osd-contiki/core/net/rime/collect.h
adamdunkels 7165a3866f Significant rework of the Contiki data collection protocol:
* the new version makes use of MAC-layer feedback so that bad paths
  can be identified quicker and then avoided.

* the new code uses transport layer ACKs that contain feedback from
  the collect protocol: when a packet cannot be forwarded due to lack
  of resources, the ACK contains a flag that indicates that the packet
  could not be forwarded. ACKs also contain the routing metric of the
  sender, which improves agility in face of rapid path changes.

* loop detection and management has been improved: with higher path
  metric agility, the system is more prone to short-lived routing
  loops. Instead of dropping looping packets, the new version adjusts
  the routing metric for the routes that exhibit loops so that the
  risk for future loops is reduced.

* make use of packet attributes to inform the MAC layer of how many
  times packets should be retransmitted.
2010-02-28 09:18:01 +00:00

116 lines
4 KiB
C

/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimecollect Tree-based hop-by-hop reliable data collection
* @{
*
* The collect module implements a hop-by-hop reliable data collection
* mechanism.
*
* \section channels Channels
*
* The collect module uses 2 channels; one for neighbor discovery and one
* for data packets.
*
*/
/*
* Copyright (c) 2007, 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.
*
* $Id: collect.h,v 1.13 2010/02/28 09:18:01 adamdunkels Exp $
*/
/**
* \file
* Header file for hop-by-hop reliable data collection
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __COLLECT_H__
#define __COLLECT_H__
#include "net/rime/announcement.h"
#include "net/rime/runicast.h"
#include "net/rime/neighbor-discovery.h"
#define COLLECT_PACKET_ID_BITS 4
#define COLLECT_ATTRIBUTES { PACKETBUF_ADDR_ESENDER, PACKETBUF_ADDRSIZE }, \
{ PACKETBUF_ATTR_EPACKET_ID, PACKETBUF_ATTR_BIT * 4 }, \
{ PACKETBUF_ATTR_PACKET_ID, PACKETBUF_ATTR_BIT * COLLECT_PACKET_ID_BITS }, \
{ PACKETBUF_ATTR_TTL, PACKETBUF_ATTR_BIT * 4 }, \
{ PACKETBUF_ATTR_HOPS, PACKETBUF_ATTR_BIT * 4 }, \
{ PACKETBUF_ATTR_MAX_REXMIT, PACKETBUF_ATTR_BIT * 3 }, \
{ PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_BIT }, \
UNICAST_ATTRIBUTES
struct collect_callbacks {
void (* recv)(const rimeaddr_t *originator, uint8_t seqno,
uint8_t hops);
};
struct collect_conn {
struct unicast_conn unicast_conn;
#if ! COLLECT_CONF_ANNOUNCEMENTS
struct neighbor_discovery_conn neighbor_discovery_conn;
#else /* ! COLLECT_CONF_ANNOUNCEMENTS */
struct announcement announcement;
#endif /* COLLECT_CONF_ANNOUNCEMENTS */
const struct collect_callbacks *cb;
struct ctimer t;
uint16_t rtmetric;
uint8_t sending, transmissions, max_rexmits;
uint8_t seqno, last_received_seqno;
rimeaddr_t last_received_addr;
uint8_t eseqno;
struct ctimer retransmission_timer;
rimeaddr_t current_receiver;
};
void collect_open(struct collect_conn *c, uint16_t channels,
const struct collect_callbacks *callbacks);
void collect_close(struct collect_conn *c);
int collect_send(struct collect_conn *c, int rexmits);
void collect_set_sink(struct collect_conn *c, int should_be_sink);
int collect_depth(struct collect_conn *c);
#define COLLECT_MAX_DEPTH 255
#endif /* __COLLECT_H__ */
/** @} */
/** @} */