"No Socket Available" - Wifi Shield on Arduino - sockets

Question

I have an LDR/Photocell which sends a value 1 or 0 (depending on the value) to a text file on my web address. The code works for a few seconds then prints out No Socket available.
Any help will be appreciated; code below.
#include <SPI.h>
#include <WiFi.h>
int LDR = A0;
int LED = 11;
char ssid[] = "SSID";
char password[] = "password";
int status = WL_IDLE_STATUS;
char server[] = "www.example.com";
int value;
void setup() {
Serial.begin(9600);
pinMode(LDR, INPUT);
pinMode(LED, OUTPUT);
connectWifi();
printWifiStatus();
// postData();
}
void loop() {
value = analogRead(LDR);
postData();
delay(10000);
}
void connectWifi() {
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to ");
Serial.println(ssid);
status = WiFi.begin(ssid, password);
delay(500);
}
}
void printWifiStatus() {
// Print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// Print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// Print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
void postData() {
WiFiClient client;
if (client.connect(server, 80)) {
Serial.println("Connecting...");
if (value > 350) {
Serial.println("0");
digitalWrite(LED, LOW);
String data = "value=0";
client.print("GET /example/client.php?");
client.print(data);
client.println(" HTTP/1.1");
client.println("Host: www.example.com");
client.println("Connection: close");
client.println(); client.println();
//client.stop();
} else {
Serial.println("1");
digitalWrite(LED, HIGH);
String data = "value=1";
client.print("GET /example/client.php?");
client.print(data);
client.println(" HTTP/1.1");
client.println("Host: www.example.com");
client.println("Connection: close");
client.println(); client.println();
//client.stop();
}
} else {
Serial.println("Connection failed");
client.stop();
}
}
Output:
Attempting to connect to SSID
SSID: SSID
IP Address: 255.255.255.255
signal strength (RSSI):-47 dBm
Connecting...
1
Connecting...
0
Connecting...
0
Connecting...
0
No Socket available
Connection failed
No Socket available
Connection failed
No Socket available
Connection failed
No Socket available
Actual web address omitted.

Answer 1

first of all, try not use "delay()" and your are calling this function "postData()" every 0,5 seconds. Try use the millis() function to do the timer thing, like this:
unsigned long timerBefore = 0;
const int timer = 1000; //1 second
now inside your loop()
unsigned long timerNow=millis();
if((unsigned long)(timerNow-timerBefore)>=timer){
postData();
timerBefore=millis();
}
that code i'll not "pause" your microcontroller and will call that function every one second.