def _get(cmd, *args)
      raise ArgumentError, 'Invalid parameters' unless args[0].is_a?(Hash)

      requires_version(cmd, 3.4)
      res = @iface.call(cmd, args[0])
      # FIXME
    end
def _get(cmd, *args)
      raise ArgumentError, 'Invalid parameters' unless args[0].is_a?(Hash)

      requires_version(cmd, 3.4)
      res = @iface.call(cmd, args[0])
      # FIXME
    end
def _update