+ * DONE - index_rd_ifra: last_clean issue
+ * DONE - fwrite failed error management (select, buffer where store unsent data, and fwrite check and retry)
+ * ABRT - index_wr.php::reload - reload is js-only function
+ * DONE - bug: after restart index_rd.php receive from prev clients a lot of req
+ * DONE - index_wr.php::chat
+ * DONE - index_wr.php::exit