I also met the same problem by using the latest espruino_2v01_RAK8212.hex (3 April,2019), could you please share with me how to solve it?
I didn't solve it! Gordon did.
@Kartman started
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.
I also met the same problem by using the latest espruino_2v01_RAK8212.hex (3 April,2019), could you please share with me how to solve it?