Load credentials and settings from config file

include/config.h

@@ -0,0 +1,24 @@
+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+#include "FS.h"
+#include "LittleFS.h"
+
+struct Config {
+  const char *ssid;
+  const char *psk;
+  const char *mqtt_host;
+  const char *mqtt_user;
+  const char *mqtt_password;
+  int mqtt_port;
+  const char *topic;
+  const char *device_id;
+  long sleep_time;
+  int connection_attempts;
+};
+
+bool load_config_file(const char *file_path, struct Config &config);
+
+long minutes_to_microseconds(int minutes);
+
+#endif // CONFIG_H_