// WiFiManager & Autoconfig
//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
}

void setupSpiffs() {
  //clean FS, for testing
  //SPIFFS.format();

  //read configuration from FS json
  debugln("mounting FS...");

  if (SPIFFS.begin()) {
    debugln("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      debugln("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        debugln("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          debugln("\nparsed json");

          strcpy(idx_windir,      json["idx_windir"]);
          strcpy(idx_temp,        json["idx_temp"]);
          strcpy(idx_rain,        json["idex_rain"]);
        } else {
          Serial.println("failed to load json config");
        }
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
}