Hooray::Seek.lan(port, protocol).nodes - nomethod error

[okliv]

require 'hooray'
Hooray::Seek.lan(port, protocol).nodes

And corresponding question: what is the analog for hoo list if I use it as a lib?

Neither Hooray::Seek.new.nodes nor Hooray::Seek.new(nil).nodes list all devices that i have in my local network. hoo list from console has little better results...

Thanks