IPv6 Multicast Example
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George Oikonomou
George Oikonomou
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171
examples/ipv6/multicast/root.c
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171
examples/ipv6/multicast/root.c
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/*
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* Copyright (c) 2010, Loughborough University - Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* This node is part of the RPL multicast example. It is an RPL root
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* and sends a multicast message periodically. For the example to work,
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* we need one of those nodes.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "contiki.h"
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#include "contiki-lib.h"
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#include "contiki-net.h"
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#include "net/ipv6/multicast/uip-mcast6.h"
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#include <string.h>
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#define DEBUG DEBUG_PRINT
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#include "net/ip/uip-debug.h"
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#include "net/rpl/rpl.h"
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#define MAX_PAYLOAD_LEN 120
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#define MCAST_SINK_UDP_PORT 3001 /* Host byte order */
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#define SEND_INTERVAL CLOCK_SECOND /* clock ticks */
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#define ITERATIONS 100 /* messages */
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/* Start sending messages START_DELAY secs after we start so that routing can
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* converge */
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#define START_DELAY 60
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static struct uip_udp_conn * mcast_conn;
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static char buf[MAX_PAYLOAD_LEN];
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static uint32_t seq_id;
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#if !UIP_CONF_IPV6 || !UIP_CONF_ROUTER || !UIP_CONF_IPV6_MULTICAST || !UIP_CONF_IPV6_RPL
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#error "This example can not work with the current contiki configuration"
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#error "Check the values of: UIP_CONF_IPV6, UIP_CONF_ROUTER, UIP_CONF_IPV6_RPL"
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#endif
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/*---------------------------------------------------------------------------*/
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PROCESS(rpl_root_process, "RPL ROOT, Multicast Sender");
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AUTOSTART_PROCESSES(&rpl_root_process);
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/*---------------------------------------------------------------------------*/
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static void
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multicast_send()
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{
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uint32_t id;
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id = uip_htonl(seq_id);
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memset(buf, 0, MAX_PAYLOAD_LEN);
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memcpy(buf, &id, sizeof(seq_id));
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PRINTF("Send to: ");
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PRINT6ADDR(&mcast_conn->ripaddr);
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PRINTF(" Remote Port %u,", uip_ntohs(mcast_conn->rport));
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PRINTF(" (msg=0x%08lx)", (unsigned long)uip_ntohl(*((uint32_t *)buf)));
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PRINTF(" %lu bytes\n", (unsigned long)sizeof(id));
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seq_id++;
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uip_udp_packet_send(mcast_conn, buf, sizeof(id));
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}
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/*---------------------------------------------------------------------------*/
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static void
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prepare_mcast()
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{
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uip_ipaddr_t ipaddr;
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/*
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* IPHC will use stateless multicast compression for this destination
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* (M=1, DAC=0), with 32 inline bits (1E 89 AB CD)
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*/
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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);
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_own_addresses()
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{
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int i;
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uint8_t state;
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rpl_dag_t *dag;
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uip_ipaddr_t ipaddr;
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uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
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uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
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uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
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PRINTF("Our IPv6 addresses:\n");
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for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
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state = uip_ds6_if.addr_list[i].state;
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if(uip_ds6_if.addr_list[i].isused && (state == ADDR_TENTATIVE || state
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== ADDR_PREFERRED)) {
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PRINTF(" ");
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PRINT6ADDR(&uip_ds6_if.addr_list[i].ipaddr);
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PRINTF("\n");
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if (state == ADDR_TENTATIVE) {
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uip_ds6_if.addr_list[i].state = ADDR_PREFERRED;
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}
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}
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}
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/* Become root of a new DODAG with ID our global v6 address */
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dag = rpl_set_root(RPL_DEFAULT_INSTANCE, &ipaddr);
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if(dag != NULL) {
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rpl_set_prefix(dag, &ipaddr, 64);
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PRINTF("Created a new RPL dag with ID: ");
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PRINT6ADDR(&dag->dag_id);
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PRINTF("\n");
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(rpl_root_process, ev, data)
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{
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static struct etimer et;
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PROCESS_BEGIN();
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PRINTF("Multicast Engine: '%s'\n", UIP_MCAST6.name);
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NETSTACK_MAC.off(1);
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set_own_addresses();
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prepare_mcast();
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etimer_set(&et, START_DELAY * CLOCK_SECOND);
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while(1) {
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PROCESS_YIELD();
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if(etimer_expired(&et)) {
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if(seq_id == ITERATIONS) {
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etimer_stop(&et);
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} else {
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multicast_send();
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etimer_set(&et, SEND_INTERVAL);
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}
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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