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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
New firmwares should have 'Storage' which will allow you to store complete files. It might make more sense to use that. The IDE at espruino.com/ide will work with serial devices and has a storage manager that allows you to upload files from your PC, and if you use one of the 'cutting edge' builds you can use
Storage.read(file,offset,length)to stream just a bit of it each request.