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Implementation of OMA LWM2M Engine / IPSO Objects

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Niclas Finne 2015-12-01 04:14:46 +01:00
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commit 3dd11603a7
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apps/ipso-objects/ipso-temperature.c Normal file
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/*
* Copyright (c) 2015, Yanzi Networks AB.
* 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 copyright holder 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 COPYRIGHT HOLDER 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup ipso-objects
* @{
*/
/**
* \file
* Implementation of OMA LWM2M / IPSO Temperature
* \author
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include <stdint.h>
#include "ipso-objects.h"
#include "lwm2m-object.h"
#include "lwm2m-engine.h"
#include "er-coap-engine.h"
#ifdef IPSO_TEMPERATURE
extern const struct ipso_objects_sensor IPSO_TEMPERATURE;
#endif /* IPSO_TEMPERATURE */
#ifndef IPSO_TEMPERATURE_MIN
#define IPSO_TEMPERATURE_MIN (-50 * LWM2M_FLOAT32_FRAC)
#endif
#ifndef IPSO_TEMPERATURE_MAX
#define IPSO_TEMPERATURE_MAX (80 * LWM2M_FLOAT32_FRAC)
#endif
static struct ctimer periodic_timer;
static int32_t min_temp;
static int32_t max_temp;
static int read_temp(int32_t *value);
/*---------------------------------------------------------------------------*/
static int
temp(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outsize)
{
int32_t value;
if(read_temp(&value)) {
return ctx->writer->write_float32fix(ctx, outbuf, outsize,
value, LWM2M_FLOAT32_BITS);
}
return 0;
}
/*---------------------------------------------------------------------------*/
LWM2M_RESOURCES(temperature_resources,
/* Temperature (Current) */
LWM2M_RESOURCE_CALLBACK(5700, { temp, NULL, NULL }),
/* Units */
LWM2M_RESOURCE_STRING(5701, "Celcius"),
/* Min Range Value */
LWM2M_RESOURCE_FLOATFIX(5603, IPSO_TEMPERATURE_MIN),
/* Max Range Value */
LWM2M_RESOURCE_FLOATFIX(5604, IPSO_TEMPERATURE_MAX),
/* Min Measured Value */
LWM2M_RESOURCE_FLOATFIX_VAR(5601, &min_temp),
/* Max Measured Value */
LWM2M_RESOURCE_FLOATFIX_VAR(5602, &max_temp),
);
LWM2M_INSTANCES(temperature_instances,
LWM2M_INSTANCE(0, temperature_resources));
LWM2M_OBJECT(temperature, 3303, temperature_instances);
/*---------------------------------------------------------------------------*/
static int
read_temp(int32_t *value)
{
#ifdef IPSO_TEMPERATURE
int32_t temp;
if(IPSO_TEMPERATURE.read_value == NULL ||
IPSO_TEMPERATURE.read_value(&temp) != 0) {
return 0;
}
/* Convert milliCelsius to fix float */
*value = (temp * LWM2M_FLOAT32_FRAC) / 1000;
if(*value < min_temp) {
min_temp = *value;
lwm2m_object_notify_observers(&temperature, "/0/5601");
}
if(*value > max_temp) {
max_temp = *value;
lwm2m_object_notify_observers(&temperature, "/0/5602");
}
return 1;
#else /* IPSO_TEMPERATURE */
return 0;
#endif /* IPSO_TEMPERATURE */
}
/*---------------------------------------------------------------------------*/
static void
handle_periodic_timer(void *ptr)
{
static int32_t last_value = IPSO_TEMPERATURE_MIN;
int32_t v;
/* Only notify when the value has changed since last */
if(read_temp(&v) && v != last_value) {
last_value = v;
lwm2m_object_notify_observers(&temperature, "/0/5700");
}
ctimer_reset(&periodic_timer);
}
/*---------------------------------------------------------------------------*/
void
ipso_temperature_init(void)
{
int32_t v;
min_temp = IPSO_TEMPERATURE_MAX;
max_temp = IPSO_TEMPERATURE_MIN;
#ifdef IPSO_TEMPERATURE
if(IPSO_TEMPERATURE.init) {
IPSO_TEMPERATURE.init();
}
#endif /* IPSO_TEMPERATURE */
/* register this device and its handlers - the handlers automatically
sends in the object to handle */
lwm2m_engine_register_object(&temperature);
/* update temp and min/max + notify any listeners */
read_temp(&v);
ctimer_set(&periodic_timer, CLOCK_SECOND * 10, handle_periodic_timer, NULL);
}
/*---------------------------------------------------------------------------*/
/** @} */