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130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
/*
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Twitter Client with Strings
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This sketch connects to Twitter using an Ethernet shield. It parses the XML
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returned, and looks for <text>this is a tweet</text>
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You can use the Arduino Ethernet shield, or the Adafruit Ethernet shield,
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either one will work, as long as it's got a Wiznet Ethernet module on board.
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This example uses the DHCP routines in the Ethernet library which is part of the
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Arduino core from version 1.0 beta 1
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This example uses the String library, which is part of the Arduino core from
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version 0019.
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Circuit:
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* Ethernet shield attached to pins 10, 11, 12, 13
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created 21 May 2011
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updates 2 Mar 2012
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by Tom Igoe
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This code is in the public domain.
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*/
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#include <SPI.h>
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#include <Ethernet.h>
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// Enter a MAC address and IP address for your controller below.
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// The IP address will be dependent on your local network:
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byte mac[] = {
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0xDE,0xAD,0xBE,0xEF,0xFE,0xED };
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IPAddress ip(192,168,1,20);
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// initialize the library instance:
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EthernetClient client;
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const unsigned long requestInterval = 60000; // delay between requests
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char serverName[] = "api.twitter.com"; // twitter URL
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boolean requested; // whether you've made a request since connecting
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unsigned long lastAttemptTime = 0; // last time you connected to the server, in milliseconds
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String currentLine = ""; // string to hold the text from server
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String tweet = ""; // string to hold the tweet
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boolean readingTweet = false; // if you're currently reading the tweet
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void setup() {
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// reserve space for the strings:
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currentLine.reserve(256);
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tweet.reserve(150);
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// initialize serial:
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Serial.begin(9600);
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// attempt a DHCP connection:
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Serial.println("Attempting to get an IP address using DHCP:");
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if (!Ethernet.begin(mac)) {
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Serial.println("failed to get an IP address using DHCP, trying manually");
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// if DHCP fails, start with a hard-coded address:
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Ethernet.begin(mac, ip);
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}
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Serial.print("My IP address:");
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Serial.println(ip);
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// connect to Twitter:
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connectToServer();
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}
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void loop()
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{
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if (client.connected()) {
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if (client.available()) {
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// read incoming bytes:
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char inChar = client.read();
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// add incoming byte to end of line:
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currentLine += inChar;
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// if you get a newline, clear the line:
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if (inChar == '\n') {
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currentLine = "";
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}
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// if the current line ends with <text>, it will
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// be followed by the tweet:
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if ( currentLine.endsWith("<text>")) {
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// tweet is beginning. Clear the tweet string:
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readingTweet = true;
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tweet = "";
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}
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// if you're currently reading the bytes of a tweet,
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// add them to the tweet String:
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if (readingTweet) {
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if (inChar != '<') {
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tweet += inChar;
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}
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else {
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// if you got a "<" character,
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// you've reached the end of the tweet:
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readingTweet = false;
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Serial.println(tweet);
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// close the connection to the server:
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client.stop();
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}
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}
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}
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}
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else if (millis() - lastAttemptTime > requestInterval) {
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// if you're not connected, and two minutes have passed since
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// your last connection, then attempt to connect again:
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connectToServer();
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}
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}
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void connectToServer() {
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// attempt to connect, and wait a millisecond:
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Serial.println("connecting to server...");
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if (client.connect(serverName, 80)) {
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Serial.println("making HTTP request...");
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// make HTTP GET request to twitter:
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client.println("GET /1/statuses/user_timeline.xml?screen_name=arduino&count=1 HTTP/1.1");
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client.println("HOST: api.twitter.com");
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client.println();
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}
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// note the time of this connect attempt:
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lastAttemptTime = millis();
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}
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