src/core/thread/mesh_forwarder_mtd.cpp

/*
 *  Copyright (c) 2018, 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
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 */

/**
 * @file
 *   This file implements MTD-specific mesh forwarding of IPv6/6LoWPAN messages.
 */

#if OPENTHREAD_MTD

#include "mesh_forwarder.hpp"

namespace ot {

otError MeshForwarder::SendMessage(Message &aMessage)
{
    otError error;

    aMessage.SetDirectTransmission();
    aMessage.SetOffset(0);
    aMessage.SetDatagramTag(0);

    SuccessOrExit(error = mSendQueue.Enqueue(aMessage));
    mScheduleTransmissionTask.Post();

exit:
    return error;
}

otError MeshForwarder::EvictMessage(uint8_t aPriority)
{
    otError  error = OT_ERROR_NOT_FOUND;
    Message *message;

    VerifyOrExit((message = mSendQueue.GetTail()) != NULL);

    if (message->GetPriority() < aPriority)
    {
        RemoveMessage(*message);
        ExitNow(error = OT_ERROR_NONE);
    }

exit:
    return error;
}

} // namespace ot

#endif // OPENTHREAD_MTD