contiki/core/net/rime/neighbor-discovery.c

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/**
* \addtogroup rimeneighbordiscovery
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* @{
*/
/*
* 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.
*
* $Id: neighbor-discovery.c,v 1.12 2009/02/07 18:43:45 adamdunkels Exp $
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*/
/**
* \file
* Neighbor discovery
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* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/neighbor.h"
#include "net/rime/neighbor-discovery.h"
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#include "dev/radio-sensor.h"
#include "lib/rand.h"
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#if CONTIKI_TARGET_NETSIM
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#include "ether.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stddef.h>
struct adv_msg {
uint16_t val;
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};
#define SINK 0
#define HOPCOUNT_MAX TREE_MAX_DEPTH
#define MAX_HOPLIM 10
/*#define MAX_INTERVAL CLOCK_SECOND * 60
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#define MIN_INTERVAL CLOCK_SECOND * 10
#define NEW_VAL_INTERVAL CLOCK_SECOND * 2*/
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
send_adv(void *ptr)
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{
struct neighbor_discovery_conn *c = ptr;
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struct adv_msg *hdr;
rimebuf_clear();
rimebuf_set_datalen(sizeof(struct adv_msg));
hdr = rimebuf_dataptr();
hdr->val = c->val;
broadcast_send(&c->c);
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if(c->u->sent) {
c->u->sent(c);
}
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PRINTF("%d.%d: sending neighbor advertisement with val %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
c->val);
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}
/*---------------------------------------------------------------------------*/
static void
adv_packet_received(struct broadcast_conn *ibc, rimeaddr_t *from)
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{
struct neighbor_discovery_conn *c = (struct neighbor_discovery_conn *)ibc;
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struct adv_msg *msg = rimebuf_dataptr();
PRINTF("%d.%d: adv_packet_received from %d.%d with val %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1], msg->val);
/* If we receive an announcement with a lower value than ours, we
cancel our own announcement. */
if(msg->val < c->val) {
ctimer_stop(&c->send_timer);
}
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if(c->u->recv) {
c->u->recv(c, from, msg->val);
}
}
/*---------------------------------------------------------------------------*/
static void
send_timer(void *ptr)
{
struct neighbor_discovery_conn *tc = ptr;
ctimer_set(&tc->send_timer,
tc->max_interval / 2 + rand() % (tc->max_interval / 2),
send_adv, tc);
ctimer_set(&tc->interval_timer,
tc->max_interval,
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send_timer, tc);
}
/*---------------------------------------------------------------------------*/
static CC_CONST_FUNCTION struct broadcast_callbacks broadcast_callbacks =
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{adv_packet_received};
/*---------------------------------------------------------------------------*/
void
neighbor_discovery_open(struct neighbor_discovery_conn *c, uint16_t channel,
clock_time_t initial,
clock_time_t min,
clock_time_t max,
const struct neighbor_discovery_callbacks *cb)
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{
broadcast_open(&c->c, channel, &broadcast_callbacks);
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c->u = cb;
c->initial_interval = initial;
c->min_interval = min;
c->max_interval = max;
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}
/*---------------------------------------------------------------------------*/
void
neighbor_discovery_close(struct neighbor_discovery_conn *c)
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{
broadcast_close(&c->c);
ctimer_stop(&c->send_timer);
ctimer_stop(&c->interval_timer);
}
/*---------------------------------------------------------------------------*/
void
neighbor_discovery_set_val(struct neighbor_discovery_conn *c, uint16_t val)
{
c->val = val;
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}
/*---------------------------------------------------------------------------*/
void
neighbor_discovery_start(struct neighbor_discovery_conn *c, uint16_t val)
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{
clock_time_t interval;
if(val < c->val) {
interval = c->initial_interval;
} else {
interval = c->min_interval;
}
c->val = val;
ctimer_set(&c->interval_timer, interval, send_timer, c);
ctimer_set(&c->send_timer, interval / 2 + rand() % (interval / 2),
send_adv, c);
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}
/*---------------------------------------------------------------------------*/
/** @} */