118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/**
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* \addtogroup rime
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* @{
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*/
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/**
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* \defgroup rimerunicast Single-hop reliable unicast
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* @{
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*
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* The reliable single-hop unicast primitive (runicast) reliably sends
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* a packet to a single-hop neighbor. The runicast primitive uses
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* acknowledgements and retransmissions to ensure that the neighbor
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* successfully receives the packet. When the receiver has
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* acknowledged the packet, the ruc module notifies the sending
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* application via a callback. The ruc primitive uses the stubborn
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* single-hop unicast primitive to do retransmissions. Thus, the ruc
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* primitive does not have to manage the details of setting up timers
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* and doing retransmissions, but can concentrate on dealing with
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* acknowledgements.
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*
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* The runicast primitive adds two packet attributes: the single-hop
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* packet type and the single-hop packet ID. The runicast primitive
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* uses the packet ID attribute as a sequence number for matching
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* acknowledgement packets to the corresponding data packets.
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*
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* The application or protocol that uses the runicast primitive can
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* specify the maximum number of transmissions that the ruc module
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* should attempt before the packet times out. If a packet times out,
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* the application or protocol that sent the packet is notified with a
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* callback.
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*
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*
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* \section channels Channels
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*
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* The runicast module uses 1 channel.
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*
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*/
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/*
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* Copyright (c) 2006, 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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* Reliable unicast header file
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef RUNICAST_H_
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#define RUNICAST_H_
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#include "net/rime/stunicast.h"
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struct runicast_conn;
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#define RUNICAST_PACKET_ID_BITS 2
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#define RUNICAST_ATTRIBUTES { PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_BIT }, \
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{ PACKETBUF_ATTR_PACKET_ID, PACKETBUF_ATTR_BIT * RUNICAST_PACKET_ID_BITS }, \
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STUNICAST_ATTRIBUTES
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struct runicast_callbacks {
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void (* recv)(struct runicast_conn *c, const rimeaddr_t *from, uint8_t seqno);
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void (* sent)(struct runicast_conn *c, const rimeaddr_t *to, uint8_t retransmissions);
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void (* timedout)(struct runicast_conn *c, const rimeaddr_t *to, uint8_t retransmissions);
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};
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struct runicast_conn {
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struct stunicast_conn c;
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const struct runicast_callbacks *u;
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uint8_t sndnxt;
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uint8_t is_tx;
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uint8_t rxmit;
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uint8_t max_rxmit;
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};
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void runicast_open(struct runicast_conn *c, uint16_t channel,
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const struct runicast_callbacks *u);
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void runicast_close(struct runicast_conn *c);
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int runicast_send(struct runicast_conn *c, const rimeaddr_t *receiver,
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uint8_t max_retransmissions);
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uint8_t runicast_is_transmitting(struct runicast_conn *c);
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#endif /* RUNICAST_H_ */
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/** @} */
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/** @} */
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