Mojo currently lacks docs and tests but heres the examples.

m = Mojo::Message.new(:username => 'shift', :gadget_key => '...', :secret => '...')
m.send(:recipient => '+44785000000', :text => "say something.")
m.get # retreaves the recent message list

c = Mojo::Call.new(:username => 'shift', :gadget_key => '...', :secret => '...')
c.send(:caller => "+44", :callee => "+41")
c.get # retreaves the recent call list

Its more of a 20min hack around then a full blown library for Mojo's API but if I can find the time I'll try and maintain it.