/*
    FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.

    >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
    distribute a combined work that includes FreeRTOS without being obliged to
    provide the source code for proprietary components outside of the FreeRTOS
    kernel.

    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
    details. You should have received a copy of the GNU General Public License
    and the FreeRTOS license exception along with FreeRTOS; if not it can be
    viewed here: http://www.freertos.org/a00114.html and also obtained by
    writing to Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
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     *    not run, what could be wrong?"                                     *
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    ***************************************************************************


    http://www.FreeRTOS.org - Documentation, books, training, latest versions, 
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, and our new
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
    indemnification and middleware, under the OpenRTOS brand.
    
    http://www.SafeRTOS.com - High Integrity Systems also provide a safety 
    engineered and independently SIL3 certified version for use in safety and 
    mission critical applications that require provable dependability.
*/

 /******************************************************************************
 *
 * See the following URL for information on the commands defined in this file:
 * http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_UDP/Embedded_Ethernet_Examples/Ethernet_Related_CLI_Commands.shtml
 *
 ******************************************************************************/


/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Standard includes. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

/* FreeRTOS+CLI includes. */
#include "FreeRTOS_CLI.h"

/* FreeRTOS+UDP includes, just to make the stats available to the CLI
commands. */
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_Sockets.h"

#ifndef  configINCLUDE_TRACE_RELATED_CLI_COMMANDS
	#define configINCLUDE_TRACE_RELATED_CLI_COMMANDS 0
#endif


/*
 * Implements the run-time-stats command.
 */
static portBASE_TYPE prvTaskStatsCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Implements the task-stats command.
 */
static portBASE_TYPE prvRunTimeStatsCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Implements the echo-three-parameters command.
 */
static portBASE_TYPE prvThreeParameterEchoCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Implements the echo-parameters command.
 */
static portBASE_TYPE prvParameterEchoCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Defines a command that prints out IP address information.
 */
static portBASE_TYPE prvDisplayIPConfig( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Defines a command that prints out the gathered demo debug stats.
 */
static portBASE_TYPE prvDisplayIPDebugStats( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Defines a command that sends an ICMP ping request to an IP address.
 */
static portBASE_TYPE prvPingCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );

/*
 * Implements the "trace start" and "trace stop" commands;
 */
#if configINCLUDE_TRACE_RELATED_CLI_COMMANDS == 1
	static portBASE_TYPE prvStartStopTraceCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString );
#endif

/* Structure that defines the "ip-config" command line command. */
static const CLI_Command_Definition_t xIPConfig =
{
	( const int8_t * const ) "ip-config",
	( const int8_t * const ) "ip-config:\r\n Displays IP address configuration\r\n\r\n",
	prvDisplayIPConfig,
	0
};

#if configINCLUDE_DEMO_DEBUG_STATS != 0
	/* Structure that defines the "ip-debug-stats" command line command. */
	static const CLI_Command_Definition_t xIPDebugStats =
	{
		( const int8_t * const ) "ip-debug-stats", /* The command string to type. */
		( const int8_t * const ) "ip-debug-stats:\r\n Shows some IP stack stats useful for debug - an example only.\r\n\r\n",
		prvDisplayIPDebugStats, /* The function to run. */
		0 /* No parameters are expected. */
	};
#endif /* configINCLUDE_DEMO_DEBUG_STATS */

/* Structure that defines the "run-time-stats" command line command.   This
generates a table that shows how much run time each task has */
static const CLI_Command_Definition_t xRunTimeStats =
{
	( const int8_t * const ) "run-time-stats", /* The command string to type. */
	( const int8_t * const ) "run-time-stats:\r\n Displays a table showing how much processing time each FreeRTOS task has used\r\n\r\n",
	prvRunTimeStatsCommand, /* The function to run. */
	0 /* No parameters are expected. */
};

/* Structure that defines the "task-stats" command line command.  This generates
a table that gives information on each task in the system. */
static const CLI_Command_Definition_t xTaskStats =
{
	( const int8_t * const ) "task-stats", /* The command string to type. */
	( const int8_t * const ) "task-stats:\r\n Displays a table showing the state of each FreeRTOS task\r\n\r\n",
	prvTaskStatsCommand, /* The function to run. */
	0 /* No parameters are expected. */
};

/* Structure that defines the "echo_3_parameters" command line command.  This
takes exactly three parameters that the command simply echos back one at a
time. */
static const CLI_Command_Definition_t xThreeParameterEcho =
{
	( const int8_t * const ) "echo-3-parameters",
	( const int8_t * const ) "echo-3-parameters <param1> <param2> <param3>:\r\n Expects three parameters, echos each in turn\r\n\r\n",
	prvThreeParameterEchoCommand, /* The function to run. */
	3 /* Three parameters are expected, which can take any value. */
};

/* Structure that defines the "echo_parameters" command line command.  This
takes a variable number of parameters that the command simply echos back one at
a time. */
static const CLI_Command_Definition_t xParameterEcho =
{
	( const int8_t * const ) "echo-parameters",
	( const int8_t * const ) "echo-parameters <...>:\r\n Take variable number of parameters, echos each in turn\r\n\r\n",
	prvParameterEchoCommand, /* The function to run. */
	-1 /* The user can enter any number of commands. */
};

#if ipconfigSUPPORT_OUTGOING_PINGS == 1

	/* Structure that defines the "ping" command line command.  This takes an IP
	address or host name and (optionally) the number of bytes to ping as
	parameters. */
	static const CLI_Command_Definition_t xPing =
	{
		( const int8_t * const ) "ping",
		( const int8_t * const ) "ping <ipaddress> <optional:bytes to send>:\r\n for example, ping 192.168.0.3 8, or ping www.example.com\r\n\r\n",
		prvPingCommand, /* The function to run. */
		-1 /* Ping can take either one or two parameter, so the number of parameters has to be determined by the ping command implementation. */
	};

#endif /* ipconfigSUPPORT_OUTGOING_PINGS */

#if configINCLUDE_TRACE_RELATED_CLI_COMMANDS == 1
	/* Structure that defines the "trace" command line command.  This takes a single
	parameter, which can be either "start" or "stop". */
	static const CLI_Command_Definition_t xStartStopTrace =
	{
		( const int8_t * const ) "trace",
		( const int8_t * const ) "trace [start | stop]:\r\n Starts or stops a trace recording for viewing in FreeRTOS+Trace\r\n\r\n",
		prvStartStopTraceCommand, /* The function to run. */
		1 /* One parameter is expected.  Valid values are "start" and "stop". */
	};
#endif /* configINCLUDE_TRACE_RELATED_CLI_COMMANDS */

/*-----------------------------------------------------------*/

void vRegisterCLICommands( void )
{
	/* Register all the command line commands defined immediately above. */
	FreeRTOS_CLIRegisterCommand( &xTaskStats );
	FreeRTOS_CLIRegisterCommand( &xRunTimeStats );
	FreeRTOS_CLIRegisterCommand( &xThreeParameterEcho );
	FreeRTOS_CLIRegisterCommand( &xParameterEcho );
	FreeRTOS_CLIRegisterCommand( &xIPDebugStats );
	FreeRTOS_CLIRegisterCommand( &xIPConfig );

	#if ipconfigSUPPORT_OUTGOING_PINGS == 1
	{
		FreeRTOS_CLIRegisterCommand( &xPing );
	}
	#endif /* ipconfigSUPPORT_OUTGOING_PINGS */

	#if configINCLUDE_TRACE_RELATED_CLI_COMMANDS == 1
		FreeRTOS_CLIRegisterCommand( & xStartStopTrace );
	#endif
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvTaskStatsCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
{
const int8_t *const pcHeader = ( int8_t * ) "Task          State  Priority  Stack	#\r\n************************************************\r\n";

	/* Remove compile time warnings about unused parameters, and check the
	write buffer is not NULL.  NOTE - for simplicity, this example assumes the
	write buffer length is adequate, so does not check for buffer overflows. */
	( void ) pcCommandString;
	( void ) xWriteBufferLen;
	configASSERT( pcWriteBuffer );

	/* Generate a table of task stats. */
	strcpy( ( char * ) pcWriteBuffer, ( char * ) pcHeader );
	vTaskList( pcWriteBuffer + strlen( ( char * ) pcHeader ) );

	/* There is no more data to return after this single string, so return
	pdFALSE. */
	return pdFALSE;
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvRunTimeStatsCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
{
const int8_t * const pcHeader = ( int8_t * ) "Task            Abs Time      % Time\r\n****************************************\r\n";

	/* Remove compile time warnings about unused parameters, and check the
	write buffer is not NULL.  NOTE - for simplicity, this example assumes the
	write buffer length is adequate, so does not check for buffer overflows. */
	( void ) pcCommandString;
	( void ) xWriteBufferLen;
	configASSERT( pcWriteBuffer );

	/* Generate a table of task stats. */
	strcpy( ( char * ) pcWriteBuffer, ( char * ) pcHeader );
	vTaskGetRunTimeStats( pcWriteBuffer + strlen( ( char * ) pcHeader ) );

	/* There is no more data to return after this single string, so return
	pdFALSE. */
	return pdFALSE;
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvThreeParameterEchoCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
{
int8_t *pcParameter;
portBASE_TYPE xParameterStringLength, xReturn;
static portBASE_TYPE lParameterNumber = 0;

	/* Remove compile time warnings about unused parameters, and check the
	write buffer is not NULL.  NOTE - for simplicity, this example assumes the
	write buffer length is adequate, so does not check for buffer overflows. */
	( void ) pcCommandString;
	( void ) xWriteBufferLen;
	configASSERT( pcWriteBuffer );

	if( lParameterNumber == 0 )
	{
		/* The first time the function is called after the command has been
		entered just a header string is returned. */
		sprintf( ( char * ) pcWriteBuffer, "The three parameters were:\r\n" );

		/* Next time the function is called the first parameter will be echoed
		back. */
		lParameterNumber = 1L;

		/* There is more data to be returned as no parameters have been echoed
		back yet. */
		xReturn = pdPASS;
	}
	else
	{
		/* Obtain the parameter string. */
		pcParameter = ( int8_t * ) FreeRTOS_CLIGetParameter
									(
										pcCommandString,		/* The command string itself. */
										lParameterNumber,		/* Return the next parameter. */
										&xParameterStringLength	/* Store the parameter string length. */
									);

		/* Sanity check something was returned. */
		configASSERT( pcParameter );

		/* Return the parameter string. */
		memset( pcWriteBuffer, 0x00, xWriteBufferLen );
		sprintf( ( char * ) pcWriteBuffer, "%d: ", ( int ) lParameterNumber );
		strncat( ( char * ) pcWriteBuffer, ( const char * ) pcParameter, xParameterStringLength );
		strncat( ( char * ) pcWriteBuffer, "\r\n", strlen( "\r\n" ) );

		/* If this is the last of the three parameters then there are no more
		strings to return after this one. */
		if( lParameterNumber == 3L )
		{
			/* If this is the last of the three parameters then there are no more
			strings to return after this one. */
			xReturn = pdFALSE;
			lParameterNumber = 0L;
		}
		else
		{
			/* There are more parameters to return after this one. */
			xReturn = pdTRUE;
			lParameterNumber++;
		}
	}

	return xReturn;
}
/*-----------------------------------------------------------*/

static portBASE_TYPE prvParameterEchoCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
{
int8_t *pcParameter;
portBASE_TYPE xParameterStringLength, xReturn;
static portBASE_TYPE lParameterNumber = 0;

	/* Remove compile time warnings about unused parameters, and check the
	write buffer is not NULL.  NOTE - for simplicity, this example assumes the
	write buffer length is adequate, so does not check for buffer overflows. */
	( void ) pcCommandString;
	( void ) xWriteBufferLen;
	configASSERT( pcWriteBuffer );

	if( lParameterNumber == 0 )
	{
		/* The first time the function is called after the command has been
		entered just a header string is returned. */
		sprintf( ( char * ) pcWriteBuffer, "The parameters were:\r\n" );

		/* Next time the function is called the first parameter will be echoed
		back. */
		lParameterNumber = 1L;

		/* There is more data to be returned as no parameters have been echoed
		back yet. */
		xReturn = pdPASS;
	}
	else
	{
		/* Obtain the parameter string. */
		pcParameter = ( int8_t * ) FreeRTOS_CLIGetParameter
									(
										pcCommandString,		/* The command string itself. */
										lParameterNumber,		/* Return the next parameter. */
										&xParameterStringLength	/* Store the parameter string length. */
									);

		if( pcParameter != NULL )
		{
			/* Return the parameter string. */
			memset( pcWriteBuffer, 0x00, xWriteBufferLen );
			sprintf( ( char * ) pcWriteBuffer, "%d: ", ( int ) lParameterNumber );
			strncat( ( char * ) pcWriteBuffer, ( const char * ) pcParameter, xParameterStringLength );
			strncat( ( char * ) pcWriteBuffer, "\r\n", strlen( "\r\n" ) );

			/* There might be more parameters to return after this one. */
			xReturn = pdTRUE;
			lParameterNumber++;
		}
		else
		{
			/* No more parameters were found.  Make sure the write buffer does
			not contain a valid string. */
			pcWriteBuffer[ 0 ] = 0x00;

			/* No more data to return. */
			xReturn = pdFALSE;

			/* Start over the next time this command is executed. */
			lParameterNumber = 0;
		}
	}

	return xReturn;
}
/*-----------------------------------------------------------*/

#if ipconfigSUPPORT_OUTGOING_PINGS == 1

	static portBASE_TYPE prvPingCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
	{
	int8_t * pcParameter;
	portBASE_TYPE lParameterStringLength, xReturn;
	uint32_t ulIPAddress, ulBytesToPing;
	const uint32_t ulDefaultBytesToPing = 8UL;
	int8_t cBuffer[ 16 ];

		/* Remove compile time warnings about unused parameters, and check the
		write buffer is not NULL.  NOTE - for simplicity, this example assumes the
		write buffer length is adequate, so does not check for buffer overflows. */
		( void ) pcCommandString;
		( void ) xWriteBufferLen;
		configASSERT( pcWriteBuffer );

		/* Start with an empty string. */
		pcWriteBuffer[ 0 ] = 0x00;

		/* Obtain the number of bytes to ping. */
		pcParameter = ( int8_t * ) FreeRTOS_CLIGetParameter
									(
										pcCommandString,		/* The command string itself. */
										2,						/* Return the second parameter. */
										&lParameterStringLength	/* Store the parameter string length. */
									);

		if( pcParameter == NULL )
		{
			/* The number of bytes was not specified, so default it. */
			ulBytesToPing = ulDefaultBytesToPing;
		}
		else
		{
			ulBytesToPing = atol( ( const char * ) pcParameter );
		}

		/* Obtain the IP address string. */
		pcParameter = ( int8_t * ) FreeRTOS_CLIGetParameter
									(
										pcCommandString,		/* The command string itself. */
										1,						/* Return the first parameter. */
										&lParameterStringLength	/* Store the parameter string length. */
									);

		/* Sanity check something was returned. */
		configASSERT( pcParameter );

		/* Attempt to obtain the IP address.   If the first character is not a
		digit, assume the host name has been passed in. */
		if( ( *pcParameter >= '0' ) && ( *pcParameter <= '9' ) )
		{
			ulIPAddress = FreeRTOS_inet_addr( ( const uint8_t * ) pcParameter );
		}
		else
		{
			/* Terminate the host name. */
			pcParameter[ lParameterStringLength ] = 0x00;

			/* Attempt to resolve host. */
			ulIPAddress = FreeRTOS_gethostbyname( ( uint8_t * ) pcParameter );
		}

		/* Convert IP address, which may have come from a DNS lookup, to string. */
		FreeRTOS_inet_ntoa( ulIPAddress, ( char * ) cBuffer );

		if( ulIPAddress != 0 )
		{
			xReturn = FreeRTOS_SendPingRequest( ulIPAddress, ( uint16_t ) ulBytesToPing, portMAX_DELAY );
		}
		else
		{
			xReturn = pdFALSE;
		}

		if( xReturn == pdFALSE )
		{
			sprintf( ( char * ) pcWriteBuffer, "%s", "Could not send ping request\r\n" );
		}
		else
		{
			sprintf( ( char * ) pcWriteBuffer, "Ping sent to %s with identifier %d\r\n", cBuffer, xReturn );
		}

		return pdFALSE;
	}
	/*-----------------------------------------------------------*/

#endif /* ipconfigSUPPORT_OUTGOING_PINGS */

#if configINCLUDE_DEMO_DEBUG_STATS != 0

	static portBASE_TYPE prvDisplayIPDebugStats( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
	{
	static portBASE_TYPE xIndex = -1;
	extern xExampleDebugStatEntry_t xIPTraceValues[];
	portBASE_TYPE xReturn;

		/* Remove compile time warnings about unused parameters, and check the
		write buffer is not NULL.  NOTE - for simplicity, this example assumes the
		write buffer length is adequate, so does not check for buffer overflows. */
		( void ) pcCommandString;
		( void ) xWriteBufferLen;
		configASSERT( pcWriteBuffer );

		xIndex++;

		if( xIndex < xExampleDebugStatEntries() )
		{
			sprintf( ( char * ) pcWriteBuffer, "%s %d\r\n", ( char * ) xIPTraceValues[ xIndex ].pucDescription, ( int ) xIPTraceValues[ xIndex ].ulData );
			xReturn = pdPASS;
		}
		else
		{
			/* Reset the index for the next time it is called. */
			xIndex = -1;

			/* Ensure nothing remains in the write buffer. */
			pcWriteBuffer[ 0 ] = 0x00;
			xReturn = pdFALSE;
		}

		return xReturn;
	}
	/*-----------------------------------------------------------*/

#endif /* configINCLUDE_DEMO_DEBUG_STATS */

static portBASE_TYPE prvDisplayIPConfig( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
{
static portBASE_TYPE xIndex = 0;
portBASE_TYPE xReturn;
uint32_t ulAddress;

	/* Remove compile time warnings about unused parameters, and check the
	write buffer is not NULL.  NOTE - for simplicity, this example assumes the
	write buffer length is adequate, so does not check for buffer overflows. */
	( void ) pcCommandString;
	( void ) xWriteBufferLen;
	configASSERT( pcWriteBuffer );

	switch( xIndex )
	{
		case 0 :
			FreeRTOS_GetAddressConfiguration( &ulAddress, NULL, NULL, NULL );
			sprintf( ( char * ) pcWriteBuffer, "\r\nIP address " );
			xReturn = pdTRUE;
			xIndex++;
			break;

		case 1 :
			FreeRTOS_GetAddressConfiguration( NULL, &ulAddress, NULL, NULL );
			sprintf( ( char * ) pcWriteBuffer, "\r\nNet mask " );
			xReturn = pdTRUE;
			xIndex++;
			break;

		case 2 :
			FreeRTOS_GetAddressConfiguration( NULL, NULL, &ulAddress, NULL );
			sprintf( ( char * ) pcWriteBuffer, "\r\nGateway address " );
			xReturn = pdTRUE;
			xIndex++;
			break;

		case 3 :
			FreeRTOS_GetAddressConfiguration( NULL, NULL, NULL, &ulAddress );
			sprintf( ( char * ) pcWriteBuffer, "\r\nDNS server address " );
			xReturn = pdTRUE;
			xIndex++;
			break;

		default :
			ulAddress = 0;
			sprintf( ( char * ) pcWriteBuffer, "\r\n\r\n" );
			xReturn = pdFALSE;
			xIndex = 0;
			break;
	}

	if( ulAddress != 0 )
	{
		FreeRTOS_inet_ntoa( ulAddress, ( ( char * ) &( pcWriteBuffer[ strlen( ( char * ) pcWriteBuffer ) ] ) ) );
	}

	return xReturn;
}
/*-----------------------------------------------------------*/

#if configINCLUDE_TRACE_RELATED_CLI_COMMANDS == 1

	static portBASE_TYPE prvStartStopTraceCommand( int8_t *pcWriteBuffer, size_t xWriteBufferLen, const int8_t *pcCommandString )
	{
	int8_t *pcParameter;
	portBASE_TYPE lParameterStringLength;

		/* Remove compile time warnings about unused parameters, and check the
		write buffer is not NULL.  NOTE - for simplicity, this example assumes the
		write buffer length is adequate, so does not check for buffer overflows. */
		( void ) pcCommandString;
		( void ) xWriteBufferLen;
		configASSERT( pcWriteBuffer );

		/* Obtain the parameter string. */
		pcParameter = ( int8_t * ) FreeRTOS_CLIGetParameter
									(
										pcCommandString,		/* The command string itself. */
										1,						/* Return the first parameter. */
										&lParameterStringLength	/* Store the parameter string length. */
									);

		/* Sanity check something was returned. */
		configASSERT( pcParameter );

		/* There are only two valid parameter values. */
		if( strncmp( ( const char * ) pcParameter, "start", strlen( "start" ) ) == 0 )
		{
			/* Start or restart the trace. */
			vTraceStop();
			vTraceClear();
			vTraceStart();

			sprintf( ( char * ) pcWriteBuffer, "Trace recording (re)started.\r\n" );
		}
		else if( strncmp( ( const char * ) pcParameter, "stop", strlen( "stop" ) ) == 0 )
		{
			/* End the trace, if one is running. */
			vTraceStop();
			sprintf( ( char * ) pcWriteBuffer, "Stopping trace recording.\r\n" );
		}
		else
		{
			sprintf( ( char * ) pcWriteBuffer, "Valid parameters are 'start' and 'stop'.\r\n" );
		}

		/* There is no more data to return after this single string, so return
		pdFALSE. */
		return pdFALSE;
	}

#endif /* configINCLUDE_TRACE_RELATED_CLI_COMMANDS */