text: /*
   * Copyright (c) 2011, Matthias Kovatsch and other contributors.
   * 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
   *      Erbium (Er) CoAP client example
   * \author
   *      Matthias Kovatsch <kovatsch@inf.ethz.ch>
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "contiki.h"
  #include "contiki-net.h"
  
  #if !UIP_CONF_IPV6_RPL && !defined (CONTIKI_TARGET_MINIMAL_NET) && !defined (CONTIKI_TARGET_NATIVE)
  #warning "Compiling with static routing!"
  #include "static-routing.h"
  #endif
  
  #include "dev/button-sensor.h"
  
  #if WITH_COAP == 3
  #include "er-coap-03-engine.h"
  #elif WITH_COAP == 6
  #include "er-coap-06-engine.h"
  #elif WITH_COAP == 7
  #include "er-coap-07-engine.h"
  #else
  #error "CoAP version defined by WITH_COAP not implemented"
  #endif
  
  
  #define DEBUG 0
  #if DEBUG
  #define PRINTF(...) printf(__VA_ARGS__)
  #define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
  #define PRINTLLADDR(lladdr) PRINTF("[%02x:%02x:%02x:%02x:%02x:%02x]",(lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3],(lladdr)->addr[4], (lladdr)->addr[5])
  #else
  #define PRINTF(...)
  #define PRINT6ADDR(addr)
  #define PRINTLLADDR(addr)
  #endif
  
  /* TODO: This server address is hard-coded for Cooja. */
  #define SERVER_NODE(ipaddr)   uip_ip6addr(ipaddr, 0xaaaa, 0, 0, 0, 0x0212, 0x7402, 0x0002, 0x0202) /* cooja2 */
  
  #define LOCAL_PORT      UIP_HTONS(COAP_DEFAULT_PORT+1)
  #define REMOTE_PORT     UIP_HTONS(COAP_DEFAULT_PORT)
  
  #define TOGGLE_INTERVAL 10
  
  PROCESS(coap_client_example, "COAP Client Example");
  AUTOSTART_PROCESSES(&coap_client_example);
  
  
  uip_ipaddr_t server_ipaddr;
  static struct etimer et;
  
  /* Example URIs that can be queried. */
  #define NUMBER_OF_URLS 4
  /* leading and ending slashes only for demo purposes, get cropped automatically when setting the Uri-Path */
  char* service_urls[NUMBER_OF_URLS] = {".well-known/core", "/actuators/toggle", "battery/", "error/in//path"};
  #if PLATFORM_HAS_BUTTON
  static int uri_switch = 0;
  #endif
  
  /* This function is will be passed to COAP_BLOCKING_REQUEST() to handle responses. */
  void
  client_chunk_handler(void *response)
  {
    uint8_t *chunk;
  
    int len = coap_get_payload(response, &chunk);
    printf("|%.*s", len, (char *)chunk);
  }
  
  
  PROCESS_THREAD(coap_client_example, ev, data)
  {
    PROCESS_BEGIN();
  
    static coap_packet_t request[1]; /* This way the packet can be treated as pointer as usual. */
    SERVER_NODE(&server_ipaddr);
  
    /* receives all CoAP messages */
    coap_receiver_init();
  
    etimer_set(&et, TOGGLE_INTERVAL * CLOCK_SECOND);
  
  #if PLATFORM_HAS_BUTTON
    SENSORS_ACTIVATE(button_sensor);
    printf("Press a button to request %s\n", service_urls[uri_switch]);
  #endif
  
    while(1) {
      PROCESS_YIELD();
  
      if (etimer_expired(&et)) {
        printf("--Toggle timer--\n");
  
        /* prepare request, TID is set by COAP_BLOCKING_REQUEST() */
        coap_init_message(request, COAP_TYPE_CON, COAP_POST, 0 );
        coap_set_header_uri_path(request, service_urls[1]);
  
        const char msg[] = "Toggle!";
        coap_set_payload(request, (uint8_t *)msg, sizeof(msg)-1);
  
  
        PRINT6ADDR(&server_ipaddr);
        PRINTF(" : %u\n", UIP_HTONS(REMOTE_PORT));
  
        COAP_BLOCKING_REQUEST(&server_ipaddr, REMOTE_PORT, request, client_chunk_handler);
  
        printf("\n--Done--\n");
  
        etimer_reset(&et);
  
  #if PLATFORM_HAS_BUTTON
      } else if (ev == sensors_event && data == &button_sensor) {
  
        /* send a request to notify the end of the process */
  
        coap_init_message(request, COAP_TYPE_CON, COAP_GET, 0);
        coap_set_header_uri_path(request, service_urls[uri_switch]);
  
        printf("--Requesting %s--\n", service_urls[uri_switch]);
  
        PRINT6ADDR(&server_ipaddr);
        PRINTF(" : %u\n", UIP_HTONS(REMOTE_PORT));
  
        COAP_BLOCKING_REQUEST(&server_ipaddr, REMOTE_PORT, request, client_chunk_handler);
  
        printf("\n--Done--\n");
  
        uri_switch = (uri_switch+1) % NUMBER_OF_URLS;
  #endif
  
      }
    }
  
    PROCESS_END();
  }
  