Webrtc：如何重新连接或监视连接

Question

我正在开发一个使用webrtc为两个人创建会议的APP。 实际上，我正在使用socket.io进行信号传输，并同时使用服务器眩晕和服务器转向。 （我是从http://xirsys.com/购买这些服务器的。）

最后，我在整个webrtc中都进行了连接，但是几分钟后，图像或视频被冻结，有时我错过了连接。

我对程序有误吗？如果发生任何情况，如何监视连接以重新连接？

完整的代码在Github中：https://github.com/lfdeiby/playwebrtc.git

并在Heroku中测试网站：https://gentle-reef-80146.herokuapp.com/

io.on('signaling_message', async ({data: {description, candidate}}) => {
    displaySignalMessage("Signal received");
    try{
        if (description){
            const offerCollision = (description.type == 'offer') && (makingOffer || pc.signalingState != 'stable');
            ignoreOffer = !polite && offerCollision;
            if( ignoreOffer )
                return;
            if (offerCollision) {
                await Promise.all([
                    pc.setLocalDescription({type: "rollback"}),
                    pc.setRemoteDescription(description)
                ]);
            } else {
                await pc.setRemoteDescription(description);
            }
            if( description.type == "offer" ){
                const answer = await pc.createAnswer();
                await pc.setLocalDescription(answer);
                io.emit('signal', {description: pc.localDescription, room: SIGNAL_ROOM});
            }
        }else if(candidate){
            try{
                await pc.addIceCandidate(candidate);
            }catch(err){
                displaySignalMessage(err.message);
                if(!ignoreOffer){
                    throw err;
                }
            }
        }
    }catch(err){
        console.log(err.message);
        INFO.error_signaling(err.message);
    }
});

function startSignaling() {
    displaySignalMessage("starting signaling...");

    pc = new RTCPeerConnection(config);

    for (const track of localStream.getTracks()) {
      pc.addTrack(track, localStream);
    }

    if( polite == false ){
        dataChannel = pc.createDataChannel('chat', null);
        dataChannel.onopen = function(){
            if( dataChannel.readyState == 'open' ){
                displaySignalMessage("Data Channel is ready");
                dataChannel.onmessage = dataChannelMessage;
                dataChannel.onclose = function(){ displaySignalMessage("Remote close conection"); closePeerConnection(); }
            }
        }
    }else {
        pc.ondatachannel = function(event){
            dataChannel = event.channel;
            dataChannel.onmessage = dataChannelMessage;
            dataChannel.onclose = function(){ displaySignalMessage("Remote close conection"); closePeerConnection(); }
        }
    }
    
    pc.onicecandidate = function(event){
        if (event.candidate){
            displaySignalMessage("Signal send: " + event.candidate);
            io.emit('signal', {candidate: event.candidate, room: SIGNAL_ROOM});
        }
    };

    pc.oniceconnectionstatechange = function(event){
        console.log("ICE CHANGE ", pc.iceConnectionState, event);
    }
    
    pc.onnegotiationneeded = function(){
        if( polite == false ){
            makingOffer = true;
            pc.createOffer(sdpConstraints)
            .then(function(offer){
                if (pc.signalingState != "stable") return;
                return pc.setLocalDescription(offer);
            })
            .then(function(){
                io.emit('signal', {description: pc.localDescription, room: SIGNAL_ROOM});
            })
            .catch(function(err){
                displaySignalMessage("ERROR OFFER", err.message);
            });
        }
    }

    pc.oniceconnectionstatechange = function(evt){
        displaySignalMessage("ICE connection state change: " + evt.target.iceConnectionState);
        if (pc != null && pc.iceConnectionState === "failed") {
            pc.restartIce();
        }
    };

    pc.onaddstream =  function (event) {
        videoRemote.srcObject = event.stream;
        signalingFinalizeSuccess();
    };
    
    pc.ontrack = ({track, streams}) => {
        track.onunmute = () => {
            if (videoRemote.srcObject) return;
            videoRemote.srcObject = streams[0];
        };
        signalingFinalizeSuccess();
    };

    pc.onerror = function(err){
        displaySignalMessage("PC ERROR: " + err.message);
        console.log(err);
    }

    function dataChannelMessage(data){
        console.log("datachannelReceive", data);
        displaySignalMessage(data);
    }

}