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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
Ahh, ok. Your problem could be that by default Espruino is acting as a normal command-line interface. It 'echo's the characters you send it back to you, and that could be causing buffering problems since it may be trying to send more characters to you than you are to it.
One way to debug would be to make sure you set notifications on the RX characteristic, and dump the data you receive back from Puck.js somewhere so you can see if you get any errors.
You can either send
echo(0)\nto stop echoing, or you can prefix each statement you send with\x10(char code 16) to stop it on a per-statement basis.The other easy solution to this is to run your code through the Espruino command-line tools: https://www.npmjs.com/package/espruino
If you do
espruino -p puck_bluetooth_address myfile.js -o output.jsthen it'll output the exact text that the IDE would have sent to Puck.js - you can then send that slightly modified text over yourself.