Unable to upload file to firebase storage

[monusuthar]

Hello Everyone,

I have made a data logger that records temperature and humidity and stores the data to an SD card. Now, I want to upgradeit to store a text file to Firebase storage whenever the ESP32 is connected to the internet. I checked the examples from Storage > Async/sync > Callback/no callback. After checking all three examples, I was unable to upload a media.mp4 file. I also uploaded a text file to the SD card and SPIFFS, and tested the text file upload, but I failed.

After all this testing, I opened the "List" example, and it was working. I could see the list of all the files (manually uploaded to Firebase storage) on the serial monitor, which means the Firebase setup and other credentials in the code are correct.

After all these attempts, I carefully removed all #if conditions and shortened the code only for ESP32 and SPIFFS. After uploading the code, I faced the same problem—the file was not uploaded. I restarted the ESP32 10-15 times, and then once a file uploaded (but it was an empty file). I repeated the same process: uploaded the code and pressed the RST button 10-15 times, and once the code uploaded successfully. During this process, I checked the serial monitor continuously, and every time it showed the same log (image attached).

So my questions are:

1. How do I define where to read the file from (SD Card or SPIFFS)? I can’t understand this part.
2. Why does the file only upload once in 10 tries?
3. why uploaded file is empty

[mobizt]

Filesystem is not a part of library, and you should define and initialize it in your code before use.

You should try with download example first for testing your filesystem.

The example is for demonstration how it works and what are required.

You have to define FileConfig object globally for your file which takes the filename and file callback in the constructor.

FirebaseClient/examples/Storage/Async/Callback/Download/Download.ino

Line 83 in 49726fe

FileConfig media_file("/media.mp4", fileCallback);

The file callback function is the function that provided the reference to the file object (which internally defined in the FileConfig), file name and mode.

FirebaseClient/examples/Storage/Async/Callback/Download/Download.ino

Lines 216 to 237 in 49726fe

	void fileCallback(File &file, const char *filename, file_operating_mode mode)
	{
	// FILE_OPEN_MODE_READ, FILE_OPEN_MODE_WRITE and FILE_OPEN_MODE_APPEND are defined in this library
	// MY_FS is defined in this example
	switch (mode)
	{
	case file_mode_open_read:
	file = MY_FS.open(filename, FILE_OPEN_MODE_READ);
	break;
	case file_mode_open_write:
	file = MY_FS.open(filename, FILE_OPEN_MODE_WRITE);
	break;
	case file_mode_open_append:
	file = MY_FS.open(filename, FILE_OPEN_MODE_APPEND);
	break;
	case file_mode_remove:
	MY_FS.remove(filename);
	break;
	default:
	break;
	}
	}

The file object will be initiated with file = MY_FS.open(...).

For SPIFFS filesystem as an example, you have to initialize it first.

FirebaseClient/examples/Storage/Async/Callback/Download/Download.ino

Line 144 in 49726fe

MY_FS.begin();

For your Filesystem e.g. SD, you have to replace the open function parameter for the mode.
FILE_OPEN_MODE_READ, FILE_OPEN_MODE_WRITE and FILE_OPEN_MODE_APPEND with the suitable SD file modes.

You have to check the basic SD example to see the predefined file modes.

For the latest ESP32 and ESP8266 core SDKs, you still can use FILE_OPEN_MODE_READ, FILE_OPEN_MODE_WRITE and FILE_OPEN_MODE_APPEND macros as an example for SD and SPIFFS which correspond to file modes: "r", "w", and "a".

If it does not work when all are correctly setup, that is your SD or filesystem problem which is out of control by the library.

[monusuthar]

"I don't understand. As I am a beginner, I just want to know what changes are required in the 'upload' code. Can I use the upload code directly, or are any changes required?"

[mobizt]

You can, but the problem is on your side related to your filesystems (SD and SPIFFS).

The fact is that library cannot read the file content to upload and you should solve this issue on your side.

It is not about you are new to this library, but you have to familiar with File class and filesystems (SD and SPIFFS) usage to prepare your filesystem to work with other libraries.

In Arduino IDE, there are the SD examples which you have to test it for read/write/append/delete to make sure it works before using it with other libraries.

[mobizt]

Actually, all examples in this library are ready to run without any modification unless sign in credentials.

If you cannot run the upload/download/OTA example code that means your device filesystem was defected, or the board SDK was outdated or not installed properly.

[mobizt]

Plenty of examples if you search google.
https://randomnerdtutorials.com/esp32-microsd-card-arduino/