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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
The Pixl would support this, yes - all of the official Espruino Bluetooth boards have it enabled.
I would expect that the read/write would fail if the security restrictions weren't met - as you figured out something like
NRF.setSecurity({passkey:"123456", mitm:1, display:1});should do it I'd have thought.However: The Pixl will remember the pairing info from last time - which may not be secure. Have you tried setting it all up, then clearing the bonding info on your phone and connecting again and seeing if that works better?