text: /*
   * Copyright (c) 2012, Thingsquare, www.thingsquare.com.
   * 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.
   */
  
  #include "contiki.h"
  #include "lib/random.h"
  #include "sys/ctimer.h"
  #include "sys/etimer.h"
  #include "net/ipv6/uip.h"
  #include "net/ipv6/uip-ds6.h"
  #include "net/ipv6/uip-ds6-route.h"
  #include "net/ipv6/uip-debug.h"
  
  #include "simple-udp.h"
  
  #include "rpl.h"
  #include "dev/leds.h"
  
  #include <stdio.h>
  #include <string.h>
  
  #define UDP_PORT 1234
  
  static struct simple_udp_connection unicast_connection;
  
  /*---------------------------------------------------------------------------*/
  PROCESS(receiver_node_process, "Receiver node");
  AUTOSTART_PROCESSES(&receiver_node_process);
  /*---------------------------------------------------------------------------*/
  static void
  receiver(struct simple_udp_connection *c,
           const uip_ipaddr_t *sender_addr,
           uint16_t sender_port,
           const uip_ipaddr_t *receiver_addr,
           uint16_t receiver_port,
           const uint8_t *data,
           uint16_t datalen)
  {
    printf("Data received from ");
    uip_debug_ipaddr_print(sender_addr);
    printf(" on port %d from port %d with length %d: '%s'\n",
           receiver_port, sender_port, datalen, data);
  }
  /*---------------------------------------------------------------------------*/
  static uip_ipaddr_t *
  set_global_address(void)
  {
    static uip_ipaddr_t ipaddr;
    int i;
    uint8_t state;
  
    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
    uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
    uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
  
    printf("IPv6 addresses: ");
    for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
      state = uip_ds6_if.addr_list[i].state;
      if(uip_ds6_if.addr_list[i].isused &&
         (state == ADDR_TENTATIVE || state == ADDR_PREFERRED)) {
        uip_debug_ipaddr_print(&uip_ds6_if.addr_list[i].ipaddr);
        printf("\n");
      }
    }
  
    return &ipaddr;
  }
  /*---------------------------------------------------------------------------*/
  PROCESS_THREAD(receiver_node_process, ev, data)
  {
    static struct etimer et;
  
    PROCESS_BEGIN();
  
    set_global_address();
  
    simple_udp_register(&unicast_connection, UDP_PORT,
                        NULL, UDP_PORT, receiver);
  
    etimer_set(&et, CLOCK_SECOND);
    while(1) {
      PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
      etimer_reset(&et);
    }
    PROCESS_END();
  }
  /*---------------------------------------------------------------------------*/
  