docs: function handleDC(dc,relay,fwd,ld){
  
    function signalOpen(){
      relay.forwarding = false;
      relay.dc = dc;
      fwd.listen(startHandover,[relay]);
    }
  
    handleUnpacker(dc,ld.connection,ld.unpacker,ld.connection.bytes);
    if(dc.readyState == 'open') signalOpen();
    else dc.onopen = signalOpen;
  
  }