I had a look at doing this myself recently to do iPhone -> Laptop transfers. Does this work for mobile -> desktop? I didn't think that WebRTC was available on mobile safari and therefore wouldn't work.
It depends on what you mean by "mobile" :) It works between Chrome on Android and desktop. Unfortunately, Safari (neither desktop nor mobile) doesn't support WebRTC.
This is really cool. I am curious why Chrome on iOS wasn't made available yet? (i.e. if there was technical roadblock that made it difficult for you to do so.)