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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
@dklinkman thanks - that's a good spot!
I don't know why it would fail though - looking at the code, it's identical to get the characteristic and service, so the only thing I can think is perhaps there was a character at the end of the topic - a stray space maybe?
(and yes - I just looked at the message that's posted, and @Grzegorz it's because you put
"/ble/write/e7:e0:57:ad:36:a2/nus/nus_tx "as the topic and not"/ble/write/e7:e0:57:ad:36:a2/nus/nus_tx")@Grzegorz I'm not sure how to help with this most recent problem. You had this working before, so presumably you have more of a chance of working out what you did then than I do now :)