code: function sendNameAlreadyTaken(senderMessage, senderInfo) {
  
          if (mode == "listen") {
              return;
          }
  
          var message = createMessage("NAMETAKEN");
          var socket = dgram.createSocket({ type: 'udp4', reuseAddr: true });
  
          socket.bind(function() {
              log("%s [%s] sent '%s' to %s:%s", name, id, message, senderInfo.address, senderInfo.port);
              socket.send(message, 0, message.length, senderMessage.port, senderInfo.address, function(err, bytes) {
                  socket.close();
              });
          });
  
      }
docs: Send my info to listeners