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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.
@Gordon
Yes, that could be it...
The other issue could be if you're powering the receiver from your PC's USB and you're printing text. In this case if no terminal app is connected to Espruino, the PC/Mac won't receive the data printed from Espruino, and Espruino will just sit there waiting once its output buffer is full.