Added Repeating Web Client example

Tom Igoe · Tom Igoe · commit e8118e227055 · 2012-04-23T11:26:27.000-04:00
diff --git a/WiFi/examples/WifiWebClientRepeating/WifiWebClientRepeating.ino b/WiFi/examples/WifiWebClientRepeating/WifiWebClientRepeating.ino
@@ -0,0 +1,128 @@
+/*
+  Repeating Wifi Web client
+ 
+ This sketch connects to a a web server and makes a request
+ using an Arduino Wifi shield.
+ 
+ Circuit:
+ * Wifi shield attached to pins 10, 11, 12, 13
+ 
+ created 23 Apr 2012
+ by Tom Igoe
+ 
+ http://arduino.cc/en/Tutorial/WifiWebClientRepeating
+ This code is in the public domain.
+ */
+
+#include <SPI.h>
+#include <WiFi.h>
+
+char ssid[] = "yourNetwork";      //  your network SSID (name) 
+char pass[] = "secretPassword";   // your network password
+int keyIndex = 0;            // your network key Index number (needed only for WEP)
+
+int status = WL_IDLE_STATUS;
+
+// Initialize the Wifi client library
+WiFiClient client;
+
+// server address:
+char server[] = "www.arduino.cc";
+//IPAddress server(64,131,82,241);
+
+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
+
+void setup() {
+  // start serial port:
+  Serial.begin(9600);
+  
+  // attempt to connect to Wifi network:
+  while ( status != WL_CONNECTED) { 
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    status = WiFi.begin(ssid, pass);
+    // wait 10 seconds for connection:
+    delay(10000);
+  } 
+  // you're connected now, so print out the status:
+  printWifiStatus();
+  // print the Wifi board/shield's IP address:
+  Serial.print("My IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  // if there's incoming data from the net connection.
+  // send it out the serial port.  This is for debugging
+  // purposes only:
+  while (client.available()) {
+    char c = client.read();
+    Serial.write(c);
+  }
+
+  // if there's no net connection, but there was one last time
+  // through the loop, then stop the client:
+  if (!client.connected() && lastConnected) {
+    Serial.println();
+    Serial.println("disconnecting.");
+    client.stop();
+  }
+
+  // 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)) {
+    httpRequest();
+  }
+  // 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, 80)) {
+    Serial.println("connecting...");
+    // send the HTTP PUT request:
+    client.println("GET /latest.txt HTTP/1.1");
+    client.println("Host: www.arduino.cc");
+    client.println("User-Agent: arduino-ethernet");
+    client.println("Connection: close");
+    client.println();
+
+    // note the time that the connection was made:
+    lastConnectionTime = millis();
+  } 
+  else {
+    // if you couldn't make a connection:
+    Serial.println("connection failed");
+    Serial.println("disconnecting.");
+    client.stop();
+  }
+}
+
+
+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");
+}
+
+
+
+
+
+
