Added Twitter client (in progress, not working)

WiFi/examples/TwitterClient/TwitterClient.ino

@@ -0,0 +1,199 @@
+/*
+  Twitter Client with Strings
+ 
+ This sketch connects to Twitter using using an Arduino WiFi shield. 
+ It parses the XML returned, and looks for <text>this is a tweet</text>
+ 
+ This example is written for a network using WPA encryption. For 
+ WEP or WPA, change the Wifi.begin() call accordingly.
+ 
+ This example uses the String library, which is part of the Arduino core from
+ version 0019.  
+ 
+ Circuit:
+ * WiFi shield attached to pins 10, 11, 12, 13
+ 
+ created 15 Sep 2011
+ modified 2 Mar 2012
+ by Tom Igoe
+ 
+ This code is in the public domain.
+ 
+ */
+#include <SPI.h>
+#include <WiFi.h>
+
+char ssid[] = "itpsandbox";      //  your network SSID (name) 
+char pass[] = "NYU+s0a!+P?";   // your network password (use for WPA, or use as key for WEP)
+int keyIndex = 0;                 // your network key Index number (needed only for WEP)
+
+int status = WL_IDLE_STATUS;
+
+// initialize the library instance:
+WiFiClient client;
+
+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 
+//char server[] = "api.twitter.com";
+IPAddress server(199,59,148,20);
+//IPAddress server(128,122,151,128);
+
+String currentLine = "";               // string to hold the text from server
+String tweet = "";                     // string to hold the tweet
+boolean readingTweet = false;          // if you're currently reading the tweet
+
+void setup() {
+  // reserve space for the strings:
+  currentLine.reserve(256);
+  tweet.reserve(150);
+  // initialize serial:
+  Serial.begin(9600);
+  Serial.println("Attempting to connect to WPA network...");
+  Serial.print("SSID: ");
+  Serial.println(ssid);
+
+  status = WiFi.begin(ssid, pass);
+  while ( status != WL_CONNECTED) { 
+      status = WiFi.begin(ssid, pass);
+    Serial.println("Couldn't get a wifi connection");
+    delay(5000);
+  } 
+    Serial.println("Connected to wifi");
+    printWifiData();
+    printCurrentNet();
+    connectToServer();
+}
+
+
+
+void loop()
+{
+  if (client.connected()) {
+    Serial.println("requested");
+    if (client.available()) {
+      // read incoming bytes:
+      char inChar = client.read();
+      
+      // add incoming byte to end of line:
+      currentLine += inChar; 
+
+      // if you get a newline, clear the line:
+      if (inChar == '\n') {
+        Serial.println(currentLine);
+        currentLine = "";
+      } 
+      // if the current line ends with <text>, it will
+      // be followed by the tweet:
+      if ( currentLine.endsWith("<text>")) {
+        // tweet is beginning. Clear the tweet string:
+        readingTweet = true; 
+        tweet = "";
+      }
+      // if you're currently reading the bytes of a tweet,
+      // add them to the tweet String:
+      if (readingTweet) {
+        if (inChar != '<') {
+          tweet += inChar;
+        } 
+        else {
+          // if you got a "<" character,
+          // you've reached the end of the tweet:
+          readingTweet = false;
+          Serial.println(tweet);   
+          // close the connection to the server:
+          client.stop(); 
+        }
+      }
+    }   
+  }
+  else if (millis() - lastConnectionTime > postingInterval) {
+    // if you're not connected, and two minutes have passed since
+    // your last connection, then attempt to connect again:
+    connectToServer();
+  }
+}
+
+void connectToServer() {
+  // attempt to connect, and wait a millisecond:
+  Serial.println("connecting to server...");
+  if (client.connect(server, 80)) {
+    Serial.println("making HTTP request...");
+    // make HTTP GET request to twitter:
+    delay(10);
+    client.print("GET /1/statuses/user_timeline.xml?screen_name=arduino&count=1 HTTP/1.1\n");
+    client.print("Host:api.twitter.com\n");
+      client.print("Connection:close\n\n");
+   // client.println();
+  }
+  else {
+    // if you couldn't make a connection:
+    Serial.println("connection failed");
+    Serial.println();
+    Serial.println("disconnecting.");
+    client.stop();
+  }
+  // note the time of this connect attempt:
+  lastConnectionTime = millis();
+  lastConnected = client.connected();
+}   
+
+
+void printWifiData() {
+  // print your WiFi shield's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+  
+  // print your MAC address:
+  byte mac[6];  
+  WiFi.macAddress(mac);
+  Serial.print("MAC address: ");
+  Serial.print(mac[5],HEX);
+  Serial.print(":");
+  Serial.print(mac[4],HEX);
+  Serial.print(":");
+  Serial.print(mac[3],HEX);
+  Serial.print(":");
+  Serial.print(mac[2],HEX);
+  Serial.print(":");
+  Serial.print(mac[1],HEX);
+  Serial.print(":");
+  Serial.println(mac[0],HEX);
+ 
+}
+
+void printCurrentNet() {
+  // print the SSID of the network you're attached to:
+  Serial.print("SSID: ");
+  Serial.println(WiFi.SSID());
+
+  // print the MAC address of the router you're attached to:
+  byte bssid[6];
+  WiFi.BSSID(bssid);    
+  Serial.print("BSSID: ");
+  Serial.print(bssid[5],HEX);
+  Serial.print(":");
+  Serial.print(bssid[4],HEX);
+  Serial.print(":");
+  Serial.print(bssid[3],HEX);
+  Serial.print(":");
+  Serial.print(bssid[2],HEX);
+  Serial.print(":");
+  Serial.print(bssid[1],HEX);
+  Serial.print(":");
+  Serial.println(bssid[0],HEX);
+
+  // print the received signal strength:
+  long rssi = WiFi.RSSI();
+  Serial.print("signal strength (RSSI):");
+  Serial.println(rssi);
+
+  // print the encryption type:
+  byte encryption = WiFi.encryptionType();
+  Serial.print("Encryption Type:");
+  Serial.println(encryption,HEX);
+  Serial.println();
+}
+
+