nes-proj/examples/multicast/root.c

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/*
* Copyright (c) 2010, Loughborough University - 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
* This node is part of the RPL multicast example. It is an RPL root
* and sends a multicast message periodically. For the example to work,
* we need one of those nodes.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "contiki.h"
#include "contiki-lib.h"
#include "contiki-net.h"
#include "net/ipv6/multicast/uip-mcast6.h"
#include <string.h>
#define DEBUG DEBUG_PRINT
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#include "net/ipv6/uip-debug.h"
#include "rpl.h"
#include "rpl-dag-root.h"
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#define MAX_PAYLOAD_LEN 120
#define MCAST_SINK_UDP_PORT 3001 /* Host byte order */
#define SEND_INTERVAL CLOCK_SECOND /* clock ticks */
#define ITERATIONS 100 /* messages */
/* Start sending messages START_DELAY secs after we start so that routing can
* converge */
#define START_DELAY 60
static struct uip_udp_conn * mcast_conn;
static char buf[MAX_PAYLOAD_LEN];
static uint32_t seq_id;
#if !NETSTACK_CONF_WITH_IPV6 || !UIP_CONF_ROUTER || !UIP_IPV6_MULTICAST || !UIP_CONF_IPV6_RPL
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#error "This example can not work with the current contiki configuration"
#error "Check the values of: NETSTACK_CONF_WITH_IPV6, UIP_CONF_ROUTER, UIP_CONF_IPV6_RPL"
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#endif
/*---------------------------------------------------------------------------*/
PROCESS(rpl_root_process, "RPL ROOT, Multicast Sender");
AUTOSTART_PROCESSES(&rpl_root_process);
/*---------------------------------------------------------------------------*/
static void
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multicast_send(void)
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{
uint32_t id;
id = uip_htonl(seq_id);
memset(buf, 0, MAX_PAYLOAD_LEN);
memcpy(buf, &id, sizeof(seq_id));
PRINTF("Send to: ");
PRINT6ADDR(&mcast_conn->ripaddr);
PRINTF(" Remote Port %u,", uip_ntohs(mcast_conn->rport));
PRINTF(" (msg=0x%08lx)", (unsigned long)uip_ntohl(*((uint32_t *)buf)));
PRINTF(" %lu bytes\n", (unsigned long)sizeof(id));
seq_id++;
uip_udp_packet_send(mcast_conn, buf, sizeof(id));
}
/*---------------------------------------------------------------------------*/
static void
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prepare_mcast(void)
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{
uip_ipaddr_t ipaddr;
/*
* IPHC will use stateless multicast compression for this destination
* (M=1, DAC=0), with 32 inline bits (1E 89 AB CD)
*/
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uip_ip6addr(&ipaddr, 0xFF1E,0,0,0,0,0,0x89,0xABCD);
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mcast_conn = udp_new(&ipaddr, UIP_HTONS(MCAST_SINK_UDP_PORT), NULL);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(rpl_root_process, ev, data)
{
static struct etimer et;
PROCESS_BEGIN();
PRINTF("Multicast Engine: '%s'\n", UIP_MCAST6.name);
rpl_dag_root_init_dag_immediately();
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prepare_mcast();
etimer_set(&et, START_DELAY * CLOCK_SECOND);
while(1) {
PROCESS_YIELD();
if(etimer_expired(&et)) {
if(seq_id == ITERATIONS) {
etimer_stop(&et);
} else {
multicast_send();
etimer_set(&et, SEND_INTERVAL);
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/