Magic Byte bin file

[llewellyn]

Hi,

Does the esp32 bin file always start with 0xe9?

Regards

[Sprite]

Yes. Take care, however: ESP8266 apps starts with the same byte.

[llewellyn]

Hi ,

So is it safe to use this byte as the start of the bin to detect the end of http headers for OTA update?

Regards

[Sprite]

As long as you don't mind people also being able to accidentally chuck an esp8266 firmware image into the OTA thing, sure. If you want more verification, you can check components/bootloader_support/src/esp_image_format.c which does some validation of images in the bootloader.

[llewellyn]

Hi,

Thank You.
I will check it out.

Regards