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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.
@!evil
I found the issue, and its not Espruino/Bangle. The callback isn't called twice (should have count it earlier) but the returned message on Nordic UART is processed twice on the remote side (Arch Linux, Intel 7260, Bluez 5.66). But only if I didn't remove the device using
bluetoothctlafter a reset.Sorry for the distraction!
For future reference: when the custom characteristic is added, and my Bluez already knows about the Nordic UART from previous discover, it would immediately disconnect after connect. So I'm forced to remove and rediscover. If, however, it knows about the custom characteristic and the custom characteristic is added during a reset, it wouldn't disconnect after connect but process incoming messages twice. Or at least thats what I see and I'm able to reproduce. Remove and rediscover solves the issue for me.