er-coap-example: add example for client-side CoAP observe
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Daniele Alessandrelli
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3 changed files with 386 additions and 0 deletions
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examples/er-rest-example/er-example-observe-client.c
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examples/er-rest-example/er-example-observe-client.c
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/*
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* Copyright (c) 2014, Daniele Alessandrelli.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* Erbium (Er) CoAP observe client example.
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* \author
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* Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "contiki.h"
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#include "contiki-net.h"
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#include "er-coap-engine.h"
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#include "dev/button-sensor.h"
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/*----------------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINTFLN(format, ...) printf(format "\n", ##__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:" \
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"%02x%02x:%02x%02x:%02x%02x:%02x%02x]", \
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((uint8_t *)addr)[0], ((uint8_t *)addr)[1], \
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((uint8_t *)addr)[2], ((uint8_t *)addr)[3], \
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((uint8_t *)addr)[4], ((uint8_t *)addr)[5], \
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((uint8_t *)addr)[6], ((uint8_t *)addr)[7], \
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((uint8_t *)addr)[8], ((uint8_t *)addr)[9], \
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((uint8_t *)addr)[10], ((uint8_t *)addr)[11], \
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((uint8_t *)addr)[12], ((uint8_t *)addr)[13], \
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((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTFLN(...)
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#endif
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/*----------------------------------------------------------------------------*/
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/* FIXME: This server address is hard-coded for Cooja */
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#define SERVER_NODE(ipaddr) uip_ip6addr(ipaddr, 0xfe80, 0, 0, 0, 0x0212, \
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0x7402, 0x0002, 0x0202)
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#define REMOTE_PORT UIP_HTONS(COAP_DEFAULT_PORT)
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/* Toggle interval in seconds */
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#define TOGGLE_INTERVAL 30
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/* The path of the resource to observe */
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#define OBS_RESOURCE_URI "test/push"
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/*----------------------------------------------------------------------------*/
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static uip_ipaddr_t server_ipaddr[1]; /* holds the server ip address */
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static coap_observee_t *obs;
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/*----------------------------------------------------------------------------*/
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PROCESS(er_example_observe_client, "Erbium Coap Observe Client Example");
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AUTOSTART_PROCESSES(&er_example_observe_client);
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/*----------------------------------------------------------------------------*/
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/*
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* Handle the response to the observe request and the following notifications
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*/
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static void
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notification_callback(coap_observee_t *obs, void *notification,
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coap_notification_flag_t flag)
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{
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int len = 0;
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const uint8_t *payload = NULL;
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printf("Notification handler\n");
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printf("Observee URI: %s\n", obs->url);
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if(notification) {
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len = coap_get_payload(notification, &payload);
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}
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switch(flag) {
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case NOTIFICATION_OK:
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printf("NOTIFICATION OK: %*s\n", len, (char *)payload);
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break;
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case OBSERVE_OK: /* server accepeted observation request */
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printf("OBSERVE_OK: %*s\n", len, (char *)payload);
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break;
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case OBSERVE_NOT_SUPPORTED:
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printf("OBSERVE_NOT_SUPPORTED: %*s\n", len, (char *)payload);
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obs = NULL;
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break;
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case ERROR_RESPONSE_CODE:
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printf("ERROR_RESPONSE_CODE: %*s\n", len, (char *)payload);
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obs = NULL;
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break;
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case NO_REPLY_FROM_SERVER:
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printf("NO_REPLY_FROM_SERVER: "
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"removing observe registration with token %x%x\n",
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obs->token[0], obs->token[1]);
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obs = NULL;
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break;
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}
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}
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/*----------------------------------------------------------------------------*/
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/*
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* Toggle the observation of the remote resource
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*/
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void
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toggle_observation(void)
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{
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if(obs) {
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printf("Stopping observation\n");
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coap_obs_remove_observee(obs);
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obs = NULL;
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} else {
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printf("Starting observation\n");
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obs = coap_obs_request_registration(server_ipaddr, REMOTE_PORT,
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OBS_RESOURCE_URI, notification_callback, NULL);
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}
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}
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/*----------------------------------------------------------------------------*/
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/*
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* The main (proto-)thread. It starts/stops the observation of the remote
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* resource every time the timer elapses or the button (if available) is
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* pressed
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*/
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PROCESS_THREAD(er_example_observe_client, ev, data)
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{
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PROCESS_BEGIN();
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static struct etimer et;
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/* store server address in server_ipaddr */
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SERVER_NODE(server_ipaddr);
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/* receives all CoAP messages */
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coap_init_engine();
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/* init timer and button (if available) */
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etimer_set(&et, TOGGLE_INTERVAL * CLOCK_SECOND);
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#if PLATFORM_HAS_BUTTON
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SENSORS_ACTIVATE(button_sensor);
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printf("Press a button to start/stop observation of remote resource\n");
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#endif
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/* toggle observation every time the timer elapses or the button is pressed */
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while(1) {
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PROCESS_YIELD();
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if(etimer_expired(&et)) {
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printf("--Toggle timer--\n");
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toggle_observation();
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printf("\n--Done--\n");
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etimer_reset(&et);
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#if PLATFORM_HAS_BUTTON
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} else if(ev == sensors_event && data == &button_sensor) {
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printf("--Toggle tutton--\n");
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toggle_observation();
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printf("\n--Done--\n");
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#endif
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}
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}
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PROCESS_END();
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}
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