nes-proj/core/net/rime/runicast.h

118 lines
4.2 KiB
C

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