Cannot be used without internet on the LAN

[MI-Class]

The version I use is [email protected] and the version of go is 1.18.
On the LAN and not available when there is no internet, then I modified /format/webrtcv3/adapter.go

This method

func (element *Muxer) WriteHeader(streams []av.CodecData, sdp64 string) (string, error)

About line 197

	// gatherCompletePromise := webrtc.GatheringCompletePromise(peerConnection)
	answer, err := peerConnection.CreateAnswer(nil)
	if err != nil {
		return "", err
	}
	if err = peerConnection.SetLocalDescription(answer); err != nil {
		return "", err
	}

	element.pc = peerConnection
	// waitT := time.NewTimer(time.Second * 10)
	// select {
	// case <-waitT.C:
	// 	// return "", errors.New("gatherCompletePromise wait")
	// case <-gatherCompletePromise:
	// 	//Connected
	// }
	time.Sleep(time.Millisecond * 1)
	resp := peerConnection.LocalDescription()
	WriteHeaderSuccess = true

	return base64.StdEncoding.EncodeToString([]byte(resp.SDP)), nil

so modify hereafter in lan without the use of the internet, but I don't know what is the cause of this problem, so... can you check what is the reason, and then repair under, thank you.

[MI-Class]

Perhaps because of the problem here, there is no configuration ice_servers in my configuration file, and then a default value is given when judging that there is no configuration.

func (element *Muxer) NewPeerConnection(configuration webrtc.Configuration) (*webrtc.PeerConnection, error) {
	if len(element.Options.ICEServers) > 0 {
		log.Println("Set ICEServers", element.Options.ICEServers)
		configuration.ICEServers = append(configuration.ICEServers, webrtc.ICEServer{
			URLs:           element.Options.ICEServers,
			Username:       element.Options.ICEUsername,
			Credential:     element.Options.ICECredential,
			CredentialType: webrtc.ICECredentialTypePassword,
		})
	} else {
		configuration.ICEServers = append(configuration.ICEServers, webrtc.ICEServer{
			URLs: []string{"stun:stun.l.google.com:19302"},
		})
	}
   ...