From 1fd97b74dce8318d9d0d7367896dbe3b21823d65 Mon Sep 17 00:00:00 2001
From: Christian Segundo
Date: Tue, 4 Apr 2023 18:33:04 +0200
Subject: first commit

---
 src/main.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/main.c

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..4908709
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,92 @@
+#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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