Can

So this week end i watched a movie on Youtube "Algorithm" and the main character made a "can" that has some electronics on it, like a raspberry pi or a arduino FOR EXAMPLE, and i would know if is it able to do one and probably some who can tell me how to make one,, so with that he leaves that in a house and then the can searche for wifi networks who are vulnerable with the reaver (routers beetwen 2009-+-2012) and when cracked it makes a MITM attack to hijack gmail account and then send to his computer EVERYTHING it caches, if anyone hasn´t any ideia of what i´m talking about heres the link of the movie.