1000 bytes is a very low stack size. Try 4096.

Side note: The comment on priority is wrong (0 is lowest)

You're missing a bunch of the #includes from my above comment.
And you will need to add component dependencies to your 'my_boot_hooks' component's CMakeLists.txt:

Could you please share the code or instructions on how to do this? I'm not proficient in tinkering with the bootloader It will probably be easiest to use the bootloader hooks feature. Take a look at examples/custom_bootloader/bootloader_hooks. Bootloader RTC reset example: #include "soc/rtc.h" #inc...

Incidentally, there is a Kconfig option to reserve memory at the start of RTC slow memory - it's designed for the ULP, but there's no reason why you can't use it for anything else. If your target supports it, you can enable the ULP and then the option to set the size of this reserved area will appea...

It's unclear from the schematic but your slide switch almost certainly has 3 pins, allowing you to define the level for both positions. Connect one to GND for "Off", and the other to 3V3 through a 10k resistor for "On". You can do away with R7 then, and arguably the reset button too.

Yes, you should be able to achieve the specified deep sleep current. An external RTC crystal will increase this, however. I've never used one so I don't know by how much exactly. There's a good chance this is the culprit, at least partially. Yes, ESP-IDF will power down everything possible automatic...

What ammeter are you using? Where exactly are you measuring this current? What power supply are you using? What regulator are you using? What other external peripherals are connected? Can you share a schematic? Do you have external bias resistors on the MOSFET gates? Have you confirmed Vgs is as exp...

You are sending both the content length header and a chunked encoding header. This is not a valid HTTP request. esp_http_client will take care of this for you based on the length you provide to esp_http_client_open (see https://github.com/espressif/esp-idf/blob/8ba96ab87389dd5400b7670a14356ea8620223...

You are writing the file using println, which in Arduino-land will usually append \r\n (https://reference.arduino.cc/reference/ ... l/println/).
When you read it back with readStringUntil('\n'), the resulting string will then include the '\r'.

1&2. Yes, an ESP32 can have a HTTP server to respond to requests from clients, as well as a HTTP client to send requests to servers. They may speak the same language but these are separate functions with different roles. 3. No, but this isn't a concern. Your typical router firewall will block all in...