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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
Hi,
Do you need it to be able to send data over 'in the background', or would it be acceptable to have the phone turned on and showing a webpage?
Because if you could have the webpage showing then you can just use Web Bluetooth and it's pretty easy. For example there's some code for real-time streaming at http://www.espruino.com/Bangle.js+Data+Streaming
Otherwise you're going to have to write some kind of Android app as @d3nd3-o0 says. If you don't want to get stuck into full-on Android development you might have some luck with DroidScript I guess: https://www.espruino.com/DroidScript+Puck.js
For Gadgetbridge, if you did want to customise it the code is at https://codeberg.org/Freeyourgadget/Gadgetbridge
The Bangle.js code you care about is in https://codeberg.org/Freeyourgadget/Gadgetbridge/src/branch/master/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java and you could just add some code to handleUartRxJSON to handle communication from the Bangle
The developer doesn't use GitHub because they blocked him temporarily due to a fraudulent DMCA request and it scared him off.