Hey Everyone,
We are currently trying to filter some information from the JSON dump produced by a sketch that searches twitter. Our sketch is based on a temboo choreo (not sure if this is a dirty topic or not).
We have been messing around with two different choreos. The first one prints the most recent tweet from a specific accounts timeline:
/*
ReadATweet
Demonstrates retrieving the most recent Tweet from a user's home timeline
using the Temboo Arduino Yun SDK.
This example code is in the public domain.
*/
#include <Bridge.h>
#include <Temboo.h>
#include "TembooAccount.h" // contains Temboo account information
/*** SUBSTITUTE YOUR VALUES BELOW: ***/
// Note that for additional security and reusability, you could
// use #define statements to specify these values in a .h file.
const String TWITTER_ACCESS_TOKEN = "your-twitter-access-token";
const String TWITTER_ACCESS_TOKEN_SECRET = "your-twitter-access-token-secret";
const String TWITTER_API_KEY = "your-twitter-api-key";
const String TWITTER_API_SECRET = "your-twitter-api-secret";
int numRuns = 1; // execution count, so this doesn't run forever
int maxRuns = 10; // the max number of times the Twitter HomeTimeline Choreo should run
void setup() {
Serial.begin(9600);
// For debugging, wait until a serial console is connected.
delay(4000);
while(!Serial);
Bridge.begin();
}
void loop()
{
// while we haven't reached the max number of runs...
if (numRuns <= maxRuns) {
Serial.println("Running ReadATweet - Run #" + String(numRuns++));
TembooChoreo HomeTimelineChoreo;
// invoke the Temboo client.
// NOTE that the client must be reinvoked, and repopulated with
// appropriate arguments, each time its run() method is called.
HomeTimelineChoreo.begin();
// set Temboo account credentials
HomeTimelineChoreo.setAccountName(TEMBOO_ACCOUNT);
HomeTimelineChoreo.setAppKeyName(TEMBOO_APP_KEY_NAME);
HomeTimelineChoreo.setAppKey(TEMBOO_APP_KEY);
// tell the Temboo client which Choreo to run (Twitter > Timelines > HomeTimeline)
HomeTimelineChoreo.setChoreo("/Library/Twitter/Timelines/HomeTimeline");
// set the required choreo inputs
// see https://www.temboo.com/library/Library/Twitter/Timelines/HomeTimeline/
// for complete details about the inputs for this Choreo
HomeTimelineChoreo.addInput("Count", "1"); // the max number of Tweets to return from each request
HomeTimelineChoreo.addInput("AccessToken", TWITTER_ACCESS_TOKEN);
HomeTimelineChoreo.addInput("AccessTokenSecret", TWITTER_ACCESS_TOKEN_SECRET);
HomeTimelineChoreo.addInput("ConsumerKey", TWITTER_API_KEY);
HomeTimelineChoreo.addInput("ConsumerSecret", TWITTER_API_SECRET);
// next, we'll define two output filters that let us specify the
// elements of the response from Twitter that we want to receive.
// see the examples at http://www.temboo.com/arduino
// for more on using output filters
// we want the text of the tweet
HomeTimelineChoreo.addOutputFilter("tweet", "/[1]/text", "Response");
// and the name of the author
HomeTimelineChoreo.addOutputFilter("author", "/[1]/user/screen_name", "Response");
// tell the Process to run and wait for the results. The
// return code will tell us whether the Temboo client
// was able to send our request to the Temboo servers
unsigned int returnCode = HomeTimelineChoreo.run();
// a response code of 0 means success; print the API response
if(returnCode == 0) {
String author; // a String to hold the tweet author's name
String tweet; // a String to hold the text of the tweet
// choreo outputs are returned as key/value pairs, delimited with
// newlines and record/field terminator characters, for example:
// Name1\n\x1F
// Value1\n\x1E
// Name2\n\x1F
// Value2\n\x1E
// see the examples at http://www.temboo.com/arduino for more details
// we can read this format into separate variables, as follows:
while(HomeTimelineChoreo.available()) {
// read the name of the output item
String name = HomeTimelineChoreo.readStringUntil('\x1F');
name.trim();
// read the value of the output item
String data = HomeTimelineChoreo.readStringUntil('\x1E');
data.trim();
// assign the value to the appropriate String
if (name == "tweet") {
tweet = data;
} else if (name == "author") {
author = data;
}
}
Serial.println("@" + author + " - " + tweet);
} else {
// there was an error
// print the raw output from the choreo
while(HomeTimelineChoreo.available()) {
char c = HomeTimelineChoreo.read();
Serial.print(c);
}
}
HomeTimelineChoreo.close();
}
Serial.println("Waiting...");
delay(90000); // wait 90 seconds between HomeTimeline calls
}
This prints a nice simple string into the serial monitor. Looking like this:
@Authors_name - tweet_content.
We then tried to use the code below to search twitter for a specific term and print it out in the same way. Here is the code:
#include <Bridge.h>
#include <Temboo.h>
#include "TembooAccount.h" // contains Temboo account information, as described below
int numRuns = 1; // Execution count, so this doesn't run forever
int maxRuns = 10; // Maximum number of times the Choreo should be executed
void setup() {
Serial.begin(9600);
// For debugging, wait until the serial console is connected.
delay(4000);
while(!Serial);
Bridge.begin();
}
void loop() {
if (numRuns <= maxRuns) {
Serial.println("Running Tweets - Run #" + String(numRuns++));
TembooChoreo TweetsChoreo;
// Invoke the Temboo client
TweetsChoreo.begin();
// Set Temboo account credentials
TweetsChoreo.setAccountName(TEMBOO_ACCOUNT);
TweetsChoreo.setAppKeyName(TEMBOO_APP_KEY_NAME);
TweetsChoreo.setAppKey(TEMBOO_APP_KEY);
// Set profile to use for execution
TweetsChoreo.setCredential("TwitterAccount2");
// Identify the Choreo to run
TweetsChoreo.setChoreo("/Library/Twitter/Search/Tweets");
// Run the Choreo; when results are available, print them to serial
TweetsChoreo.run();
while(TweetsChoreo.available()) {
char c = TweetsChoreo.read();
Serial.print(c);
}
TweetsChoreo.close();
}
Serial.println("Waiting...");
delay(30000); // wait 30 seconds between Tweets calls
}
This prints a whole load of meta data about the tweets it finds.
So we tried to use the filtering system from the home line choreo to produce the nice simple output.
The bit of code we tried to include:
TweetsChoreo.addOutputFilter("tweet", "/[1]/text", "Response");
TweetsChoreo.addOutputFilter("author", "/[1]/user/screen_name", "Response");
unsigned int returnCode = TweetsChoreo.run();
if(returnCode == 0) {
String author;
String tweet;
while(TweetsChoreo.available()) {
String name = TweetsChoreo.readStringUntil('\x1F');
name.trim();
String data = TweetsChoreo.readStringUntil('\x1E');
data.trim();
// assign the value to the appropriate String
if (name == "tweet") {
tweet = data;
} else if (name == "author") {
author = data;
With this section it compiles and runs fine with no errors. However, it prints a blank statment like this:
@ -
With no author name or tweet content.
We have spent a good while trying different things with no result and are starting to pull our hair out. I hope this all makes sense and thank you to anyone who has any suggestions!
EDIT: We are using the Arduino Yun!
