The antenna performance seems to be quite bad while inside the plastic case though :( I was only able to connect to it every few tries and will often get disconnected, while having it outside of the plastic caseis more reliable.
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.
Oh, just noticed this, ordered some from different shops, let's hope I'll get nrf52 too. Do you have a photo of pcb?