It's getting possible now - there's devices that 'harvest' ambient radio waves to power themselves - here's a device that has a full Bluetooth stack: https://9

It's getting possible now - there's devices that 'harvest' ambient radio waves to power themselves - here's a device that has a full Bluetooth stack: https://9to5mac.com/2019/01/15/battery-free-bluetooth-sticker-chip/ https://9to5mac.com/2019/01/15/battery-free-bluetooth-sticke...