code: function createDataChannel(label, dataChannelDict) {
      var configuration = this._configuration
          , mdm = configuration.mdm
          , stream = configuration.stream
          , channel = mdm.createStream(label)
  
      return new DataChannel(channel)
  }
docs: /* Wait until the connection is open.
  
  Then create a new stream through mux demux on the connection.
  
  The other peer will get a data channel event through the
  mux demux listener on the other end