alt Hacker NewsI for one am surprised that ESP32 hasn't been reverse engineered much earlier, judging by its popularity
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The ESP32 is quite open, by the company, not by RE efforts. If you were under the impression that community RE was to praise for its usability, then you must be thinking of the ESP8266 or what came before it, not the ESP32.
This video is not about the entire ESP32 either.
This video is about one of the ESP32's radio functions, Bluetooth.
Espressif keeps their radio stuff closed for some reason. It might be due to licensing (if they bought parts of the radio), govt regulations of some countries mandating that users can't abuse the radio, or maybe it's trade secrets they want to keep secret to keep an edge on the market.
You don't appear to know much about the ESP32 and its ecosystem. You should, if you are at all interested in electronics, microcontrollers, or "Internet of Things".
Not much need for reverse engineering - with the exception of the radio blobs.
ESP-IDF is a bright stars when it comes to opensource HALs in the microcontroller world.