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Strange. I tested also with Puck and even the newest release to rule out some Board-specific issue. No luck.
It gets paired, but no key or volume change gets recognized by either iPhone nor MacBook.
However, this is not the project I'm working on, just a way to debug things "from the other side".
My original issue was just solved thanks to a hint by @Gordon :)
In developing the Rotary Encoder as mouse wheel, I tested the Espruino mouse example with the latest 2v15 release for Puck.js. It worked with no problem on Linux and IOS although I had to clear out some old pairing data by doing a complete reset of the Puck.