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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
There is currently no way to send Intents. That's definitely planned to be integrated into Gadgetbridge soon, but it's not there yet.
The best bet is probably to make the Bangle appear as a Bluetooth keyboard, then you can just send keypresses which I imagine can be detected by those apps? For instance keys F13 to F24 are unlikely to have any effect on the device normally but should be pretty easy to pick up.
edit: http://www.espruino.com/BLE+Keyboard
Or best to look at how the keyboard app works: https://github.com/espruino/BangleApps/blob/master/apps/hidkbd/hid-keyboard.js