/**
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* \addtogroup rime
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* @{
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*/
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/**
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* \defgroup rimelinkestimate Link estimate management
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*
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* The link estimate module is used for computing estimations of link
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* quality. It computes a quality index for links, based on
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* information about how many times a packet has been transmitted, as
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* well as information about incoming packets. The link estimate
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* module exposes an interface that provides functions that are called
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* for incoming and outgoing packets.
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*/
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/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Header file for the Collect link estimate
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef COLLECT_LINK_ESTIMATE_H
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#define COLLECT_LINK_ESTIMATE_H
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#define COLLECT_LINK_ESTIMATE_UNIT 8
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struct collect_link_estimate {
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uint32_t etx_accumulator;
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uint8_t num_estimates;
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};
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/**
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* \brief Initialize a new link estimate
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* \param le A pointer to a link estimate structure
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*
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* This function initializes a link estimate.
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*/
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void collect_link_estimate_new(struct collect_link_estimate *le);
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/**
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* \brief Update a link estimate when a packet has been sent.
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* \param le A pointer to a link estimate structure
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* \param num_tx The number of times the packet was transmitted before it was ACKed
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*
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* This function updates a link estimate. This function is
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* called when a packet has been sent. The function may
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* use information from the packet buffer and the packet
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* buffer attributes when computing the link estimate.
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*/
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void collect_link_estimate_update_tx(struct collect_link_estimate *le,
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uint8_t num_tx);
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/**
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* \brief Update a link estimate when a packet has failed to be sent.
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* \param le A pointer to a link estimate structure
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* \param num_tx The number of times the packet was transmitted before it was given up on.
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*
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* This function updates a link estimate. This function is
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* called when a packet has been sent. The function may
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* use information from the packet buffer and the packet
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* buffer attributes when computing the link estimate.
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*/
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void collect_link_estimate_update_tx_fail(struct collect_link_estimate *le,
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uint8_t num_tx);
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/**
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* \brief Update a link estimate when a packet has been received.
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* \param le A pointer to a link estimate structure
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*
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* This function updates a link estimate. This function is
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* called when a packet has been received. The function
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* uses information from the packet buffer and its
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* attributes.
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*/
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void collect_link_estimate_update_rx(struct collect_link_estimate *le);
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/**
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* \brief Compute the link estimate metric for a link estimate
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* \param le A pointer to a link estimate structure
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* \return The current link estimate metric
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*
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*/
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uint16_t collect_link_estimate(struct collect_link_estimate *le);
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int collect_link_estimate_num_estimates(struct collect_link_estimate *le);
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#endif /* COLLECT_LINK_ESTIMATE_H */
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/** @} */
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