nes-proj/examples/websockets/websocket-example.c

/*
 * Copyright (c) 2012, Thingsquare, http://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 copyright holder 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDER 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 "websocket.h"

#include <stdio.h>

static struct websocket s;

static void callback(struct websocket *s, websocket_result_t r,
                     const uint8_t *data, uint16_t datalen);

#define RECONNECT_INTERVAL 10 * CLOCK_SECOND
static struct ctimer reconnect_timer;

/*---------------------------------------------------------------------------*/
PROCESS(websocket_example_process, "Websocket Example");
AUTOSTART_PROCESSES(&websocket_example_process);
/*---------------------------------------------------------------------------*/
static void
reconnect_callback(void *ptr)
{
  websocket_open(&s, "ws://172.16.0.1:8080/",
                 "contiki", NULL, callback);
}
/*---------------------------------------------------------------------------*/
static void
callback(struct websocket *s, websocket_result_t r,
         const uint8_t *data, uint16_t datalen)
{
  if(r == WEBSOCKET_CLOSED ||
     r == WEBSOCKET_RESET ||
     r == WEBSOCKET_HOSTNAME_NOT_FOUND ||
     r == WEBSOCKET_TIMEDOUT) {
    ctimer_set(&reconnect_timer, RECONNECT_INTERVAL, reconnect_callback, s);
  } else if(r == WEBSOCKET_CONNECTED) {
    websocket_send_str(s, "Connected");
  } else if(r == WEBSOCKET_DATA) {
    printf("websocket-example: Received data '%.*s' (len %d)\n", datalen,
           data, datalen);
  }
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(websocket_example_process, ev, data)
{
  static struct etimer et;
  PROCESS_BEGIN();

  ctimer_set(&reconnect_timer, RECONNECT_INTERVAL, reconnect_callback, &s);

  websocket_init(&s);
  while(1) {
    etimer_set(&et, CLOCK_SECOND / 8);
    PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
    char buf[] = "012345678";
    static int count;
    buf[0] = (count % 9) + '0';
    count++;
    websocket_send_str(&s, buf);
  }

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