HTTP file upload to SPIFFS

[davidchatting-bot]

From the README's Development section - filing as a tracked issue.

Current state

onYoYoRequestUPLOAD() and the multipart/form-data branch of onYoYoRequestPOST() (src/YoYoWiFiManager.cpp) both just acknowledge the request with a 200 and do nothing else - no file is actually written to SPIFFS/SD:

else if(request -> contentType().equals("multipart/form-data")) {
  //FILE UPLOAD
  request->send(200);
  result = 200;
}

int YoYoWiFiManager::onYoYoRequestUPLOAD(uint8_t *data, size_t len, AsyncWebServerRequest *request) {
  int result = 500;

  if (request->url().equals("/yoyo/upload")) {
    request->send(200);
    result = 200;
  }
  ...

So today there's no way to push new HTML/JS/media assets to a device over the network - the data folder has to be uploaded via the Arduino IDE's SPIFFS/SD uploader tool over USB.

Ask

Wire up onYoYoRequestUPLOAD() (AsyncWebServerRequest's multipart body-parsing callback gives you data/len/index/total per chunk) to actually stream the incoming file to the current fs (SPIFFS or SD, per storageType), so data folder assets can be updated over WiFi without a USB reflash.