Theatres could use this effect to have people "magically" appear and disappear from the stage, and it's pretty simple in ...

From simple port and GPIO expansion ... then you’ll be glad to know that the Raspberry Pi Foundation releases mechanical drawings, schematics, and even 3D models of their boards.

But what if you have a Raspberry ... a simple UDP transmit device. The Ethernet connection itself is handled by the lwip stack. Connection to the RJ45 socket can be made from any of the Pi Pico ...