Native Applications for Command-line and IDE

do you think Noble js code could run on top of espruino with the native noble C stuff

Wow. Honestly I have no idea - it's an interesting thought. I guess in terms of creating a multiplatform library it wouldn't help, but it'd be great to be able to get something working with Espruino in a bare-bones kind of way.

Having said that it looks like HCI might be reasonably low-level, but is probably relatively trivial to write a driver for to allow it to maintain a connection and read/write characteristics as you don't try to handle anything like bonding.