Detect offline peer in WebRTC connection

Question

We are developing a video stream from a mobile device to a computer using WebRTC. The mobile device might lose its connection completely and the computer should be able to d

Answer 1

As a workaround in Firefox, you could use getStats to detect if packets stop coming in:

var findStat = (m, type) => [...m.values()].find(s => s.type == type && !s.isRemote);

var hasConnected = new Promise(resolve => pc.oniceconnectionstatechange =
  e => pc.iceConnectionState == "connected" && resolve());

var hasDropped = hasConnected.then(() => new Promise(resolve => {
  var lastPackets = countdown = 0, timeout = 3; // seconds

  var iv = setInterval(() => pc.getStats().then(stats => {
    var packets = findStat(stats, "inbound-rtp").packetsReceived;
    countdown = (packets - lastPackets)? timeout : countdown - 1;
    if (!countdown) resolve(clearInterval(iv)); 
    lastPackets = packets;
  }), 1000);
}));

Here's a demo: https://jsfiddle.net/4rzhe7n8/

Answer 2

the iceconnectionstatechange handler should fire after ~5-10 seconds of not receiving data from the peer anymore (in Chrome; Firefox is working on that currently). See https://webrtc.github.io/samples/src/content/peerconnection/states/ for an example.