strange timing with setTimeout

Thanks - so it'll be related to the nRF52 I guess.

I think it's less likely to be a BLE issue, because the entire line is executed only when you hit enter - so in your example - especially var dt = new Date();setTimeout(function(){console.log(new Date() - dt);},100); - the UART shouldn't be doing anything while code is running.

I guess it could be related to the 'Utility Timer' somehow - that is platform-specific and may have some issues