• While I wrote my post I disconnected my Espruino. Now, after plugging it in and uploading the changed code (with headers:) it works!

    However, if I reset the board and try again - the problem seems to occur again.

    Spending a few seconds (10-15 seems to do the trick) between each test is somewhat of a productivity sink, but I can live with that...

    Sorry for posting before trying the 'obvious'

    Did you turn it off and on again?

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