How to use the drachtio-modesl.Server function in drachtio-modesl

server.listen(listenPort, listenAddress, () => {
      this.listenAddress = server.address().address;
      this.listenPort = server.address().port ;
      this._server = new esl.Server({server: server, myevents:false}, () => {
        this.emit('connect') ;

        // exec 'sofia status' on the freeswitch server to find out
        // configuration information, including the sip address and port the media server is listening on
        this._conn.api('sofia status', (res) => {
          const status = res.getBody() ;
          let re = new RegExp(`^\\s*${profile}\\s.*sip:mod_sofia@((?:[0-9]{1,3}\\.){3}[0-9]{1,3}:\\d+)`, "m");
          let results = re.exec(status) ;
          if (null === results) throw new Error(`No ${profile} sip profile found on the media server: ${status}`);
          if (results) {
            this.sip.ipv4.udp.address = results[1] ;
          }

          // see if we have a TLS endpoint (Note: it needs to come after the RTP one in the sofia status output)
          re = new RegExp(`^\\s*${profile}\\s.*sip:mod_sofia@((?:[0-9]{1,3}\\.){3}[0-9]{1,3}:\\d+).*\\(TLS\\)`, "m");
          results = re.exec(status) ;