samples/net/lwm2m_client/src/temperature.c

/*
 * Copyright (c) 2022 Nordic Semiconductor
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define LOG_MODULE_NAME app_temp
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(LOG_MODULE_NAME);

#include "modules.h"

#include <zephyr/drivers/hwinfo.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/net/lwm2m.h>
#include <zephyr/kernel.h>
#include <zephyr/random/rand32.h>
#include <stdint.h>

static struct k_work_delayable temp_work;
#define PERIOD K_MINUTES(2)

static void temp_work_cb(struct k_work *work)
{
	double v;

	if (IS_ENABLED(CONFIG_FXOS8700_TEMP)) {
		const struct device *dev = device_get_binding("nxp_fxos8700");
		struct sensor_value val;

		if (!dev) {
			LOG_ERR("device not ready.");
			goto out;
		}
		if (sensor_sample_fetch(dev)) {
			LOG_ERR("temperature data update failed");
			goto out;
		}

		sensor_channel_get(dev, SENSOR_CHAN_DIE_TEMP, &val);

		v = sensor_value_to_double(&val);
	} else {
		/* Generate dummy temperature data */
		v = 20.0 + (double)sys_rand32_get() / UINT32_MAX * 5.0;
	}

	lwm2m_engine_set_float("3303/0/5700", &v);

out:
	k_work_schedule(&temp_work, PERIOD);
}

void init_temp_sensor(void)
{
	if (lwm2m_engine_create_obj_inst("3303/0") == 0) {
		k_work_init_delayable(&temp_work, temp_work_cb);
		k_work_schedule(&temp_work, K_NO_WAIT);
	}
}