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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
NRF connect should show the device and the 'raw' data, and you can decode it based on https://bthome.io/format/
Packet count is incremented by the watch, but the receiver then looks at the packets and discards any advertising data unless the packet count is different.
Changing apps on the Bangle would likely restart the code and change the packet count, but when it restarts it'll end up sending a packet with no button pressed in it