Initial commit

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

include/config.h

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+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+#include "FS.h"
+#include "LittleFS.h"
+#include <ArduinoJson.h>
+
+typedef struct {
+  const char *ssid;
+  const char *psk;
+  const char *mqtt_host;
+  const char *mqtt_user;
+  const char *mqtt_password;
+  const char *topic;
+  const char *device_id;
+  int mqtt_port;
+  long sleep_time;
+  int connection_attempts;
+} Config;
+
+void initialize_config(Config *config, StaticJsonDocument<512> json);
+
+bool load_config_file(const char *file_path, Config *config);
+
+long minutes_to_microseconds(int minutes);
+
+#endif // CONFIG_H_

include/wlan.h

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+#ifndef WLAN_H
+#define WLAN_H
+
+#include "config.h"
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+void initial_connection(const char *ssid, const char *psk);
+void connect_wlan(Config *config);
+void connect_mqtt(PubSubClient &client, Config *config);
+void disconnect_mqtt(PubSubClient &client, const char *topic);
+size_t construct_json(float *data, char *buffer, int buffer_size);
+void mqtt_transfer(PubSubClient &client, Config *config, float *data);
+void enter_deep_sleep(bool wifi_timeout, int sleep_time);
+
+#endif /* WLAN_H */