Additionally to lbernstone's recommendation:
I see SD Card being used, maybe reading/writing this blocks your timer interrupt

Looking at the photo, I have doubts whether the ceramic WiFi antenna (red rectangular) is soldered properly.
I would resolder it manually to see if it helps.

There is nothing wrong with library. You probably need to read logs more carefully.

FreeRTOS: FreeRTOS Task "flash_task" should not return, Aborting now!




You have and did show the log already, it said that flashTask() returned instead of looping forever.
And that does correspond to the ...

Now you are using vTaskDelay() instead of delay()
I'm doing the same in my code (not sure why anymore )

Probably I did it because of consistency in this environment ("more rtos") but obviously it's exactly the same.

Now you are using vTaskDelay() instead of delay()
I'm doing the same in my code (not sure why anymore )

Don't know if it makes any difference, but I would expect the Serial.start() be part of the setup(), like this:
void setup() {

Serial.begin(115200);
delay(100);
Serial.println("Hello World");

xTaskCreate(printTask, "print_task", 5000, NULL, 1, NULL);

xTaskCreate(flashTask, "flash_task ...

...or can I also skip using PlatformIO, and run ESP-IDF v5.x with Arduino on native VSC ?
Is that possible indeed? What PlatformIO benefits I would loose?

I read this looong thread https://github.com/platformio/platform-espressif32/issues/1225 about the support of Arduino ESP32 v3.0 based on ESP-IDF v5.x and it seems quite doubtful to me if PlatformIO will be supported on the new framework. Indeed I could use Tasmota, but I feel that fore me this ...

Actually, I was not planning (or aware of) upgrading from 2.0.16 to 3.0.1 :shock:

Does that mean that Tasmota is ahead of plain vanilla Arduino, or is it me somehow being behind with my installed (2.0.16) version?
AFAIK everything is up-to-date, but I may have overlooked something. Before ...

I adjusted platformio.ini as suggested. It takes some time until the Tasmota stuff was downloaded and installed. Then I gave the "Build" command in Platformio. The build fails however, see log below.

* Executing task: C:\Users\Erik\.platformio\penv\Scripts\platformio.exe run --environment env ...