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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.
@CarlR
I found the problem - it was the music-player I was using. I switched to the current most popular Android one and the data then started turning up. Oddly, the 'Gadgetbridge Music Controls' app had worked when I tried it before, but was a bit flaky. Anyway, thanks for the help.