT:
215 DEBUGOUT("Connection aborting!\r\n");
216 break;
217
218 /* Connection established event - three-way handshaking performed
219 * OK and connection is established.
220 * Parameters:
221 * - par1 - remote hosts IP address
222 * - par2 - remote hosts port number
223 */
224 case TCP_EVENT_CONNECTED:
225 DEBUGOUT("TCP connection established!\r\n");
226 /* do something ... (initialize data sending for example */
227 break;
228
229 /* Connection closing event. Happens when TCP connection is
230 * intentionally close by some side calling close function and
231 * initializing proper TCP connection close procedure.
232 * Parameters:
233 * - par1 - remote hosts IP address
C51 COMPILER V7.06 TCP_CLIENT_DEMO 11/26/2004 11:32:46 PAGE 5
234 * - par2 - remote hosts port number
235 */
236 case TCP_EVENT_CLOSE:
237 DEBUGOUT("TCP Connection closing...!\r\n");
238 break;
239
240 /* Data acknowledgment event. Happens when data that was
241 * previously sent gets acknowledged. This means we can now
242 * send some more data! :-)
243 * Parameters:
244 * - par1 - remote hosts IP address
245 * - par2 - remote hosts port number
246 */
247 case TCP_EVENT_ACK:
248 DEBUGOUT("Data acknowledged!\r\n");
249 /* if more data should be sent, adjust variables and
250 set tcpc_demo_senddata variable */
251
252 break;
253
254 /* Data received event. Happens when we receive some data over the
255 * TCP connection.
256 * Parameters:
257 * - par1 - number of data bytes received
258 * - par2 = 0
259 */
260 case TCP_EVENT_DATA:
261 DEBUGOUT("Data arrived!\r\n");
262 /* read data that was received (and
263 * probably do something with it :-)
264 */
265 for(i=0;i<par1;i++)
266 RECEIVE_NETWORK_B();
267
268 /* If needed initialize data sending
269 * by setting tcpc_demo_senddata variable
270 */
271 break;
272
273 /* Regenerate data event. Happens when data needs to be
274 * retransmitted because of possible loss on the network.
275 * Note that THE SAME DATA must be sent over and over again
276 * until TCP_EVENT_ACK is generated (for that data)!
277 * Parameters:
278 * - par1 - amount of data to regenerate (usually all)
279 * - par2 = 0
280 */
281 case TCP_EVENT_REGENERATE:
282 tcpc_demo_send();
283 break;
284
285
286 default:
287 return(-1);
288 }
289 }
290
291 INT16 tcpc_demo_send(void){
292 UINT16 i;
293 /* first check if data sending is possible (it may be that
294 * previously sent data is not yet acknowledged)
295 */
C51 COMPILER V7.06 TCP_CLIENT_DEMO 11/26/2004 11:32:46 PAGE 6
296 if(tcp_checksend(tcpc_demo_soch) < 0 ){
297 /* Not yet */
298 return -1;
299 }
300
301 /* put message in buffer. Message needs to start from TCP_APP_OFFSET
302 * because TCP/IP stack will put headers in front of the message to
303 * avoid data copying
304 */
305 /* for(i=0;i<32;i++)
306 net_buf[TCP_APP_OFFSET+i]='A'+(i%25); */
307 for(i=0;i<BufferLen;i++)
308 net_buf[TCP_APP_OFFSET+i]=Buffer[i];
309
310 /* send data */
311 return tcp_send(tcpc_demo_soch, &net_buf[TCP_APP_OFFSET], NETWORK_TX_BUFFER_SIZE - TCP_APP_OFFSET, Buffer
-Len);
312
313 }
C51 COMPILATION COMPLETE. 5 WARNING(S), 1 ERROR(S)
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