无法建立RTC对等连接

问题描述

我了解了MDN中的WebRTC，并尝试打开对等连接。我决定在一个页面中同时打开本地和远程连接，并编写了以下代码：

const configuration = {iceServers: [
    {urls: 'stun:stun.l.google.com:19302'},{urls: 'stun:stun1.l.google.com:19302'},]};

const localConnection = new RTCPeerConnection(configuration);
const remoteConnection = new RTCPeerConnection(configuration);
let localSendChannel,remoteSendChannel;

localConnection.onicecandidate = ({candidate}) => {
    console.log('local candidate',candidate);
    if (candidate) remoteConnection.addIceCandidate(candidate)
}

remoteConnection.onicecandidate = ({candidate}) => {
    console.log('remote candidate',candidate);
    if (candidate) localConnection.addIceCandidate(candidate)
}

const connect = async () => {
    const offer = await localConnection.createOffer();
    console.log('local offer',offer);
    await localConnection.setLocalDescription(offer);
    console.log('local localDescription',localConnection.localDescription);
    await remoteConnection.setRemoteDescription(localConnection.localDescription);
    
    const answer = await remoteConnection.createAnswer();
    await remoteConnection.setLocalDescription(answer);
    console.log('remote answer',answer);
    console.log('remote localDescription',remoteConnection.localDescription);
    await localConnection.setRemoteDescription(remoteConnection.localDescription);

    localConnection.addEventListener('connectionstatechange',(e) => {
        console.log('localConnection new state',e.connectionState);
    });
    
    remoteConnection.addEventListener('connectionstatechange',(e) => {
        console.log('remoteConnection new state',e.connectionState);
    });

    const gumStream = await navigator.mediaDevices.getUserMedia({video: false,audio: true});
    for (const track of gumStream.getTracks()) 
        localConnection.addTrack(track);
}

const openLocalChannel = async () => {
    localSendChannel = localConnection.createDataChannel("sendChannel");
    localSendChannel.onopen = () => {
        console.log('local datachannel was opened');
        localSendChannel.send("Hello,world!")
    }
    
    localSendChannel.onclose = () => console.log('local datachannel was closed');
    localSendChannel.onmessage = (msg) => console.log('local channel got message',msg);
}

const waitRemoteChannel = () => {
    remoteConnection.ondatachannel = (e) => {
        remoteSendChannel = e.channel;
        console.log('remote atachannel was init');
        
        remoteSendChannel.onopen = () => console.log('remote datachannel was opened');
        remoteSendChannel.onclose = () => console.log('remote datachannel was closed');
        remoteSendChannel.onmessage = (msg) => console.log('remote channel got message',msg);
    };
}

const start = async () => {
    await connect();
    waitRemoteChannel();
    await openLocalChannel();
    
    localConnection.addEventListener('connectionstatechange',async (e) => {
        console.log('localConnection new state',e.connectionState);
    });
}

start();

我在Chrome中没有任何候选人，而在FireFox中只有null个候选人。你能指出哪里错了吗？

已更新：我在连接创建后向代码媒体轨道添加了添加和尝试创建数据通道的尝试。但是问题仍然存在

解决方法

您对连接不做任何事情，也没有添加轨道或创建数据通道。结果，该报价将在形式上有效，但不会导致冰候选人聚集，没有候选人，他们将没有任何联系。