There's an ancient port on your TV that you might not know about

The RS-232 connection has been around for decades and it's probably still on your smart TV.
SlashGear

Your TV's RS-232 Serial Port Can Do A Lot More Than You Probably Realized

The RS-232, or Recommended Standard 232, is a serial communication protocol introduced in 1960 by the now-defunct Electronic Industries Association (EIA). If you're of a certain age and grew up with ...