WebRTC не отправляйте видео в ответ

Question

У меня есть вопрос, касающийся WebRTC, и я установил простую демонстрацию двух пиров, которые могут отправлять данные друг другу.

Теперь, когда клиент 2 хочет получить предложение, он отправляет видео со своей камеры.

но клиент не отсылает ссылку на скрытое видео в ответе SDP, я не знаю почему.

это мой код:

HTML часть

<textarea id="text"></textarea><br><br>
<video id="localVideo" autoplay muted style="width:10%;"></video>
<script src="/socket.io/socket.io.js"></script>

часть JavaScript

<script type="text/javascript">
 //video
  let localVideo;
  
  navigator.getUserMedia = navigator.getUserMedia || navigator.mozGetUserMedia || navigator.webkitGetUserMedia;
  localVideo = document.getElementById('localVideo');
  remoteVideo = document.getElementById('remoteVideo');
  let constraints = {video: true,audio: false,};
  if(navigator.getUserMedia) {
   navigator.getUserMedia(constraints, getUserMediaSuccess, getUserMediaError);
  } else {alert('Your browser does not support getUserMedia API');}
  function getUserMediaSuccess(stream) {
   localStream = stream;
   localVideo.src = window.URL.createObjectURL(stream);
  }
  function getUserMediaError(error) {console.log(error);}
 //video
 var text = document.getElementById('text')
 var peerConnection;
 var peerConnectionConfig = {'iceServers': [{'url': 'stun:stun.services.mozilla.com'}, {'url': 'stun:stun.l.google.com:19302'}]};
 
 socket = io.connect('http://localhost:8080')

 socket.on('ilyes',(data)=>{
  console.log('i am saying : ' + data)
 })
 socket.on("R-ice",(data)=>{
  var id = data.me
  console.log('2_ice : ' + JSON.stringify(JSON.parse(data.ice).ice))
  var ice = JSON.parse(data.ice).ice
  if(!peerConnection)

    peerConnection = new RTCPeerConnection(peerConnectionConfig);
    //datachannel
     sendChannel = peerConnection.createDataChannel('sendDataChannel');
     console.log('dataChannel is created : ' + sendChannel.readyState)
     sendChannel.onopen = function(){console.log('onopen from LOCAL is GREAT')};
     sendChannel.onclose = function(){console.log('onclose from LOCAL is GREAT')
              window.location.reload()
             };
     peerConnection.ondatachannel = receiveChannelCallback
     console.log('for now everything is OK')

    peerConnection.onicecandidate = function RgotIceCandidate(event){
             if(event.candidate != null){
              var icee = event.candidate
              console.log('got ICE : '+ JSON.stringify({icee}))    
              socket.emit('ice',{ice : JSON.stringify({icee}),me:id})
             }
            };
    peerConnection.addStream(localStream);

  
  peerConnection.addIceCandidate(new RTCIceCandidate(ice));
  console.log('ice added')
 })
 socket.on("R-sdp",(data)=>{
  console.log('Rsdp sent : ' + data)
  var id = data.me
  console.log('le me is : ' + id)
  if(!peerConnection)

    peerConnection = new RTCPeerConnection(peerConnectionConfig);

  var description = JSON.parse(data.sdp).description
  var sdp = JSON.stringify(description)
  var offer =JSON.parse(sdp).type
  console.log('attendre le ansewer')
  peerConnection.addStream(localStream);
  peerConnection.setRemoteDescription(new RTCSessionDescription(description), function(){
    console.log('offer est : ' + offer)
    if (offer=="offer"){
     peerConnection.createAnswer(function RgotDescription(description){
             console.log('got description : '+ JSON.stringify({description}))
             peerConnection.setLocalDescription(description,function(){
              socket.emit('sdp',{sdp:JSON.stringify({description}),me:id})
             }, function(){console.log('sdp error')})
            }, createAnswerError);
     console.log('ansewer sent')
    }
  })
  
 })

 function createAnswerError(error){
  console.log('il ya une erreur dans le ansewer : ' + error)
 }
 function receiveChannelCallback(event) {
  console.log('Reciev Data: ' + event.data);
     receiveChannel = event.channel;
     receiveChannel.onmessage = handleReceiveMessage;
     receiveChannel.onopen = function(){console.log('onopen from REMOTE is GREAT')};
     receiveChannel.onclose = function(){console.log('onclose from REMOTE is GREAT')};
 }
 function handleReceiveMessage(event) {
  console.log('msg recieved : '+ event.data)
  text.value = event.data
  socket.emit('data',text.value)
 }
</script>