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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
Glad you figured it out! Potentially if your music player is responding the button presses (rather that via the commands issued from GadgetBridge) you can use https://banglejs.com/apps/#hidmsic
The difference is that the app above makes Bangle.js look like a Bluetooth keyboard - so when you send a command it seems to the phone like you're physically pressing a button. While it's a bit more hassle it might work with your app more like you expect.
Also, the BangleApps repo isn't automatically updated - I manually do it maybe once a week. If you want the absolute latest then you can use the GitHub version: https://espruino.github.io/BangleApps/#gbmusic