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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
Ok, thanks - just fixed if you update your firmware.
Turns out BTHRMLite worked all along though: https://banglejs.com/apps/?id=bthrmlite
BTHRM sets custom connection parameters (to allow slower bluetooth HRM devices) - I'm not sure if that's needed or not (seems unlikely) but the bluetooth stack started rejecting it after I increased slave_latency to make connections more stable, because conn_sup_timeout had to change too