Bug in Arduino-esp32 after 20/12/2017 ... duplicate issue: me-no-dev/arduino-esp32fs-plugin#6 (comment) and original source of solution(tips): https://www.mgo-tec.com/blog-entry-esp32-spiffs-easy-websocket-library.html

@me-no-dev Here it's working after change size of per-file metadata field from 4 to 0 on SPIFFS configs of IDF =)

Where is it in Arduino IDE?

@smacyas this option is only available using arduino as IDF component... For Arduino IDE it depends of @me-no-dev recompiles the core

@copercini thanks. Will be waiting for @me-no-dev recompile

@copercini from your message i understood that was from the configs of the components itself, but actually, you must change this value from make menuconfig and works ! Many thanks for your tip!

@copercini There is a file Arduino\hardware\espressif\esp32\tools\sdk\include\spiffs\spiffs_config.h, may be this option (size of per-file metadata field) is there can be defined?

okey, if it is so long to recompile core with newest IDF with this bug fix, may be someone will tell how to do it myself to make arduino-esp32 from IDF?

@smacyas take o look here: https://github.com/espressif/arduino-esp32/blob/master/docs/esp-idf_component.md

Pretty sure this problem is because of the change to the definition for SPIFFS_OBJ_META_LEN in spiffs_config.h that occurred a while back, but @me-no-dev will need to confirm. There was no corresponding change to the data upload plugin https://github.com/me-no-dev/arduino-esp32fs-plugin and that means file objects created by the plugin are no longer compatible with the SPIFFS library. As a temporary workaround I defined SPIFFS_OBJ_META_LEN to be 0 in Arduino/hardware/espressif/esp32/tools/sdk/include/spiffs/spiffs_config.h, then restarted the IDE. Reading uploaded data works fine for me now.

Hello,
I just tried your solution, but it did not work for me.
Is there something else which has to be configured?
I changed the line #define SPIFFS_OBJ_META_LEN (CONFIG_SPIFFS_META_LENGTH)
to #define SPIFFS_OBJ_META_LEN (0)
but I still cannot read the data...

@bospre, that is the only change I made, along with restarting the Arduino IDE. Before the change file.read() returned bogus data. After the change all is good. EDIT: Actually there was more thing I did that is what made the real difference -- see next sentence below:

EDIT: Turns out the real workaround is just to run the SPIFFS_Test.ino program after uploading your data file. As part of that test, the program writes a 1MB test file and writing that file somehow makes the uploaded data file subsequently readable.

@tferrin I think is rather impossible that you changed only the define in the 'spiffs_config.h' include file to
#define SPIFFS_OBJ_META_LEN (0)

the binary "libspiffs.a" is already compiled with the other setting and your define doesn't affect the code inside

you'd have to recompile or get another "libspiffs.a" already compiled with the header modified setting

So to fix this SPIFF issue then
could any Collaborator of this repository recompile the SDK then?
an alternative is to modify and recompile the dependent mkspiffs tool

(one of both)

You have to replace file from tools/sdk/lib/libspiffs.a to the same file from 70d0d46 commit. Thanks for this problem solving to @vindolin

I do not know why official person (@me-no-dev ) does not recompile the core

@smacyas thank you
but a better alternative is to use the new mkspiffs tool that contains the new sttings SPIFFS
is in the PR igrr/mkspiffs#36

@smacyas I suspect @me-no-dev is enjoying the Spring Festival or otherwise busy. He has been pulled into a number of things.
@igrr @copercini Can either of you provide a version of your built binary on a branch and we can reference it here for those who need it?

As per (espressif/esp-idf#1610 (comment)), @igrr has provided a 0.2.2 version () of mkspiffs that can be downloaded on its own (https://github.com/igrr/mkspiffs/releases/tag/0.2.2) until @me-no-dev spins a new version.

adopting the @igrr solution on espressif/esp-idf#1610

calling
mkspiffs.exe -c ./data -p 256 -b 4096 -s 1503232 -d 5 my.spiffs.bin
'SPIFFS mount failed with error: -10025'

anyway now seems to work

I'm honestly a bit confused still, so hopefully somebody can explain this. What is the correct way to fix this? It is a bit of a hack to manually download the new mkspiffs and drop it in the tools post install.

After switching to the head of master and updating my git submodules, it looks like tools/mkspiffs/ is no longer part of the git repo? Does a submodule need to be added/modified? What needs to be done so that people who install arduino-esp32 actually get a working mkpsiffs?

As @lonerzzz pointed out above, you need download and install version 0.2.2 of mkspiffs. It gets installed in hardware/espressif/esp32/tools/mkspiffs.

Sorry I wasn't clearer. I would consider @lonerzzz's solution a workaround, not a fix. Previously, arduino-esp32 provided the tool (I'm not sure if it was a submodule, or if it was included directly, but either way when I followed the install procedures, it was there). It looks like that is no longer the case. So, I could see one of the following being done:

1. Include mkpsiffs in tools/mkspiffs again.
2. tools/mkspiffs should be a submodule that pulls in the correct version of the tool
3. The install instructions should be updated to tell people to download/install the tool

As a user of this library, I would prefer to see either option 1 or option 2, since the tool is located within the arduino-esp32 tree. If it is no longer appropriate for mkspiffs to be an esp32 tool, then the arduino-esp32fs-plugin should be updated to include its own copy of mkspiffs (and people probably shouldn't be directed to include it in the tools directory).

I'm sure this will be fixed in due time. There has been some lag in commits during the past month due to work on other projects by key contributors. And please note that there has yet to be an actual release of the arduino-esp32 core, so officially it's all still experimental code. If you want a code base that is better supported you should consider the official Espressif IoT Development Framework -- https://github.com/espressif/esp-idf. It sees more active development and commits to the code base and is at the release 3.0-rc1 stage. (Not trying to be a nerd or make excuses. Just observations by one of many code contributors.)

Sure, and I get that this is still experimental/in development. I dug a bit more into the get.py script that is part of the install, and it looks like with a few minor changes there it is easy enough to pull in the correct mkpsiffs. I'll submit a pull request with those changes.

Thanks @tferrin for the explanation :) Works like a charm for me on MacOS with Arduino 1.8.5 !

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