OpenThread Example: receiving raw IPv6 datagrams

main.c

/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

#include <assert.h>
#include <stdio.h>

#include <openthread-core-config.h>
#include <openthread/config.h>

#include <openthread/cli.h>
#include <openthread/diag.h>
#include <openthread/ip6.h>
#include <openthread/message.h>
#include <openthread/tasklet.h>
#include <openthread/platform/logging.h>

#include "openthread-system.h"

#if OPENTHREAD_EXAMPLES_POSIX
#include <setjmp.h>
#include <unistd.h>

jmp_buf gResetJump;

void __gcov_flush();
#endif

#if OPENTHREAD_ENABLE_MULTIPLE_INSTANCES
void *otPlatCAlloc(size_t aNum, size_t aSize)
{
    return calloc(aNum, aSize);
}

void otPlatFree(void *aPtr)
{
    free(aPtr);
}
#endif

void otTaskletsSignalPending(otInstance *aInstance)
{
    (void)aInstance;
}

void processIp6Message(otMessage *aMessage, void *aContext)
{
    OT_UNUSED_VARIABLE(aMessage);
    OT_UNUSED_VARIABLE(aContext);

    printf("received IPv6 message!\r\n");
}

int main(int argc, char *argv[])
{
    otInstance *instance;

#if OPENTHREAD_EXAMPLES_POSIX
    if (setjmp(gResetJump))
    {
        alarm(0);
#if OPENTHREAD_ENABLE_COVERAGE
        __gcov_flush();
#endif
        execvp(argv[0], argv);
    }
#endif

#if OPENTHREAD_ENABLE_MULTIPLE_INSTANCES
    size_t   otInstanceBufferLength = 0;
    uint8_t *otInstanceBuffer       = NULL;
#endif

pseudo_reset:

    otSysInit(argc, argv);

#if OPENTHREAD_ENABLE_MULTIPLE_INSTANCES
    // Call to query the buffer size
    (void)otInstanceInit(NULL, &otInstanceBufferLength);

    // Call to allocate the buffer
    otInstanceBuffer = (uint8_t *)malloc(otInstanceBufferLength);
    assert(otInstanceBuffer);

    // Initialize OpenThread with the buffer
    instance = otInstanceInit(otInstanceBuffer, &otInstanceBufferLength);
#else
    instance = otInstanceInitSingle();
#endif
    assert(instance);

    otIp6SetReceiveCallback(instance, processIp6Message, NULL);

    otCliUartInit(instance);

#if OPENTHREAD_ENABLE_DIAG
    otDiagInit(instance);
#endif

    while (!otSysPseudoResetWasRequested())
    {
        otTaskletsProcess(instance);
        otSysProcessDrivers(instance);
    }

    otInstanceFinalize(instance);
#if OPENTHREAD_ENABLE_MULTIPLE_INSTANCES
    free(otInstanceBuffer);
#endif

    goto pseudo_reset;

    return 0;
}

/*
 * Provide, if required an "otPlatLog()" function
 */
#if OPENTHREAD_CONFIG_LOG_OUTPUT == OPENTHREAD_CONFIG_LOG_OUTPUT_APP
void otPlatLog(otLogLevel aLogLevel, otLogRegion aLogRegion, const char *aFormat, ...)
{
    OT_UNUSED_VARIABLE(aLogLevel);
    OT_UNUSED_VARIABLE(aLogRegion);
    OT_UNUSED_VARIABLE(aFormat);

    va_list ap;
    va_start(ap, aFormat);
    otCliPlatLogv(aLogLevel, aLogRegion, aFormat, ap);
    va_end(ap);
}
#endif