Issue with strophe.jingle.adapter.js createDataChannel()

[wififorhumanity]

Any thoughts on why adding 'createDataChannel' causes the following connection issue with supposedly malformed SDP? Removing that line makes it work perfectly again. The dataChannel is successfully created, and it appears that it is only sent on the offer SDP, not on answer. Reading everything related online to dataChannels doesn't point to the solution, has this been successfully implemented? peerconnection.ondatachannel is never called, which may be why the answerer never sends it back?

In Chrome/Canary console:

setRemoteDescription error Failed to set remote answer sdp: Offer and answer descriptions m-lines are not matching. Rejecting answer.

Affected code:

function TraceablePeerConnection(ice_config, constraints) {
    var self = this;
    var RTCPeerconnection = navigator.mozGetUserMedia ? mozRTCPeerConnection : webkitRTCPeerConnection;
    this.peerconnection = new RTCPeerconnection(ice_config, constraints);

    try {
        // Data Channel api supported from Chrome M25. 
        // You might need to start chrome with  --enable-data-channels flag.
        var dataConstraint = {reliable:false};//null;
        sendChannel = this.peerconnection.createDataChannel("sendDataChannel", dataConstraint);
         this.peerconnection.ondatachannel = receiveChannelCallback;

        self.trace('Created send data channel');
    } catch (e) {
        alert('Failed to create data channel. ' +
          'You need Chrome M25 or later with --enable-data-channels flag');
       self.trace('Create Data channel failed with exception: ' + e.message);  
    }

[fippo]

data channels are not yet handled by the jingle mapping -- i.e. they're ignored.

The spec for that was published only a few days ago, http://xmpp.org/extensions/xep-0343.html and I know someone is already working on that. Expect some progress after FOSDEM hopefully.

[wififorhumanity]

Right, I read this on the mailing list but wasn't sure. Thanks for the confirmation, I'll hold tight for FOSDEM.