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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
You mean you want to create some kind of Bluetooth error on the other device that is writing that value?
I'm afraid that's not supported, but you could create another 'status' characteristic with 'notify' on it, and then when there was an error you could notify with an error code on that characteristic?