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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
I just checked - actually Puck.js does do WriteWithResponse (it doesn't do a simple write).
So I'm not really sure what the issue could be here - I think realistically we're going to need to sniff the BLE traffic while writing with the Puck and with another device, and compare the two