I should add though that you don't have to bond - so when Gadgetbridge asks you if you want to you can always answer No.
In that case the connection to the Bangle won't be encrypted, but honestly the chance of someone deciding to sniff Bluetooth traffic to get the contents of your notifications for most people is pretty slim.
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.
I should add though that you don't have to bond - so when Gadgetbridge asks you if you want to you can always answer
No
.In that case the connection to the Bangle won't be encrypted, but honestly the chance of someone deciding to sniff Bluetooth traffic to get the contents of your notifications for most people is pretty slim.