Mildly related, in the chapter Blinkenlights, Michal Zalewski describes the led indicator technology, and how it can be used for passive reconnaissance of seria

Mildly related, in the chapter Blinkenlights, Michal Zalewski describes the led indicator technology, and how it can be used for passive reconnaissance of serial data: https://nostarch.com/download/silence_ch05.pdf https://nostarch.com/download/silence_ch05.pdf