"Serial1.on('data', function (data) {......" not works for me, is works for any other ??

Wow, thank you - that's awesome! Especially given your previous donations as well!

Thanks for everyone's help in tracking this down too. It's one of those nice cases where having Espruino on more platforms means more bugs get found and it gets more reliable for everyone.

Just FYI, the bug/fix is on https://github.com/espruino/Espruino/issues/1510 - in the end I went with just changing the call to jsvReadConfigObject to point to ints and copying them (as it seems that's what I'd done in other places).

As you suggested, JSV_CHAR would be a nicer idea, but we're using enums from the main interpreter where there isn't such a thing as a char. I guess it might make more sense to move to having a different set of enums for jsvConfigObject - it'd probably help to catch issues at compile-time too.