Allocate necessary memory for struct members

include/config.h

@@ -3,21 +3,24 @@
 
 #include "FS.h"
 #include "LittleFS.h"
+#include <ArduinoJson.h>
 
-struct Config {
+typedef struct {
   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;
+  int mqtt_port;
   long sleep_time;
   int connection_attempts;
-};
+} Config;
 
-bool load_config_file(const char *file_path, struct Config &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);