hello,
i'm working 2 weeks with the ARduino ethernet and Arduino 1.0 IDE.
I'm experimenting some problems using HTTP connections.
It is very extrange, because this problems depends of the place i connect to internet. I mean the internet connection. I try in 3 diferents connections:
Fiber optic very good connection: No problems!
ADSL 10Mb normal connection: 15% errors
3G connection: 25% errors
I started to work with TwitterClient and in the begining i has a lot of problems with two much connections. After 5 connection client.connect(serverName, 80) not work, so i think we are in the limit of socket (4). I resolve this put another client.stop() and client.flush() after to call connectToserver() .
After this i experiment a lot of error in connections...
is like client.Available() not receive nothing!
Is there any timer or something? because this works very good in fiber optic connection to internet.
Then I suspect that might be the server's response time... some times works good and some times works very bad.
What do you think?
Any ideas?
This is cophy of terminal debug. You can see the are some connetions without request.
connecting to server...
making HTTP request...
>@RoxyHorror meet @tigoe you guys share the love for rollerderby :)
connecting to server...
making HTTP request...
connecting to server...
making HTTP request...
>@RoxyHorror meet @tigoe you guys share the love for rollerderby :)
connecting to server...
making HTTP request...
>@RoxyHorror meet @tigoe you guys share the love for rollerderby :)
connecting to server...
making HTTP request...
connecting to server...
making HTTP request...
>@RoxyHorror meet @tigoe you guys share the love for rollerderby :)
And this is the firmware with the small modification:
/*
Twitter Client with Strings
This sketch connects to Twitter using an Ethernet shield. It parses the XML
returned, and looks for <text>this is a tweet</text>
You can use the Arduino Ethernet shield, or the Adafruit Ethernet shield,
either one will work, as long as it's got a Wiznet Ethernet module on board.
This example uses the DHCP routines in the Ethernet library which is part of the
Arduino core from version 1.0 beta 1
This example uses the String library, which is part of the Arduino core from
version 0019.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
created 21 May 2011
by Tom Igoe
This code is in the public domain.
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x01 };
IPAddress ip(192,168,1,20);
// initialize the library instance:
EthernetClient client;
const int requestInterval = 20000; // delay between requests
char serverName[] = "api.twitter.com"; // twitter URL
boolean requested; // whether you've made a request since connecting
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:
Serial.begin(9600);
// attempt a DHCP connection:
if (!Ethernet.begin(mac)) {
// if DHCP fails, start with a hard-coded address:
Ethernet.begin(mac, ip);
}
// connect to Twitter:
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 = "";
}
// 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:
client.flush();
client.stop();
connectToServer();
}
}
void connectToServer() {
// attempt to connect, and wait a millisecond:
Serial.println("connecting to server...");
if (client.connect(serverName, 80)) {
Serial.println("making HTTP request...");
// make HTTP GET request to twitter:
client.println("GET /1/statuses/user_timeline.xml?user=arduino&count=1 HTTP/1.1");
client.println("HOST: api.twitter.com");
client.println();
}
// note the time of this connect attempt:
lastAttemptTime = millis();
}