My setup is somewhat different, but it may give an indication. I have an i7-7600U laptop, which is about 50% slower than your CPU (because mine is an ultra-low power version... hence the U and the shitty performance). I run Linux and ESP-IDF, and a full compile of the 'hello world' is 54 seconds the...

How did you conclude that this (uncalled loop being called and halting) is what's happening?

@ESP_Sprite In your experience, is reduced ISR latency/jitter another valid reason to go to IRAM, or does it not really make a difference? Yes, it's also a reason some people put stuff in IRAM: if not there, it has to come from flash via the cache and if it's a relatively lightly used function, it ...

Actually, we have an optional wear leveling layer between fatfs and the 'raw' flash that alleviates a lot of the issues. If you don't need specifically flash FAT, then something like littlefs or spiffs might be a better option indeed though.

There's an open-source library for that here . I have no experience with it, but given that it purports to be portable and expects a POSIX interface, I'm decently sure it shouldn't be that hard to port to ESP-IDF. It can use the lower-level TCP/IP layers already available on the ESP32/ESP-IDF, so yo...

Yeah, sorry, you can't use the USB port for debugging and USB host at the same time. You can either change over to UART0 for debugging or programming, or add a 2nd USB PHY (e.g. a SP5301), but do note that the latter is somewhat undocumented; there's no easy tutorial.

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You'd probably want to use something like UDP for this. ESP-NOW isn't forwarded by access points, so you could get into the situation that two devices can talk over REST but not over ESP-NOW.

Well, ESP-Now is sent as packets, meaning on the receiving end there's no difference between 'the transmitter sent something that wasn't received' and 'the transmitter didn't send anything'. What you would want to do is send data periodically (e.g. every 100ms or so), and detect loss of Tx by notici...

Either use gpio_config(), or call gpio_reset() on the pin before your code.