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Broadcast announcement back-end that sends announcement data as broadcasts, with increasing transmission intervals

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adamdunkels 2010-03-19 13:15:19 +00:00
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225
core/net/rime/broadcast-announcement.c Normal file
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/**
* \addtogroup rimeexamples
* @{
*/
/*
* 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: broadcast-announcement.c,v 1.1 2010/03/19 13:15:19 adamdunkels Exp $
*/
/**
* \file
* An example announcement back-end, based on the broadcast primitive
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/announcement.h"
#include "net/rime/broadcast.h"
#include "lib/random.h"
#if NETSIM
#include "ether.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stddef.h>
struct announcement_data {
uint16_t id;
uint16_t value;
};
#ifdef BROADCAST_ANNOUNCEMENT_CONF_MAX_DUPS
#define NUM_DUPS BROADCAST_ANNOUNCEMENT_CONF_MAX_DUPS
#else /* BROADCAST_ANNOUNCEMENT_CONF_MAX_DUPS */
#define NUM_DUPS 5
#endif /* BROADCAST_ANNOUNCEMENT_CONF_MAX_DUPS */
#define ANNOUNCEMENT_MSG_HEADERLEN 2
struct announcement_msg {
uint16_t num;
struct announcement_data data[];
};
struct broadcast_announcement_state {
struct broadcast_conn c;
struct ctimer send_timer, interval_timer;
clock_time_t initial_interval, min_interval, max_interval;
clock_time_t current_interval;
uint16_t val;
} c;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define MIN(a, b) ((a)<(b)?(a):(b))
/*---------------------------------------------------------------------------*/
static void
send_adv(void *ptr)
{
struct announcement_msg *adata;
struct announcement *a;
packetbuf_clear();
adata = packetbuf_dataptr();
adata->num = 0;
for(a = announcement_list(); a != NULL; a = a->next) {
adata->data[adata->num].id = a->id;
adata->data[adata->num].value = a->value;
adata->num++;
}
packetbuf_set_datalen(ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata->num);
PRINTF("%d.%d: sending neighbor advertisement with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1], adata->num);
if(adata->num > 0) {
/* Send the packet only if it contains more than zero announcements. */
broadcast_send(&c.c);
}
PRINTF("%d.%d: sending neighbor advertisement with val %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
c.val);
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_received(struct broadcast_conn *ibc, const rimeaddr_t *from)
{
struct announcement_msg adata;
int i;
/* Copy number of announcements */
memcpy(&adata, packetbuf_dataptr(), sizeof(struct announcement_msg));
PRINTF("%d.%d: adv_packet_received from %d.%d with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1], adata.num);
for(i = 0; i < adata.num; ++i) {
struct announcement_data data;
/* Copy announcements */
memcpy(&data.id, &((struct announcement_msg *)packetbuf_dataptr())->data[i].id,
sizeof(uint16_t));
memcpy(&data.value, &((struct announcement_msg *)packetbuf_dataptr())->data[i].value,
sizeof(uint16_t));
announcement_heard(from,
data.id,
data.value);
}
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_sent(struct broadcast_conn *bc, int status, int num_tx)
{
}
/*---------------------------------------------------------------------------*/
static void send_timer(void *ptr);
static void
set_timers(void)
{
ctimer_set(&c.interval_timer, c.current_interval, send_timer, NULL);
ctimer_set(&c.send_timer, c.current_interval / 2 + random_rand() %
(c.current_interval / 2),
send_adv, NULL);
}
/*---------------------------------------------------------------------------*/
static void
send_timer(void *ptr)
{
clock_time_t interval;
interval = c.current_interval * 2;
if(interval > c.max_interval) {
interval = c.max_interval;
}
c.current_interval = interval;
/* printf("current_interval %lu\n", (long unsigned int) interval);*/
set_timers();
}
/*---------------------------------------------------------------------------*/
static void
new_announcement(uint16_t id, uint16_t newval, uint16_t oldval, uint8_t bump)
{
if(bump == ANNOUNCEMENT_BUMP) {
c.current_interval = c.initial_interval;
set_timers();
} else if(newval != oldval) {
c.current_interval = c.min_interval;
set_timers();
}
}
/*---------------------------------------------------------------------------*/
static CC_CONST_FUNCTION struct broadcast_callbacks broadcast_callbacks =
{adv_packet_received, adv_packet_sent };
/*---------------------------------------------------------------------------*/
void
broadcast_announcement_init(uint16_t channel,
clock_time_t initial,
clock_time_t min,
clock_time_t max)
{
broadcast_open(&c.c, channel, &broadcast_callbacks);
c.initial_interval = initial;
c.min_interval = min;
c.max_interval = max;
announcement_register_observer_callback(new_announcement);
}
/*---------------------------------------------------------------------------*/
void
broadcast_announcement_stop(void)
{
ctimer_stop(&c.interval_timer);
ctimer_stop(&c.send_timer);
broadcast_close(&c.c);
}
/*---------------------------------------------------------------------------*/
/** @} */

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core/net/rime/broadcast-announcement.h Normal file
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/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimebroadcastannouncement
* @{
*
* The broadcast announcement module implements a periodic explicit
* announcement. THe module announces the announcements that have been
* registered with the \ref rimeannouncement "announcement module".
*
* \section channels Channels
*
* The broadcast announcement module uses 1 channel.
*
*/
/*
* 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: broadcast-announcement.h,v 1.1 2010/03/19 13:15:19 adamdunkels Exp $
*/
/**
* \file
* Neighbor discovery header file
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __BROADCAST_ANNOUNCEMENT_H__
#define __BROADCAST_ANNOUNCEMENT_H__
void broadcast_announcement_init(uint16_t channel,
clock_time_t bump_time,
clock_time_t min_time,
clock_time_t max_time);
#endif /* __BROADCAST_ANNOUNCEMENT_H__ */
/** @} */
/** @} */