You mentioned you had an Android phone earlier - any chance you could try it with that and pressing enter, just to make sure?
You might have to do it twice, as if you've sent a load of commands previously without a newline there might be junk in the input buffer
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
You mentioned you had an Android phone earlier - any chance you could try it with that and pressing enter, just to make sure?
You might have to do it twice, as if you've sent a load of commands previously without a newline there might be junk in the input buffer