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#include "esp_http_client.h"
#include "esp_sleep.h"
#include "lwip/netdb.h"
#include "wifi.h"
#include <ds18x20.h>
#include <stdio.h>
#define ST(A) #A
#define STR(A) ST(A)
#ifndef MAX_SENSOR_COUNT
#define MAX_SENSOR_COUNT 10
#endif
#ifndef TEMPERATURE_SENSOR_PIN
#define TEMPERATURE_SENSOR_PIN GPIO_NUM_17
#endif
static float temps[MAX_SENSOR_COUNT];
esp_err_t _http_event_handler(esp_http_client_event_t *evt) { return ESP_OK; }
void app_main() {
const int wakeup_time_sec = 900;
const wifi_sta_config_t wifi_config = {
.ssid = STR(WIFI_SSID),
.password = STR(WIFI_PASS),
};
ds18x20_addr_t addrs[MAX_SENSOR_COUNT];
size_t sensor_count = 0;
gpio_config_t io_conf = {};
io_conf.pin_bit_mask = (1ULL << TEMPERATURE_SENSOR_PIN);
io_conf.mode = GPIO_MODE_INPUT;
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
gpio_config(&io_conf);
ESP_ERROR_CHECK(ds18x20_scan_devices(TEMPERATURE_SENSOR_PIN, addrs,
MAX_SENSOR_COUNT, &sensor_count));
printf("Found %d sensors\n", sensor_count);
ESP_ERROR_CHECK(wifi_init(&wifi_config));
esp_http_client_config_t config = {
.host = STR(PUSH_GATEWAY_HOST),
.port = PUSH_GATEWAY_PORT,
.path = "/metrics/job/ds1820",
.transport_type = HTTP_TRANSPORT_OVER_TCP,
.event_handler = _http_event_handler,
};
esp_http_client_handle_t client = esp_http_client_init(&config);
ds18x20_measure_and_read_multi(TEMPERATURE_SENSOR_PIN, addrs, sensor_count,
temps);
for (int i = 0; i < sensor_count; i++) {
char *post_data;
char *url;
if (0 > asprintf(&post_data,
"# TYPE ds1820_sensor "
"gauge\nds1820_sensor %f\n",
temps[i])) {
free(post_data);
goto sleep;
}
if (0 > asprintf(&url, "/metrics/job/ds1820/addr/%08x", (uint32_t)addrs[i])) {
free(post_data);
free(url);
goto sleep;
}
printf("Sensor: %08x - %fC\n", (uint32_t)addrs[i], temps[i]);
esp_http_client_set_url(client, url);
esp_http_client_set_method(client, HTTP_METHOD_POST);
esp_http_client_set_post_field(client, post_data, strlen(post_data));
esp_http_client_perform(client);
free(post_data);
free(url);
}
sleep:
esp_http_client_cleanup(client);
_wifi_deinit();
esp_sleep_enable_timer_wakeup(wakeup_time_sec * 1000000);
esp_deep_sleep_start();
}
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