No he work, i have modified somme file in AjaxChat integration 3.2.1 (package-info, ..), actualy the chat work, but only admin's SMF user can access to the room, all other enregistred SMF user can't.access.
in the chat/lib/config.php, i have
$config['allowGuestLogins'] = true;
$config['allowGuestWrite'] = true;
$config['allowGuestUserName'] = true;
and no way.