-local connlisteners_register = require "net.connlisteners".register;
-
-local t_insert = table.insert;
-local t_concat = table.concat;
-local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
-local m_random = math.random;
-local format = string.format;
-local sessionmanager = require "core.sessionmanager";
-local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
-local st = require "util.stanza";
-