How to use the haraka-net-utils.load_tls_ini function in haraka-net-utils

var last_recip = null;
    var ok_recips = [];
    var fail_recips = [];
    var bounce_recips = [];
    var secured = false;
    var authenticating = false;
    var authenticated = false;
    var smtp_properties = {
        "tls": false,
        "max_size": 0,
        "eightbitmime": false,
        "enh_status_codes": false,
        "auth": [],
    };

    var tls_cfg = net_utils.load_tls_ini();

    var send_command = socket.send_command = function (cmd, data) {
        if (!socket.writable) {
            self.logerror("Socket writability went away");
            if (processing_mail) {
                processing_mail = false;
                release_client(socket, port, host, mx.bind, true);
                return self.try_deliver_host(mx);
            }
            return;
        }
        var line = cmd + (data ? (' ' + data) : '');
        if (cmd === 'dot' || cmd === 'dot_lmtp') {
            line = '.';
        }
        if (authenticating) cmd = 'auth';