Bluetooth.scan fails to find devices on ruby 2.2.3, OSX 10.11.5

[baob]

iPhone SE, IOS 10.1, with bluetooth active placed right next to macbook pro (late 2013), with bluetooth active. Using OS X 10.11.5, ruby 2.2.3.

Any help welcome.

In case of any ambiguity in the above:

$ irb
2.2.3 :001 > require 'bluetooth'
 => true
2.2.3 :002 > Bluetooth.scan
 => []