Twitter via WiFly

Using Arduino Programming Questions
1

Hello,

I've been trying to get my arduino to tweet over wifi. I have the WiFly shield set up from sparkfun which is working, but I haven't been able to successfully send tweets over it. As far as I can tell, the twitter libraries (I've been looking at http://arduino-tweet.appspot.com/) are set up to work with the ethernet shield.

Has anyone managed to send a tweet via wifi?

Best,
Matt

2

I haven't had any use for twitter, but...

but I haven't been able to successfully send tweets over it.

Using what code? What happens?

3

I haven't been able to port the library (code doesn't compile). I'm not entirely sure I'm up to porting the twitter library to work with the WiFly library unfortunately. I was wondering if any had done it at some point and maybe never shared it online. :slight_smile:

4

It shouldn't be that difficult to port. Post the code that generates the errors, and the errors it generates.

5

Remove under two line in the your sketch and Twitter.h
-#include <Ethernet.h>
-#include <EthernetDNS.h>

and
in the Twitter.cpp, comment out below code.
DNSError err = EthernetDNS.resolveHostName(LIB_DOMAIN, server);
if (err != DNSSuccess) {
return false;
}
and you need to hardcode for "arduino-tweet.appspot.com"
-static uint8_t server[] = {0,0,0,0}; // IP address of LIB_DOMAIN
+static uint8_t server[] = {74,125,127,141}; // IP address of LIB_DOMAIN

6

All you really need to do is something like this.

#include <SPI.h>
#include <SC16IS750.h>
#include <WiFly.h>
#include "Credentials.h"


char token[] = "YOUR TOKEN HERE"; //@normbot
char msg[140];


char url[] = "arduino-tweet.appspot.com";
int hour = 3600000;

WiFlyClient client( url, 80 );

void setup() {

  Serial.begin(9600);
  SC16IS750.begin();

  WiFly.setUart(&SC16IS750);
  WiFly.begin();

  if (WiFly.join(ssid, passphrase)) {
    Serial.print("Associated with ");
    Serial.println(ssid);
  }
  else {
    Serial.println("Association failed.");
    while (1) {
      // Hang on failure.
    }
  }  

}

void loop() {
  Serial.print("connecting to ");
  Serial.println( url);
  String starDate( millis());
  String startOfMsg("Normbot Log: Stardate " + starDate);
  String fullMsg( startOfMsg + ". Still no sign of WD40" );
  for ( int i = 0; i < sizeof( msg ); i++ ) {
    msg[i] = '\0';
  }
  fullMsg.toCharArray( msg, fullMsg.length() + 1 );
   

  if (client.connect()) {
    Serial.println("connected");
    client.println("POST http://arduino-tweet.appspot.com/update HTTP/1.0");
    client.print("Content-Length: ");
    client.println(strlen(msg)+strlen(token)+14);
    client.println();
    client.print("token=");
    client.print(token);
    client.print("&status=");
    client.println(msg);
  } 
  else {
    Serial.println("connection failed");
  }
 
  if ( client.available()) {
    char c = client.read();
    Serial.print(c);
  }
  

  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
  }
  delay(600000);
}

It's not perfect - I cobbled the code together as a proof of concept. I will work on porting the Twitter library to WiFly when I get more time. The code above works though.