如何将数据形式保存到文本文件的新模块？

我正在尝试将现有的模块修改为
1) 添加更多字段而不是标准的 wifi 名称和密码字段
2) 保存给文本文件的答案
我知道如何修改 html 文件，但我不熟悉 C，所以我可以不明白如何将接收到的数据传递给 Lua 或将其直接保存到文本文件（考虑到它可能包含 utf-8 数据）。
在此感谢您的帮助。
代码：全选
...
   else if (c_strncmp(data + 4, "/setwifi?", 9) == 0)
    {
      switch (enduser_setup_http_handle_credentials(data, data_len))
      {
        case 0:
          enduser_setup_serve_status_as_json(http_client);
          break;
        case 1:
          enduser_setup_http_serve_header(http_client, http_header_400, LITLEN(http_header_400));
          break;
        default:
          ENDUSER_SETUP_ERROR("http_recvcb failed. Failed to handle wifi credentials.", ENDUSER_SETUP_ERR_UNKOWN_ERROR, ENDUSER_SETUP_ERR_NONFATAL);
          break;
      }
    }
...

static int enduser_setup_http_handle_credentials(char *data, unsigned short data_len)
{
  ENDUSER_SETUP_DEBUG("enduser_setup_http_handle_credentials");

  state->success = 0;
  state->lastStationStatus = 0;

  char *name_str = (char *) ((uint32_t)strstr(&(data[6]), "wifi_ssid="));
  char *pwd_str = (char *) ((uint32_t)strstr(&(data[6]), "wifi_password="));
  if (name_str == NULL || pwd_str == NULL)
  {
    ENDUSER_SETUP_DEBUG("Password or SSID string not found");
    return 1;
  }

  int name_field_len = LITLEN("wifi_ssid=");
  int pwd_field_len = LITLEN("wifi_password=");
  char *name_str_start = name_str + name_field_len;
  char *pwd_str_start = pwd_str + pwd_field_len;

  int name_str_len = enduser_setup_srch_str(name_str_start, "& ");
  int pwd_str_len = enduser_setup_srch_str(pwd_str_start, "& ");
  if (name_str_len == -1 || pwd_str_len == -1)
  {
    ENDUSER_SETUP_DEBUG("Password or SSID HTTP paramter divider not found");
    return 1;
  }


  struct station_config *cnf = luaM_malloc(lua_getstate(), sizeof(struct station_config));
  c_memset(cnf, 0, sizeof(struct station_config));

  int err;
  err  = enduser_setup_http_urldecode(cnf->ssid, name_str_start, name_str_len, sizeof(cnf->ssid));
  err |= enduser_setup_http_urldecode(cnf->password, pwd_str_start, pwd_str_len, sizeof(cnf->password));
  if (err != 0 || c_strlen(cnf->ssid) == 0)
  {
    ENDUSER_SETUP_DEBUG("Unable to decode HTTP parameter to valid password or SSID");
    return 1;
  }


  ENDUSER_SETUP_DEBUG("");
  ENDUSER_SETUP_DEBUG("WiFi Credentials Stored");
  ENDUSER_SETUP_DEBUG("-----------------------");
  ENDUSER_SETUP_DEBUG("name: ");
  ENDUSER_SETUP_DEBUG(cnf->ssid);
  ENDUSER_SETUP_DEBUG("pass: ");
  ENDUSER_SETUP_DEBUG(cnf->password);
  ENDUSER_SETUP_DEBUG("-----------------------");
  ENDUSER_SETUP_DEBUG("");

  task_post_medium(do_station_cfg_handle, (task_param_t) cnf);

  return 0;
}