/*
 * 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.
 *
 *
 * -----------------------------------------------------------------
 *
 * Author  : Adam Dunkels, Joakim Eriksson, Niclas Finne
 * Created : 2006-03-07
 * Updated : $Date: 2010/10/19 18:29:05 $
 *           $Revision: 1.3 $
 *
 * Simple application to indicate connectivity between two nodes:
 *
 * - Red led indicates a packet sent via radio (one packet sent each second)
 * - Yellow led indicates that this node can hear the other node but not
 *   necessary vice versa (unidirectional communication).
 * - Green led indicates that both nodes can communicate with each
 *   other (bidirectional communication)
 */

#include "contiki-esb.h"
#include <string.h>

PROCESS(radio_test_process, "Radio test");
AUTOSTART_PROCESSES(&radio_test_process);

#define ON  1
#define OFF 0

#define HEADER "RTST"
#define PACKET_SIZE 20
#define PORT 2345

struct indicator {
  int onoff;
  int led;
  clock_time_t interval;
  struct etimer timer;
};

/*---------------------------------------------------------------------*/
static void
set(struct indicator *indicator, int onoff) {
  if(indicator->onoff ^ onoff) {
    indicator->onoff = onoff;
    if(onoff) {
      leds_on(indicator->led);
    } else {
      leds_off(indicator->led);
    }
  }
  if(onoff) {
    etimer_set(&indicator->timer, indicator->interval);
  }
}
/*---------------------------------------------------------------------*/
PROCESS_THREAD(radio_test_process, ev, data)
{
  static struct etimer send_timer;
  static struct uip_udp_conn *conn;
  static struct indicator recv, other, flash;

  PROCESS_BEGIN();

  /* Initialize the indicators */
  recv.onoff = other.onoff = flash.onoff = OFF;
  recv.interval = other.interval = CLOCK_SECOND;
  flash.interval = 1;
  recv.led = LEDS_YELLOW;
  other.led = LEDS_GREEN;
  flash.led = LEDS_RED;

  conn = udp_broadcast_new(UIP_HTONS(PORT), NULL);
  etimer_set(&send_timer, CLOCK_SECOND);

  while(1) {
    PROCESS_WAIT_EVENT();

    if(ev == PROCESS_EVENT_TIMER) {
      if(data == &send_timer) {
	etimer_reset(&send_timer);
	tcpip_poll_udp(conn);

      } else if(data == &other.timer) {
	set(&other, OFF);

      } else if(data == &recv.timer) {
	set(&recv, OFF);

      } else if(data == &flash.timer) {
	set(&flash, OFF);
      }

    } else if(ev == tcpip_event) {

      if(uip_poll()) {
	/* send packet */
	memcpy(uip_appdata, HEADER, sizeof(HEADER));
	((char *)uip_appdata)[sizeof(HEADER)] = recv.onoff;
	/* send arbitrary data to fill the packet size */
	uip_send(uip_appdata, PACKET_SIZE);

	set(&flash, ON);
      }

      if(uip_newdata()) {
	/* packet received */
	if(uip_datalen() < PACKET_SIZE
	   || strncmp((char *)uip_appdata, HEADER, sizeof(HEADER))) {
	  /* invalid message */
	  leds_blink();

	} else {
	  set(&recv, ON);
	  set(&other, ((char *)uip_appdata)[sizeof(HEADER)] ? ON : OFF);

	  /* synchronize the sending to keep the nodes from sending
	     simultaneously */
	  etimer_set(&send_timer, CLOCK_SECOND);
	  etimer_adjust(&send_timer, - (int) (CLOCK_SECOND >> 1));

	  beep();
	}
      }
    }
  }
  PROCESS_END();
}
/*---------------------------------------------------------------------*/