new to ethernet please help

guys i have modyfy the web client repiting code to make multy request on my lan apache server and hits a link with variables so the php script to read data from mysql and sends to arduino

as firt step is to make themulty request ant to get on serial the html code

this works fine when i use internet site e.g.

but when i use my server on lan works too!! but some time delays and lags!

so i add this 2 lines W5100.setRetransmissionTime(0x07D0); W5100.setRetransmissionCount(5);

this fix things lot better but some times lags agen...

some help please


some help please

Without seeing your code? I don't think so.

my server listen to 8083 port!!

#include <SPI.h>
#include <Ethernet.h>
//#include <string.h>
//#include <WString.h>

#include <utility/w5100.h>

// assign a MAC address for the ethernet controller.
// fill in your address here:
byte mac = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
// fill in an available IP address on your network here,
// for manual configuration:
IPAddress ip(192,168,1,55);

// fill in your Domain Name Server address here:
IPAddress myDns(192,168,1,1);

// initialize the library instance:
EthernetClient client;

//char server = “”;

byte server = { 192, 168, 1, 3 };

unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
boolean lastConnected = false; // state of the connection last time through the main loop
const unsigned long postingInterval = 10*1000; // delay between updates, in milliseconds

int ledPin = 13;

char rfid = {“252525”};

//String readString = String(100); //string for fetching data from address
char readString[STRING_BUFFER_SIZE];
int bufindex=0;

void setup() {
// start serial port:
// give the ethernet module time to boot up:
pinMode(ledPin, OUTPUT);

// start the Ethernet connection using a fixed IP address and DNS server:
Ethernet.begin(mac, ip);
//setRetransmissionTime sets the Wiznet’s timeout period, where each unit is 100us, so 0x07D0 (decimal 2000) means 200ms.
//setRetransmissionCount sets the Wiznet’s retry count. retry count of 2 or 3 makes the connect function fail really quickly.

digitalWrite(ledPin, HIGH);
// print the Ethernet board/shield’s IP address:
Serial.print("My IP address: ");

void loop()


// if there’s incoming data from the net connection.
// send it out the serial port. This is for debugging
// purposes only:
if (client.available())
char c =;

readString[bufindex] = c;



// if there’s no net connection, but there was one last time
// through the loop, then stop the client:
if (!client.connected() && lastConnected)

digitalWrite(ledPin, LOW);
//Serial.println(millis() - lastConnectionTime);


// if you’re not connected, and ten seconds have passed since
// your last connection, then connect again and send data:
if(!client.connected() && (millis() - lastConnectionTime > postingInterval))
// store the state of the connection for next time through
// the loop:
lastConnected = client.connected();

// this method makes a HTTP connection to the server:
void httpRequest() {

// if there’s a successful connection:
if (client.connect(server, 8083)) {
digitalWrite(ledPin, HIGH);
// send the HTTP PUT request:
//client.println(“GET /latest.txt HTTP/1.1”);
client.print(“GET /arduino/test.php?rfid=”);


//client.println(“User-Agent: arduino-ethernet”);
client.println(“Connection: close”);

// note the time that the connection was made:
lastConnectionTime = millis();
else {
// if you couldn’t make a connection:
Serial.println(“connection failed”);
digitalWrite(ledPin, LOW);

   readString[bufindex] = c;

It would be a good idea to make sure that there is room, before adding the character. It would be a good idea to keep the buffer NULL terminated, too.

    // send the HTTP PUT request:
    //client.println("GET /latest.txt HTTP/1.1");
    client.print("GET /arduino/test.php?rfid=");

If you are going to have comments that state the obvious, it's a good idea to make them do so correctly.

Is there a relationship between slow response times and load on your network? Is there a relationship between slow response times and load on your server?