I wonder how it offers bi-directional communication? Do mobile devices have to h...

		kbumsik on July 17, 2023 \| parent \| context \| favorite \| on: Infrared may no longer be a punchline, as IEEE app... I wonder how it offers bi-directional communication? Do mobile devices have to have small light bulb (like infrared) to support bi-drectional communication? It would be too big for modern smartphone though.