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
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

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

#include "mesh_forwarder.hpp"

#if OPENTHREAD_MTD

namespace ot {

Error MeshForwarder::SendMessage(Message &aMessage)
{
    aMessage.SetDirectTransmission();
    aMessage.SetOffset(0);
    aMessage.SetDatagramTag(0);
    aMessage.SetTimestampToNow();

    mSendQueue.Enqueue(aMessage);
    mScheduleTransmissionTask.Post();

    return kErrorNone;
}

Error MeshForwarder::EvictMessage(Message::Priority aPriority)
{
    Error    error = kErrorNotFound;
    Message *message;

#if OPENTHREAD_CONFIG_DELAY_AWARE_QUEUE_MANAGEMENT_ENABLE
    error = RemoveAgedMessages();
    VerifyOrExit(error == kErrorNotFound);
#endif

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

    if (message->GetPriority() < static_cast<uint8_t>(aPriority))
    {
        RemoveMessage(*message);
        ExitNow(error = kErrorNone);
    }

exit:
    return error;
}

} // namespace ot

#endif // OPENTHREAD_MTD