gistfile1.rbx

#!/usr/bin/env ruby
require 'soap/wsdlDriver'

class Login
  attr_accessor :userName
  attr_accessor :password

  def initialize(userName = nil, password = nil)
    @userName = userName
    @password = password
  end
end

wsdl = "https://blablabla/servicename.asmx?WSDL"
service = SOAP::WSDLDriverFactory.new(wsdl).create_rpc_driver
service.wiredump_file_base = "soap-log.txt"

puts service.login(Login.new("foo", "bar")).inspect