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+/*
+ GSM Twitter Client with Strings
+
+ This sketch connects to Twitter using an Arduino GSM shield.
+ It parses the XML returned, and looks for the string <text>this is a tweet</text>
+
+ This example uses the String library, which is part of the Arduino core from
+ version 0019.
+
+ Circuit:
+ * GSM shield attached to an Arduino
+ * SIM card with a data plan
+
+ created 8 Mar 2012
+ by Tom Igoe
+
+ http://arduino.cc/en/Tutorial/GSMExamplesTwitterClient
+
+ This code is in the public domain.
+
+ */
+
+// libraries
+#include <GSM.h>
+
+// PIN Number
+#define PINNUMBER ""
+
+// APN data
+#define GPRS_APN "APN" // replace your GPRS APN
+#define GPRS_LOGIN "LOGIN" // replace with your GPRS login
+#define GPRS_PASSWORD "PASSWORD" // replace with your GPRS password
+
+// initialize the library instance
+GSMClient client;
+GPRS gprs;
+GSM gsmAccess;
+
+const unsigned long requestInterval = 30*1000; // delay between requests: 30 seconds
+
+// API Twitter URL
+char server[] = "api.twitter.com";
+
+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 communications and wait for port to open:
+ Serial.begin(9600);
+ while (!Serial) {
+ ; // wait for serial port to connect. Needed for Leonardo only
+ }
+
+ // connection state
+ boolean notConnected = true;
+
+ // After starting the modem with GSM.begin()
+ // attach the shield to the GPRS network with the APN, login and password
+ while(notConnected)
+ {
+ if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
+ (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
+ notConnected = false;
+ else
+ {
+ Serial.println("Not connected");
+ delay(1000);
+ }
+ }
+
+ Serial.println("Connected to GPRS network");
+
+ Serial.println("connecting...");
+ connectToServer();
+}
+
+
+
+void loop()
+{
+ char c;
+ 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 = "";
+ }
+
+ // 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();
+ }
+}
+
+/*
+ Connect to API Twitter server and do a request for timeline
+*/
+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&count=1 HTTP/1.1");
+ client.println("HOST: api.twitter.com");
+ client.println();
+ }
+ // note the time of this connect attempt:
+ lastAttemptTime = millis();
+}