EtherCard ether.browesUrl don't work when use Delay() with big number

Projects Networking, Protocols, and Devices
1

Hi, I have problem with ethercard library and Ethernet module ENC28J60. Problem is with delay() function.
With delay(1000) it works fine and I see request in "/var/log/apache2/access.log" on server. When I set longer delay(), for example 10 seconds - delay(10000) server don't receive any requests.
I found similar question, but it is not helpful for me :frowning:

There is my code:

#include <EtherCard.h>

static byte mymac[] = { 0x00, 0x00, 0x6C, 0x01, 0x02, 0x03 };
char website[] PROGMEM = "server.lan";

byte Ethernet::buffer[1000];
static uint32_t timer; // http://mbed.org/handbook/C-Data-Types (0 .. 4,294,967,295)
const int inputButton1 = 5;
const int inputButton2 = 7;

static void response_callback (byte status, word off, word len) {  
  Serial.print((const char*) Ethernet::buffer + off + 207);
} 
 
void setup () { 
  Serial.begin(9600);
 
  if (ether.begin(sizeof Ethernet::buffer, mymac) == 0) 
    Serial.println( "Failed to access Ethernet controller");

  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");

  ether.printIp("IP:       ", ether.myip);
  ether.printIp("Netmask:  ", ether.mymask);
  ether.printIp("GW:       ", ether.gwip);  
  ether.printIp("DNS:      ", ether.dnsip); 

  if (!ether.dnsLookup(website))
    Serial.println("DNS failed");
  else 
    Serial.println("DNS resolution done");  
  ether.printIp("SRV IP:   ", ether.hisip);
  Serial.println();
  
  pinMode(inputButton1, INPUT);
  pinMode(inputButton2, INPUT);
  Serial.println("END SETUP");
}
 
void loop() {
  delay(10000);
  
  int buttonState1 = digitalRead(inputButton1);
  int buttonState2 = digitalRead(inputButton1);
  
  String stringData = String(50);
  
  stringData = "?button1=";
  if (digitalRead(inputButton1) == HIGH) 
    stringData += "ON";
  else
    stringData += "OFF";
 
  stringData += "&button2=";
  if (digitalRead(inputButton2) == HIGH) 
    stringData += "ON";
  else
    stringData += "OFF";
  
  char stringToSend[50];
  stringData.toCharArray(stringToSend, 50);
  Serial.println(stringToSend);
 
  ether.packetLoop(ether.packetReceive());
  
  if (millis() > timer) {
    timer = millis() + 5000;
    ether.browseUrl(PSTR("/arduino.php/"), stringToSend, website, response_callback);
  }
}

Thank you for help.

2

delay is blocking all code, an Arduino is not multithreading,

please have a look at the blink without delay example how to do timed actions.
(Ethernet is not as simple as a LED but the idea is the same)

3 
  String stringData = String(50);

Do you know what this is doing? If not, learn. Print stringData immediately after this statement.

If you do know what it is doing, explain why you are not simply using:

String stringData = "50";