Search for ESP32 DTS RTS, see e.g. here:
https://docs.espressif.com/projects/esp ... bootloader

For reference, the ESP-NOW error codes, including 0x3069, are defined in esp_now.h.

Yes.

https://github.com/skeeto/pdjson
sound promising.

https://github.com/squix78/json-streaming-parser
looks like it could be made to work without Arduino libs.

https://github.com/GOB52/gob_json
seems to be available for both Arduino and non-Arduino.

do you know where can I find some docs No, sorry. All I know is that some TRMs describe some of the relevant registers; the ESP32-S3 TRM seems to be a bit more 'verbose' in this regard than the "OG" ESP32's. Apart from that I guess you'd have to look at the IDF code to reverse-engineer what you nee...

It basically works like this: Code running on core A puts core B into reset (default after power up), writes the memory address from which core B should start executing code into a special register, then un-resets core B. This is, however, not how the cores coordinate during normal operation. For th...

pbuf_free: deallocating 0x3fcba7cc pbuf_free: custom_free_function 0x3fcba82c This looks interesting... custom_free_function seems to plausibly be a pointer to another data structure here. May be coincidence though. Another thing to check could be: When updating a library you must make sure that al...

What log messages do you get? Chances are some parameter error is returned and ESP_ERROR_CHECK causes a restart of the chip.

Partial answer here: https://www.instructables.com/ESPNow-a- ... -ACKs-Ret/

I'd expect that a lib like this which runs on C3 and S2 will run on an S3 with little to no modification; especially since, at a glance, I didn't see anything chip-specific in it. (But I think that using the IDF-provided mbedtls version for cryptography would be more efficient than redundantly build...