git.sur5r.net Git - freertos/blob - FreeRTOS-Labs/Demo/FreeRTOS_Plus_TCP_and_FAT_Windows_Simulator/DemoTasks/SimpleTCPEchoServer.c

   1 /*\r
   2     FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.\r
   3     All rights reserved\r
   4 \r
   5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     This file is part of the FreeRTOS distribution.\r
   8 \r
   9     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  10     the terms of the GNU General Public License (version 2) as published by the\r
  11     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  12 \r
  13     ***************************************************************************\r
  14     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  15     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  16     >>!   obliged to provide the source code for proprietary components     !<<\r
  17     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  18     ***************************************************************************\r
  19 \r
  20     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  21     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  22     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
  23     link: http://www.freertos.org/a00114.html\r
  24 \r
  25     ***************************************************************************\r
  26      *                                                                       *\r
  27      *    FreeRTOS provides completely free yet professionally developed,    *\r
  28      *    robust, strictly quality controlled, supported, and cross          *\r
  29      *    platform software that is more than just the market leader, it     *\r
  30      *    is the industry's de facto standard.                               *\r
  31      *                                                                       *\r
  32      *    Help yourself get started quickly while simultaneously helping     *\r
  33      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
  34      *    tutorial book, reference manual, or both:                          *\r
  35      *    http://www.FreeRTOS.org/Documentation                              *\r
  36      *                                                                       *\r
  37     ***************************************************************************\r
  38 \r
  39     http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading\r
  40     the FAQ page "My application does not run, what could be wrong?".  Have you\r
  41     defined configASSERT()?\r
  42 \r
  43     http://www.FreeRTOS.org/support - In return for receiving this top quality\r
  44     embedded software for free we request you assist our global community by\r
  45     participating in the support forum.\r
  46 \r
  47     http://www.FreeRTOS.org/training - Investing in training allows your team to\r
  48     be as productive as possible as early as possible.  Now you can receive\r
  49     FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers\r
  50     Ltd, and the world's leading authority on the world's leading RTOS.\r
  51 \r
  52     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  53     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  54     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  55 \r
  56     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
  57     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
  58 \r
  59     http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High\r
  60     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  61     licenses offer ticketed support, indemnification and commercial middleware.\r
  62 \r
  63     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  64     engineered and independently SIL3 certified version for use in safety and\r
  65     mission critical applications that require provable dependability.\r
  66 \r
  67     1 tab == 4 spaces!\r
  68 */\r
  69 \r
  70 /*\r
  71  * FreeRTOS tasks are used with FreeRTOS+TCP to create a TCP echo server.  Echo\r
  72  * clients are also created, but the echo clients use Windows threads (as\r
  73  * opposed to FreeRTOS tasks) and use the Windows TCP library (Winsocks).  This\r
  74  * creates a communication between the FreeRTOS+TCP TCP/IP stack and the Windows\r
  75  * TCP/IP stack.\r
  76  *\r
  77  * See the following web page for essential demo usage and configuration\r
  78  * details:\r
  79  * http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/examples_FreeRTOS_simulator.html\r
  80  */\r
  81 \r
  82 /* Standard includes. */\r
  83 #include <stdint.h>\r
  84 #include <stdio.h>\r
  85 #include <WinSock2.h>\r
  86 #include <Mswsock.h>\r
  87 \r
  88 /* FreeRTOS includes. */\r
  89 #include "FreeRTOS.h"\r
  90 #include "task.h"\r
  91 #include "semphr.h"\r
  92 \r
  93 /* FreeRTOS+TCP includes. */\r
  94 #include "FreeRTOS_IP.h"\r
  95 #include "FreeRTOS_Sockets.h"\r
  96 \r
  97 /* Remove the whole file if FreeRTOSIPConfig.h is set to exclude TCP. */\r
  98 #if( ipconfigUSE_TCP == 1 )\r
  99 \r
 100 /* This example uses Winsocks clients to talk to a FreeRTOS+TCP server. */\r
 101 #pragma comment( lib, "ws2_32.lib" )\r
 102 \r
 103 /* The number of Winsock clients that communicate with the FreeRTOS+TCP\r
 104 server. */\r
 105 #define tcpechoNUMBER_OF_CLIENTS                1\r
 106 \r
 107 /* Specifies the size of the data sent to the server in MSS units. */\r
 108 #define tcpechoBUFFER_SIZE_MULTIPLIER   3\r
 109 \r
 110 /* Delay between cycles so as not to flood the network. */\r
 111 #define tcpechoLOOP_DELAY       ( ( TickType_t ) 750 / portTICK_PERIOD_MS )\r
 112 \r
 113 /* The maximum time to wait for a closing socket to close. */\r
 114 #define tcpechoSHUTDOWN_DELAY   ( pdMS_TO_TICKS( 5000 ) )\r
 115 \r
 116 /* The time to wait between reads of a Winsock socket when shutting the socket\r
 117 down. */\r
 118 #define tcpechoWINSOCK_SHUTDOWN_DELAY   ( 5 )\r
 119 \r
 120 /* The standard echo port number. */\r
 121 #define tcpechoPORT_NUMBER              7\r
 122 \r
 123 /* The size of the Rx and Tx buffers. */\r
 124 #define tcpechoBUFFER_SIZE ( ipconfigTCP_MSS * tcpechoBUFFER_SIZE_MULTIPLIER )\r
 125 \r
 126 /*-----------------------------------------------------------*/\r
 127 \r
 128 /*\r
 129  * Uses Winsocks from Windows threads to send data from the real IP and MAC\r
 130  * addresses to the IP and MAC addresses spoofed by FreeRTOS+TCP.  Multiple\r
 131  * instances of this task are created.\r
 132  */\r
 133 DWORD WINAPI prvSimpleWinsockTCPClientTask( void *pvParameters );\r
 134 \r
 135 /*\r
 136  * Uses FreeRTOS+TCP to listen for incoming echo connections, creating a task\r
 137  * to handle each connection.\r
 138  */\r
 139 static void prvConnectionListeningTask( void *pvParameters );\r
 140 \r
 141 /*\r
 142  * Created by the connection listening task to handle a single connection.\r
 143  */\r
 144 static void prvServerConnectionInstance( void *pvParameters );\r
 145 \r
 146 /*\r
 147  * Create a string to transmit of pseudo random length.\r
 148  */\r
 149 static BaseType_t prvCreateTxData( char *cBuffer, uint32_t ulBufferLength );\r
 150 \r
 151 /*\r
 152  * Create the Windows threads that use the Windows TCP/IP stack to talk to the\r
 153  * FreeRTOS task that is using the FreeRTOS+TCP TCP/IP stack.\r
 154  */\r
 155 static void prvCreateWindowsThreadClients( void );\r
 156 \r
 157 /*-----------------------------------------------------------*/\r
 158 \r
 159 /* Stores the stack size passed into vStartSimpleTCPServerTasks() so it can be\r
 160 reused when the server listening task creates tasks to handle connections. */\r
 161 static uint16_t usUsedStackSize = 0;\r
 162 \r
 163 /* Used for error reporting. */\r
 164 static uint32_t ulConnectionCount = 0, ulClientCycles = 0, ulClientTransmitErrors = 0, ulIncorrectDataReceived;\r
 165 static uint32_t ulClientSocketsClosedDuringReceive = 0, ulClientReceiveErrors = 0;\r
 166 \r
 167 /* The buffers used to hold the string to Tx and the received string. */\r
 168 static char cTxBuffers[ tcpechoNUMBER_OF_CLIENTS ][ tcpechoBUFFER_SIZE ], cRxBuffers[ tcpechoNUMBER_OF_CLIENTS ][ tcpechoBUFFER_SIZE ];\r
 169 \r
 170 /*-----------------------------------------------------------*/\r
 171 \r
 172 void vStartSimpleTCPServerTasks( uint16_t usStackSize, UBaseType_t uxPriority )\r
 173 {\r
 174 WORD wVersionRequested;\r
 175 WSADATA xWSAData;\r
 176 \r
 177         /* The clients use Winsock sockets and must therefore run at the idle\r
 178         priority. */\r
 179         configASSERT( uxPriority == tskIDLE_PRIORITY );\r
 180 \r
 181         /* Create the TCP echo server.  The echo server uses FreeRTOS+TCP through\r
 182         the spoofed IP and MAC address.  The WinSock client tasks are created from\r
 183         inside the listening task. */\r
 184         xTaskCreate( prvConnectionListeningTask, "ServerListener", usStackSize, NULL, uxPriority + 1, NULL );\r
 185 \r
 186         /* Prepare to use WinSock library. */\r
 187         wVersionRequested = MAKEWORD( 2, 2 );\r
 188         configASSERT( WSAStartup( wVersionRequested, &xWSAData ) == ( WORD ) 0 );\r
 189 \r
 190         /* Remember the requested stack size so it can be re-used by the server\r
 191         listening task when it creates tasks to handle connections. */\r
 192         usUsedStackSize = usStackSize;\r
 193 }\r
 194 /*-----------------------------------------------------------*/\r
 195 \r
 196 static void prvCreateWindowsThreadClients( void )\r
 197 {\r
 198 BaseType_t xClientTask;\r
 199 HANDLE xWinHandle;\r
 200 \r
 201         /* Create a set of (Windows thread) clients, all of which talk to the same\r
 202         (FreeRTOS task) server.  The clients use Winsocks through the real IP and\r
 203         MAC address. */\r
 204         for( xClientTask = 0; xClientTask < tcpechoNUMBER_OF_CLIENTS; xClientTask++ )\r
 205         {\r
 206                 xWinHandle = CreateThread(\r
 207                         NULL,                                                   /* Pointer to thread security attributes. */\r
 208                         0,                                                              /* Initial thread stack size, in bytes. */\r
 209                         prvSimpleWinsockTCPClientTask,  /* Pointer to thread function. */\r
 210                         ( void * ) xClientTask,                 /* Argument for new thread. */\r
 211                         0,                                                              /* Creation flags. */\r
 212                         NULL );\r
 213 \r
 214                 /* Set the priority and the cores used of the Windows threads such that\r
 215                 they do no interfere with the FreeRTOS simulator. */\r
 216                 SetThreadPriority( xWinHandle, THREAD_PRIORITY_IDLE );\r
 217                 SetThreadPriorityBoost( xWinHandle, TRUE );\r
 218                 SetThreadAffinityMask( xWinHandle, ~0x01u );\r
 219         }\r
 220 }\r
 221 /*-----------------------------------------------------------*/\r
 222 \r
 223 static void prvConnectionListeningTask( void *pvParameters )\r
 224 {\r
 225 struct freertos_sockaddr xClient, xBindAddress;\r
 226 Socket_t xListeningSocket, xConnectedSocket;\r
 227 socklen_t xSize = sizeof( xClient );\r
 228 static const TickType_t xReceiveTimeOut = portMAX_DELAY;\r
 229 const BaseType_t xBacklog = 20;\r
 230 WinProperties_t xWinProps;\r
 231 \r
 232         /* Just to prevent compiler warnings. */\r
 233         ( void ) pvParameters;\r
 234 \r
 235         /* Attempt to open the socket. */\r
 236         xListeningSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_STREAM, FREERTOS_IPPROTO_TCP );\r
 237         configASSERT( xListeningSocket != FREERTOS_INVALID_SOCKET );\r
 238 \r
 239         /* Set a time out so accept() will just wait for a connection. */\r
 240         FreeRTOS_setsockopt( xListeningSocket, 0, FREERTOS_SO_RCVTIMEO, &xReceiveTimeOut, sizeof( xReceiveTimeOut ) );\r
 241 \r
 242         /* Fill in the buffer and window sizes that will be used by the socket. */\r
 243         xWinProps.lTxBufSize = 6 * ipconfigTCP_MSS;\r
 244         xWinProps.lTxWinSize = 3;\r
 245         xWinProps.lRxBufSize = 6 * ipconfigTCP_MSS;\r
 246         xWinProps.lRxWinSize = 3;\r
 247 \r
 248         /* Set the window and buffer sizes. */\r
 249         FreeRTOS_setsockopt( xListeningSocket, 0, FREERTOS_SO_WIN_PROPERTIES, ( void * ) &xWinProps, sizeof( xWinProps ) );\r
 250 \r
 251         /* Bind the socket to the port that the client task will send to, then\r
 252         listen for incoming connections. */\r
 253         xBindAddress.sin_port = tcpechoPORT_NUMBER;\r
 254         xBindAddress.sin_port = FreeRTOS_htons( xBindAddress.sin_port );\r
 255         FreeRTOS_bind( xListeningSocket, &xBindAddress, sizeof( xBindAddress ) );\r
 256         FreeRTOS_listen( xListeningSocket, xBacklog );\r
 257 \r
 258         /* Create the clients that will connect to the listening socket. */\r
 259         prvCreateWindowsThreadClients();\r
 260 \r
 261         for( ;; )\r
 262         {\r
 263                 /* Wait for a client to connect. */\r
 264                 xConnectedSocket = FreeRTOS_accept( xListeningSocket, &xClient, &xSize );\r
 265                 configASSERT( xConnectedSocket != FREERTOS_INVALID_SOCKET );\r
 266 \r
 267                 /* Spawn a task to handle the connection. */\r
 268                 xTaskCreate( prvServerConnectionInstance, "EchoServer", usUsedStackSize, ( void * ) xConnectedSocket, tskIDLE_PRIORITY, NULL );\r
 269         }\r
 270 }\r
 271 /*-----------------------------------------------------------*/\r
 272 \r
 273 static void prvServerConnectionInstance( void *pvParameters )\r
 274 {\r
 275 int32_t lBytes, lSent, lTotalSent;\r
 276 uint8_t cReceivedString[ ipconfigTCP_MSS ];\r
 277 Socket_t xConnectedSocket;\r
 278 static const TickType_t xReceiveTimeOut = pdMS_TO_TICKS( 5000 );\r
 279 static const TickType_t xSendTimeOut = pdMS_TO_TICKS( 5000 );\r
 280 TickType_t xTimeOnShutdown;\r
 281 \r
 282         ulConnectionCount++;\r
 283         xConnectedSocket = ( Socket_t ) pvParameters;\r
 284         FreeRTOS_setsockopt( xConnectedSocket, 0, FREERTOS_SO_RCVTIMEO, &xReceiveTimeOut, sizeof( xReceiveTimeOut ) );\r
 285         FreeRTOS_setsockopt( xConnectedSocket, 0, FREERTOS_SO_SNDTIMEO, &xSendTimeOut, sizeof( xReceiveTimeOut ) );\r
 286 \r
 287         for( ;; )\r
 288         {\r
 289                 /* Zero out the receive array so there is NULL at the end of the string\r
 290                 when it is printed out. */\r
 291                 memset( cReceivedString, 0x00, sizeof( cReceivedString ) );\r
 292 \r
 293                 /* Receive data on the socket. */\r
 294                 lBytes = FreeRTOS_recv( xConnectedSocket, cReceivedString, sizeof( cReceivedString ), 0 );\r
 295 \r
 296                 /* If data was received, echo it back. */\r
 297                 if( lBytes >= 0 )\r
 298                 {\r
 299                         lSent = 0;\r
 300                         lTotalSent = 0;\r
 301 \r
 302                         /* Call send() until all the data has been sent. */\r
 303                         while( ( lSent >= 0 ) && ( lTotalSent < lBytes ) )\r
 304                         {\r
 305                                 lSent = FreeRTOS_send( xConnectedSocket, cReceivedString, lBytes - lTotalSent, 0 );\r
 306                                 lTotalSent += lSent;\r
 307                         }\r
 308 \r
 309                         if( lSent < 0 )\r
 310                         {\r
 311                                 /* Socket closed? */\r
 312                                 break;\r
 313                         }\r
 314                 }\r
 315                 else\r
 316                 {\r
 317                         /* Socket closed? */\r
 318                         break;\r
 319                 }\r
 320         }\r
 321 \r
 322         /* Initiate a shutdown in case it has not already been initiated. */\r
 323         FreeRTOS_shutdown( xConnectedSocket, FREERTOS_SHUT_RDWR );\r
 324 \r
 325         /* Wait for the shutdown to take effect, indicated by FreeRTOS_recv()\r
 326         returning an error. */\r
 327         xTimeOnShutdown = xTaskGetTickCount();\r
 328         do\r
 329         {\r
 330                 if( FreeRTOS_recv( xConnectedSocket, cReceivedString, ipconfigTCP_MSS, 0 ) < 0 )\r
 331                 {\r
 332                         break;\r
 333                 }\r
 334         } while( ( xTaskGetTickCount() - xTimeOnShutdown ) < tcpechoSHUTDOWN_DELAY );\r
 335 \r
 336         /* Finished with the socket and the task. */\r
 337         FreeRTOS_closesocket( xConnectedSocket );\r
 338         vTaskDelete( NULL );\r
 339 }\r
 340 /*-----------------------------------------------------------*/\r
 341 \r
 342 static BaseType_t prvCreateTxData( char *cBuffer, uint32_t ulBufferLength )\r
 343 {\r
 344 BaseType_t lCharactersToAdd, lCharacter;\r
 345 char cChar = '0';\r
 346 \r
 347         /* Randomise the number of characters that will be sent. */\r
 348         do\r
 349         {\r
 350                 lCharactersToAdd = ipconfigRAND32() % ( ulBufferLength - 20UL );\r
 351         } while ( lCharactersToAdd == 0 );\r
 352 \r
 353         /* Fill the buffer. */\r
 354         for( lCharacter = 0; lCharacter < lCharactersToAdd; lCharacter++ )\r
 355         {\r
 356                 cBuffer[ lCharacter ] = cChar;\r
 357                 cChar++;\r
 358 \r
 359                 if( cChar > '~' )\r
 360                 {\r
 361                         cChar = '0';\r
 362                 }\r
 363         }\r
 364 \r
 365         return lCharactersToAdd;\r
 366 }\r
 367 /*-----------------------------------------------------------*/\r
 368 \r
 369 BaseType_t xAreTCPEchoServersStillRunning( void )\r
 370 {\r
 371 static uint32_t ulLastConnectionCount = 0, ulLastClientCycles = 0;\r
 372 BaseType_t xReturn = pdPASS;\r
 373 \r
 374         if( ulConnectionCount == ulLastConnectionCount )\r
 375         {\r
 376                 xReturn = pdFAIL;\r
 377         }\r
 378         else\r
 379         {\r
 380                 ulLastConnectionCount = ulConnectionCount;\r
 381         }\r
 382 \r
 383         if( ulClientCycles == ulLastClientCycles )\r
 384         {\r
 385                 xReturn = pdFAIL;\r
 386         }\r
 387         else\r
 388         {\r
 389                 ulLastClientCycles = ulClientCycles;\r
 390         }\r
 391 \r
 392         return xReturn;\r
 393 }\r
 394 /*-----------------------------------------------------------*/\r
 395 \r
 396 DWORD WINAPI prvSimpleWinsockTCPClientTask( void *pvParameters )\r
 397 {\r
 398 char *pcTransmittedString, *pcReceivedString;\r
 399 BaseType_t lReceived, lTransmitted = 0, lStringLength, lReturned = 0, lInstance;\r
 400 uint32_t ulCount = 0UL, ulMaxCount, ulIPAddress;\r
 401 const uint32_t ulMaxLoopsPerSocket = 100UL;\r
 402 struct sockaddr_in xConnection;\r
 403 SOCKET xClientSocket;\r
 404 int iReturned;\r
 405 TickType_t xTimeOnShutdown;\r
 406 \r
 407         /* Multiple instances of this task are created.  The instance is passed in\r
 408         as the parameter. */\r
 409         lInstance = ( BaseType_t ) pvParameters;\r
 410 \r
 411         /* Locate the buffers for this instance of this task. */\r
 412         pcTransmittedString = &( cTxBuffers[ lInstance ][ 0 ] );\r
 413         pcReceivedString = &( cRxBuffers[ lInstance ][ 0 ] );\r
 414 \r
 415         /* It is assumed that this task is not created until the network is up,\r
 416         so the IP address of the server (which is the FreeRTOS+TCP side of the\r
 417         connection) can be obtained immediately.  Store the IP address being\r
 418         used in ulIPAddress. */\r
 419         FreeRTOS_GetAddressConfiguration( &ulIPAddress, NULL, NULL, NULL );\r
 420 \r
 421         /* Set family and port for client socket. */\r
 422         memset( ( void * ) &xConnection, 0x00, sizeof( struct sockaddr_in ) );\r
 423         xConnection.sin_family = AF_INET;\r
 424         xConnection.sin_addr.s_addr = ulIPAddress;\r
 425         xConnection.sin_port = htons( tcpechoPORT_NUMBER );\r
 426 \r
 427         for( ;; )\r
 428         {\r
 429                 /* Create the socket then connect it to the FreeRTOS+TCP server. */\r
 430                 xClientSocket = socket( AF_INET, SOCK_STREAM, 0 );\r
 431                 configASSERT( xClientSocket != INVALID_SOCKET );\r
 432 \r
 433                 do\r
 434                 {\r
 435                         iReturned = connect( xClientSocket, (const struct sockaddr*) &xConnection, sizeof( xConnection ) );\r
 436                 } while( iReturned != 0 );\r
 437 \r
 438                 ulMaxCount = ipconfigRAND32() % ulMaxLoopsPerSocket;\r
 439 \r
 440                 for( ulCount = 0; ulCount < ulMaxCount; ulCount++ )\r
 441                 {\r
 442                         /* Create a string then send it to the server. */\r
 443                         lStringLength = prvCreateTxData( pcTransmittedString, tcpechoBUFFER_SIZE );\r
 444                         lTransmitted = send( xClientSocket, pcTransmittedString, lStringLength, 0 );\r
 445 \r
 446                         configASSERT( lTransmitted != SOCKET_ERROR );\r
 447                         configASSERT( lTransmitted == lStringLength );\r
 448 \r
 449                         if( lTransmitted == lStringLength )\r
 450                         {\r
 451                                 memset( ( void * ) pcReceivedString, 0x00, tcpechoBUFFER_SIZE );\r
 452                                 lReceived = 0;\r
 453 \r
 454                                 /* Wait for the echoed string. */\r
 455                                 while( lReceived < lTransmitted )\r
 456                                 {\r
 457                                         lReturned = recv( xClientSocket, ( char * ) &( pcReceivedString[ lReceived ] ), lTransmitted - lReceived, 0 );\r
 458 \r
 459                                         if( lReturned >= 0 )\r
 460                                         {\r
 461                                                 /* Data was received. */\r
 462                                                 lReceived += lReturned;\r
 463                                         }\r
 464                                         else\r
 465                                         {\r
 466                                                 /* Error was returned. */\r
 467                                                 ulClientReceiveErrors++;\r
 468                                                 break;\r
 469                                         }\r
 470                                 }\r
 471 \r
 472                                 /* If the socket was not closed, check the number of bytes\r
 473                                 received. */\r
 474                                 if( lReceived == lTransmitted )\r
 475                                 {\r
 476                                         /* Were the expected characters received? */\r
 477                                         configASSERT( memcmp( pcTransmittedString, pcReceivedString, lTransmitted ) == 0x00 );\r
 478                                         if( memcmp( pcTransmittedString, pcReceivedString, lReceived ) != 0x00 )\r
 479                                         {\r
 480                                                 ulIncorrectDataReceived++;\r
 481                                                 break;\r
 482                                         }\r
 483                                         else\r
 484                                         {\r
 485                                                 /* Received expected string, increment the count of\r
 486                                                 successful cycles. */\r
 487                                                 ulClientCycles++;\r
 488                                         }\r
 489                                 }\r
 490                                 else\r
 491                                 {\r
 492                                         /* Socket is being closed or an error occurred.  Don't try\r
 493                                         using the same socket again. */\r
 494                                         break;\r
 495                                 }\r
 496                         }\r
 497                         else\r
 498                         {\r
 499                                 ulClientTransmitErrors++;\r
 500                                 break;\r
 501                         }\r
 502                 }\r
 503 \r
 504                 shutdown( xClientSocket, SD_BOTH );\r
 505                 xTimeOnShutdown = xTaskGetTickCount();\r
 506 \r
 507                 do\r
 508                 {\r
 509                         Sleep( tcpechoWINSOCK_SHUTDOWN_DELAY );\r
 510                         lReturned = recv( xClientSocket, pcReceivedString, lTransmitted, 0 );\r
 511 \r
 512                         if( lReturned < 0 )\r
 513                         {\r
 514                                 break;\r
 515                         }\r
 516                 } while( ( xTaskGetTickCount() - xTimeOnShutdown ) < tcpechoSHUTDOWN_DELAY );\r
 517 \r
 518                 configASSERT( closesocket( xClientSocket ) == 0 );\r
 519 \r
 520                 Sleep( tcpechoLOOP_DELAY );\r
 521         }\r
 522 }\r
 523 /*-----------------------------------------------------------*/\r
 524 \r
 525 /* The whole file is excluded if TCP is not compiled in. */\r
 526 #endif /* ipconfigUSE_TCP */\r
 527 \r