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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.
@user123768
Thanks very much Gordon.
Now I've understood everything.
I've solved "CALLBACK" message.
GadgetBridge app was installed only on my phone, but not on the Bangle.js.
It was implicit (it's needed), but I haven't thought about it until now.
Sorry, sorry.
Thanks again.