osd-contiki/examples/osd/climate2/resources/res-dht11hum.c

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2014-11-27 09:30:36 +01:00
/*
* Copyright (c) 2014, OSDomotics, Institute of Technology.
* 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
* dht11hum Sensor Resource
*
* This is a simple GET resource that returns the humidity in % rel.
*
* \author
* Harald Pichler <harald@the-develop.net>
*/
#include "contiki.h"
#if PLATFORM_HAS_DHT11HUM
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
#include "rest-engine.h"
#include "dev/dht11.h"
/*A simple getter example. Returns the reading from dhtxx sensor*/
static void res_get_dht11hum_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
RESOURCE(res_dht11hum,
"title=\"Humidity DHTxx\";rt=\"humidity %\"",
res_get_dht11hum_handler,
NULL,
NULL,
NULL);
uint16_t dht11_hum=0;
static void
res_get_dht11hum_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
char message[100];
int length = 0; /* |<-------->| */
unsigned int accept = -1;
REST.get_header_accept(request, &accept);
if(accept == -1 || accept == REST.type.TEXT_PLAIN)
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
snprintf(message, REST_MAX_CHUNK_SIZE, "%d.%02d",dht11_hum/100, dht11_hum % 100);
length = strlen(message);
memcpy(buffer, message,length );
REST.set_response_payload(response, buffer, length);
}
else if (accept == REST.type.APPLICATION_JSON)
{
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
snprintf(message, REST_MAX_CHUNK_SIZE, "{\"hum\":\"%d.%02d\"}",dht11_hum/100, dht11_hum % 100);
length = strlen(message);
memcpy(buffer, message,length );
REST.set_response_payload(response, buffer, length);
}
else
{
REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
REST.set_response_payload(response, (uint8_t *)"Supporting content-types text/plain and application/json", 56);
}
}
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#endif /* PLATFORM_HAS_DHT11HUM */