Failed to execute 'send' on 'RTCDataChannel': RTCDataChannel.readyState is not 'open'

Question

I am trying to learn WebRTC . I copied some codes and i get this error:

Any one can help?

code score: http://www.tutorialspoint.com/webrtc/webrtc_text_demo.htm

Have you installed all required libraries for your app through `npm install` ?? — Umair Shah, Aug 17 '16 at 00:19
I believe this should help : http://stackoverflow.com/questions/22470291/rtcdatachannels-readystate-is-not-open — Umair Shah, Aug 17 '16 at 00:22
Also take a look over the MDN too : https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel/readyState — Umair Shah, Aug 17 '16 at 00:22
I run the server with node (cmd) and the html file in the browers. I did install via npm. I looked at these links and i cound find any help there. — GentleMan, Aug 17 '16 at 00:29
my code is exectly the code from the totorial. i just copied it — GentleMan, Aug 17 '16 at 00:31
i have tried anothr totorial at : http://www.tutorialspoint.com/webrtc/webrtc_sending_messages.htm i have the same problem. what am i missing ? — GentleMan, Aug 17 '16 at 01:42
Those tutorials are old! Try removing `{optional: [{RtpDataChannels: true}]}`. That old Chrome-only stuff no longer works. — jib, Aug 17 '16 at 02:49
Well I cant see the original error any more but the program still wont function correctly. The message was not transferred . What is wrong ? Maybe its connected to another error i get " Uncaught SyntaxError: Unexpected token H in JSON at position 0 " ? — GentleMan, Aug 17 '16 at 09:33
after removing this line it seems to send the data but on the other side of the datachanle the onmmesege even wont triger — GentleMan, Aug 17 '16 at 11:57

score 11 · Answer 1 · answered Oct 19 '16 at 07:24

Add ondatachannel handling after removing {optional: [{RtpDataChannels: true}]}:

  myConnection.onicecandidate = function (event) { 

     if (event.candidate) { 
        send({ 
           type: "candidate", 
           candidate: event.candidate 
        });
     } 
  }; 

  myConnection.ondatachannel = function(event) {
     var receiveChannel = event.channel;
     receiveChannel.onmessage = function(event) {
        console.log("ondatachannel message:", event.data);
     };
  };

  openDataChannel();

This should be the answer! Tried this and worked perfectly after trying for hours! Why is this the case? — Kevin, Dec 13 '18 at 08:22

score 0 · Answer 2 · answered Jun 12 '20 at 06:10

0

The same error was thrown to me .This is because your peers are not connected and you are sending data.This was solved by this:

peer.on('connect', () => {
    console.log('I am connected now')
    peer.send('sending data blah blah')
  })

answered Jun 12 '20 at 06:10

Sachin Negi

51
1
4

Failed to execute 'send' on 'RTCDataChannel': RTCDataChannel.readyState is not 'open'

2 Answers2