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If you know where to look, I'm quite sure you can already do this with vanilla ESP-IDF. I don't have a VNA or whatever is used to measure power at the antenna, but I do have a precision ammeter that confirmed my changes were effective at the supply. I only changed PHY power parameters and a lot more power was going somewhere.

Also, in my limited understanding, even changing the physical antenna can alter transmission power characteristics in such a way that it likely violates some limit, at least for some very specific wavelength or direction.

This is very interesting. I'm keen to get involved but, while I'm very experienced with ESP32, I don't have experience with this type of reverse engineering.

How long did it take you to get the environment and tools set up, so you could start digging in?

Is time or money a more valuable investment at this stage? If it's not too forward, how much would be useful to your organisation? (I can email if preferred.)