node.js - Measuring transmission delay - node.js

Question

I am attempting to figure out how long it takes node js to send n number of packets. My ultimate goal is to find the transmission delay of the network. I did a recursive function so the next packet does not send until the previous one is complete. Here is my code so far. Am I doing it correctly?
var sizes=[200,400,600,800,1000];
// NOTE: the port is different
var host = "127.0.0.1", port = 33334;
var dgram = require( "dgram" );
var client = dgram.createSocket( "udp4" );
/*
client.on( "message", function( msg, rinfo ) {
var end = new Date().getTime();
var total = end - start;
console.log( "The packet came back in "+ total+" MiliSeconds");
});
*/
// client listens on a port as well in order to receive ping
client.bind( port, host );
var number_packets = 50;
var packet_size = 100;
var count = 0;
var end;
var start = new Date().getTime();
var message = new Buffer(packet_size);
send(message);
function send(message) {
client.send(message, 0, message.length, 33333, "127.0.0.1", function(err, bytes){
count++;
console.log("pkt #: "+count);
if(count < number_packets)
send(message);
if( count >= number_packets ) {
end = new Date().getTime();
var total = end - start;
console.log("total: "+total);
}
} );
}
There is a server.js that receives the packet and writes to console that there has been a packet received.