Failing to connect from espruino command line

Can you try updating espruino from NPM and doing it again? I tweaked it so it now waits longer to find BLE devices (if it needs to).

noble, the library used for BLE, says:

Note: on OS X the address will be set to 'unknown' if the device has not been connected previously.

Which is a bit frustrating - I guess as you've never used the Web IDE on it, it wouldn't get reported. Try espruino -p unknown and see if that helps? It may work.