def discover_infos(node=nil)
      hash = {'xmlns' => Namespaces::DiscoverInfos}
      hash['node'] = node if node
      iq = connection.iq_stanza({'to'=>jid}, x('query', hash))
      send_iq_stanza_fibered iq
    end
def discover_infos(node=nil)
      hash = {'xmlns' => Namespaces::DiscoverInfos}
      hash['node'] = node if node
      iq = connection.iq_stanza({'to'=>jid}, x('query', hash))
      send_iq_stanza_fibered iq
    end
discovers infos (disco#infos) about an entity
 can optionally specify a node of the entity