nes-proj/examples/coap/coap-example-observe-client.c

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/*
* Copyright (c) 2014, Daniele Alessandrelli.
* 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 observe client example.
* \author
* Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "contiki-net.h"
#include "coap-engine.h"
#include "dev/button-sensor.h"
/*----------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINTFLN(format, ...) printf(format "\n", ##__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])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTFLN(...)
#endif
/*----------------------------------------------------------------------------*/
/* FIXME: This server address is hard-coded for Cooja */
#define SERVER_NODE(ipaddr) uip_ip6addr(ipaddr, 0xfe80, 0, 0, 0, 0x0212, \
0x7402, 0x0002, 0x0202)
#define REMOTE_PORT UIP_HTONS(COAP_DEFAULT_PORT)
/* Toggle interval in seconds */
#define TOGGLE_INTERVAL 30
/* The path of the resource to observe */
#define OBS_RESOURCE_URI "test/push"
/*----------------------------------------------------------------------------*/
static uip_ipaddr_t server_ipaddr[1]; /* holds the server ip address */
static coap_observee_t *obs;
/*----------------------------------------------------------------------------*/
PROCESS(er_example_observe_client, "Erbium Coap Observe Client Example");
AUTOSTART_PROCESSES(&er_example_observe_client);
/*----------------------------------------------------------------------------*/
/*
* Handle the response to the observe request and the following notifications
*/
static void
notification_callback(coap_observee_t *obs, void *notification,
coap_notification_flag_t flag)
{
int len = 0;
const uint8_t *payload = NULL;
printf("Notification handler\n");
printf("Observee URI: %s\n", obs->url);
if(notification) {
len = coap_get_payload(notification, &payload);
}
switch(flag) {
case NOTIFICATION_OK:
printf("NOTIFICATION OK: %*s\n", len, (char *)payload);
break;
case OBSERVE_OK: /* server accepeted observation request */
printf("OBSERVE_OK: %*s\n", len, (char *)payload);
break;
case OBSERVE_NOT_SUPPORTED:
printf("OBSERVE_NOT_SUPPORTED: %*s\n", len, (char *)payload);
obs = NULL;
break;
case ERROR_RESPONSE_CODE:
printf("ERROR_RESPONSE_CODE: %*s\n", len, (char *)payload);
obs = NULL;
break;
case NO_REPLY_FROM_SERVER:
printf("NO_REPLY_FROM_SERVER: "
"removing observe registration with token %x%x\n",
obs->token[0], obs->token[1]);
obs = NULL;
break;
}
}
/*----------------------------------------------------------------------------*/
/*
* Toggle the observation of the remote resource
*/
void
toggle_observation(void)
{
if(obs) {
printf("Stopping observation\n");
coap_obs_remove_observee(obs);
obs = NULL;
} else {
printf("Starting observation\n");
obs = coap_obs_request_registration(server_ipaddr, REMOTE_PORT,
OBS_RESOURCE_URI, notification_callback, NULL);
}
}
/*----------------------------------------------------------------------------*/
/*
* The main (proto-)thread. It starts/stops the observation of the remote
* resource every time the timer elapses or the button (if available) is
* pressed
*/
PROCESS_THREAD(er_example_observe_client, ev, data)
{
PROCESS_BEGIN();
static struct etimer et;
/* store server address in server_ipaddr */
SERVER_NODE(server_ipaddr);
/* receives all CoAP messages */
coap_init_engine();
/* init timer and button (if available) */
etimer_set(&et, TOGGLE_INTERVAL * CLOCK_SECOND);
#if PLATFORM_HAS_BUTTON
SENSORS_ACTIVATE(button_sensor);
printf("Press a button to start/stop observation of remote resource\n");
#endif
/* toggle observation every time the timer elapses or the button is pressed */
while(1) {
PROCESS_YIELD();
if(etimer_expired(&et)) {
printf("--Toggle timer--\n");
toggle_observation();
printf("\n--Done--\n");
etimer_reset(&et);
#if PLATFORM_HAS_BUTTON
} else if(ev == sensors_event && data == &button_sensor) {
printf("--Toggle tutton--\n");
toggle_observation();
printf("\n--Done--\n");
#endif
}
}
PROCESS_END();
}