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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();
}
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