Ice candidate gathering seems to get stuck

[slashblog]

Hi,
I am trying create webrtc connection between my server and client. For this I have used Pion as turn server. All goes fine I am able to establish the connection and transfer data. However one thing is that there seems to be a pause or hang in call to OnIceCandidate. I suspect something is getting stuck and timing out.

Following is the relevant code:

peerConnection.OnICEGatheringStateChange(func(is webrtc.ICEGathererState) {
	fmt.Println(is.String())
})

peerConnection.OnICECandidate(func(i *webrtc.ICECandidate) {
	if i == nil {
		fmt.Println("All candidates have been gathered")
		localDescription := encode(*peerConnection.LocalDescription())
		fmt.Println(ANSWER + localDescription)
                    
                    
                   // do something
	} else {
		fmt.Printf("Gathered candidate: %s\n", i.String())
	}
})

And this is the corresponding output:

2024/08/02 14:27:54 gathering
2024/08/02 14:27:54 Gathered candidate: udp4 host <ip>:45212
2024/08/02 14:27:54 Gathered candidate: udp6 host [<ip>]:35748
2024/08/02 14:27:54 Gathered candidate: udp6 host [<ip>]:47662
2024/08/02 14:27:54 Gathered candidate: udp4 srflx <ip>:8084 related 0.0.0.0:52738
2024/08/02 14:28:02 complete
2024/08/02 14:28:02 All candidates have been gathered
2024/08/02 14:28:02 Answer found to be

As you can see between Gathering of candidate # 4 and complete there is a pause of nearly 8 seconds. Can somebody kindly help me resolve this issue?