96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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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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* Example resource
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "coap-engine.h"
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#include "coap.h"
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/* Log configuration */
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#include "sys/log.h"
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#define LOG_MODULE "App"
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#define LOG_LEVEL LOG_LEVEL_APP
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static void res_get_handler(coap_message_t *request, coap_message_t *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
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static void res_event_handler(void);
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/*
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* Example for an event resource.
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* Additionally takes a period parameter that defines the interval to call [name]_periodic_handler().
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* A default post_handler takes care of subscriptions and manages a list of subscribers to notify.
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*/
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EVENT_RESOURCE(res_event,
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"title=\"Event demo\";obs",
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res_get_handler,
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NULL,
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NULL,
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NULL,
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res_event_handler);
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/*
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* Use local resource state that is accessed by res_get_handler() and altered by res_event_handler() or PUT or POST.
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*/
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static int32_t event_counter = 0;
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static void
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res_get_handler(coap_message_t *request, coap_message_t *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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coap_set_header_content_format(response, TEXT_PLAIN);
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coap_set_payload(response, buffer, snprintf((char *)buffer, preferred_size, "EVENT %lu", (unsigned long) event_counter));
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/* A post_handler that handles subscriptions/observing will be called for periodic resources by the framework. */
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}
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/*
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* Additionally, res_event_handler must be implemented for each EVENT_RESOURCE.
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* It is called through <res_name>.trigger(), usually from the server process.
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*/
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static void
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res_event_handler(void)
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{
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/* Do the update triggered by the event here, e.g., sampling a sensor. */
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++event_counter;
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/* Usually a condition is defined under with subscribers are notified, e.g., event was above a threshold. */
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if(1) {
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LOG_DBG("TICK %u for /%s\n", (unsigned)event_counter, res_event.url);
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/* Notify the registered observers which will trigger the res_get_handler to create the response. */
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coap_notify_observers(&res_event);
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}
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}
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