How does one send WebRTC ice candidates using 'xmpp.jingle.request'?

[marcusegues]

What is the correct way to send an ice candidate as a description-info Jingle message using XMPP-FTW?
Currently I have a handler on my RTCPeerConnection object as follows:

peerConnection.onicecandidate = event => {
    if (event.candidate) {
      const sdpJson = sjj.toSessionJSON(peerConnection.localDescription.sdp, {
        creators: 'initiator',
        role: 'initiator',
        direction: 'outgoing',
      });
      // not interested in sending application type data, only the transport type
      sdpJson.contents.forEach(content => {
        delete content.application;
      });
      const { peerJid, callId } = getJingleData(getState());
      xmppFtwSocket.emit(
        'xmpp.jingle.request',
        {
          to: peerJid,
          type: 'set',
          jingle: {
            action: 'description-info',
            sid: callId,
            contents: action.sdpJson.contents,
          },
        },
        (error, success) => {}
      );
    }
  };

Therefore, I'm simply grabbing my localDescription when I have a new ice candidate, because the ice candidate will be in the description at that point. and I turn it into JSON and send it via XMPP-FTW. However, the original candidate, in event.candidate also contained keys sdpMLineIndex and sdpMid, which are not sent in XMPP-FTW.

What is the correct way to send an ice candidate as a description-info Jingle message using XMPP-FTW?