Anything that's got wireless/bluetooth integrated is probably backdoored already, but the esp32 certainly has been (https://www.techspot.com/news/107073-researc

Anything that's got wireless/bluetooth integrated is probably backdoored already, but the esp32 certainly has been (https://www.techspot.com/news/107073-researchers-uncover-hidden-backdoor-widely-used-esp32-microchip.html https://www.techspot.com/news/107073-researchers-uncover-hid...) The entire point of of designing your own chip is so that you know there won't be any surprises. Nothing undocumented.