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+/*
+ Wifi 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 23 apr 2012
+ modified 31 May 2012
+ by Tom Igoe
+
+ This code is in the public domain.
+
+ */
+#include <SPI.h>
+#include <WiFi.h>
+
+char ssid[] = "yourNetwork"; // your network SSID (name)
+char pass[] = "password"; // 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; // status of the wifi connection
+
+// initialize the library instance:
+WiFiClient client;
+
+const unsigned long requestInterval = 30*1000; // delay between requests; 30 seconds
+
+// if you don't want to use DNS (and reduce your sketch size)
+// use the numeric IP instead of the name for the server:
+//IPAddress server(199,59,149,200); // numeric IP for api.twitter.com
+char server[] = "api.twitter.com"; // name address for twitter API
+
+boolean requested; // whether you've made a request since connecting
+unsigned long lastAttemptTime = 0; // last time you connected to the server, in milliseconds
+
+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 and wait for port to open:
+ Serial.begin(9600);
+ while (!Serial) {
+ ; // wait for serial port to connect. Needed for Leonardo only
+ }
+
+ // check for the presence of the shield:
+ if (WiFi.status() == WL_NO_SHIELD) {
+ Serial.println("WiFi shield not present");
+ // don't continue:
+ while(true);
+ }
+
+ // attempt to connect to Wifi network:
+ while ( status != WL_CONNECTED) {
+ Serial.print("Attempting to connect to SSID: ");
+ Serial.println(ssid);
+ // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+ status = WiFi.begin(ssid, pass);
+
+ // wait 10 seconds for connection:
+ delay(10000);
+ }
+ // you're connected now, so print out the status:
+ printWifiStatus();
+ connectToServer();
+}
+
+void loop()
+{
+ if (client.connected()) {
+ 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') {
+ 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 = "";
+ // break out of the loop so this character isn't added to the tweet:
+ return;
+ }
+ // 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() - lastAttemptTime > requestInterval) {
+ // 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:
+ client.println("GET /1/statuses/user_timeline.xml?screen_name=arduino HTTP/1.1");
+ client.println("Host:api.twitter.com");
+ client.println("Connection:close");
+ client.println();
+ }
+ // note the time of this connect attempt:
+ lastAttemptTime = millis();
+}
+
+
+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");
+}
+
+
+
+