Proper way to handle ICE restart

[Anil Wadghule]

Recently in my application, I have added a feature for ICE Restart whenever we detect ICE Connection state as 'disconected'

Basically here is what I do

STEP 1:

if (peerConnection.iceConnectionState === "disconnected") {

    // nothing

    republishForIceRestart();

}

STEP 2:

var republishForIceRestart = function () {

  peerConnection.onicecandidate = function() {

    console.log("no actionTaken on republish for onicecandidate")

  }

  handleIceConnectionStateChange(peerConnection);

  var publisherConstraints = {

  }

  publisherConstraints.iceRestart = true;

    peerConnection

    .createOffer(createdDescriptionIceRestart, errorHandler, publisherConstraints);

}

OBSERVATION:

1. In Janus logs, I see this

[WARN] [1601494747650989] ICE restart detected

[1601494747650989] Restarting ICE...

[8403247280081227] Updating existing session

2. But in Google Chrome's console of the browser on which ICE failed occurred, I see this.

~~~~ Setting up remote description for the received answer from remote

purple-breeze-5946#live:1 Uncaught (in promise) DOMException: Failed to set remote answer sdp: Called in wrong state: kStable

So looks like for the sent offer with iceRestart = true, Janus is sending the answer back and somehow there is an exception in setting up remote answer SDP with setRemoteDescription

Does anyone know if this flow for ICE restart is correct or am I missing anything?

--

Thank you,

Anil

[Lorenzo Miniero]

Just FYI, ICE restarts only make sense when you were connected (PeerConnection was up) and then it got to failed later on, which means you should track these state changes, and not simply react to a single event out of context. I don't think they're much use when ICE gets to disconnected, as possibly the browser has already cleared the stack at that point.

That said, your error seems to suggest that you're setting an answer but you didn't set an offer for the restart before (maybe you forgot setLocalDescription before sending the SDP to Janus?)

L.

[Anil Wadghule]

Thanks Lorenzo.

Below thread on webrtc-user suggestes ICE restart shoud happen upon detection of ICE state disconnected event.

https://groups.google.com/forum/#!searchin/discuss-webrtc/iceRestart%7Csort:date/discuss-webrtc/I4K8NwN4Huw/q0iUVQ-SBgAJ

Also I added logging and can say that I am doing setLocalDescription before sending the SDP to Janus.

Not sure.. what's wrong there.

Thanks,

Anil

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Best,

Anil

[Anil Wadghule]

Hello,

I am not able to find much documentation about how to do proper ICE restart in WebRTC..

Anyone here knows any link for more info about it?

Thank you,

Anil

On Wednesday, 16 May 2018 18:33:39 UTC+5:30, Anil Wadghule wrote:

Thanks Lorenzo.

Below thread on webrtc-user suggestes ICE restart shoud happen upon detection of ICE state disconnected event.

https://groups.google.com/forum/#!searchin/discuss-webrtc/iceRestart%7Csort:date/discuss-webrtc/I4K8NwN4Huw/q0iUVQ-SBgAJ

Also I added logging and can say that I am doing setLocalDescription before sending the SDP to Janus.

Not sure.. what's wrong there.

Thanks,

Anil

For more options, visit https://groups.google.com/d/optout.

--

Best,

Anil

[Lorenzo Miniero]

https://medium.com/the-making-of-appear-in/ice-restarts-5d759caceda6

https://janus.conf.meetecho.com/docs/JS.html#renegotiation

L.

[Anil Wadghule]

Thanks, Lorenzo for the links.

Yes, I have successfully implemented Janus Renegotiation in my application. It works fine.

I went through above appear.in link too. It didn't help much for the ICE Restart I am implementing. Need some example or steps. I am for sure doing something wrong.

Thanks,

Anil

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Best,

Anil