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Topic: Problems implementing Twitter's API v1.1 using OAuth on Arduino (Read 3583 times) previous topic - next topic

Feb 18, 2013, 07:02 pm Last Edit: Feb 21, 2013, 12:46 pm by G3RMiCH Reason: 1

I'm using an Arduino Uno board with the Ethernet Shield to get the last tweet (of Twitter) from a public user timeline (it's mine) and display it on the Arduino serial monitor. I want the whole device to work without Python or Ruby and as it's a stand alone project it won't be used with a computer.
I create a client that connects to api.twitter.com and I use this GET command of the REST API v1.0 to obtain it:

Code: [Select]

client.print("GET /1/statuses/user_timeline.json?&screen_name=tuitduino&count=1 HTTP/1.1");
client.println("HOST: api.twitter.com");

It works properly, but according to the Twitter's API documentation (https://dev.twitter.com/docs/api/1.1/get/statuses/user_timeline), I must change my GET command to the new version 1.1. This is what I do:

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client.print("GET /1.1/statuses/user_timeline.json?&screen_name=tuitduino&count=1 HTTP/1.1");
client.println("HOST: api.twitter.com");

but it doesn't work. According to the Twitter's API documentation, I must use OAuth to access this information, that is, to authenticate and authorize an aplication, wich I must create (in my case I suppose that it have to be a website), to read or write tweets from a user account (mine's) on behalf of it. The problem is that I don't know how to integrate the GET HTTP request and the OAuth information with my Arduino code. I've seen the Twitter's API documentation in depth and there are a few examples and libraries to do it "easily" but they are written for other programming languages, not for Arduino.
According to the documentation, I must implement a header, something like this:


Authorization: OAuth oauth_consumer_key="cCB46H0y6R8Hrx836WwAA", oauth_nonce="18106fa9ce0b1083367cfbd50720abea", oauth_signature="XXXXXXXXXXXXXXXXXXXXXXX", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1361444134", oauth_token="1004705586-tF4876Qu6qTwLMuTaCjbZCLTbFt4hDoRoCun3qW", oauth_version="1.0"

where the alphanumeric values are given to me from Twitter and XXXXXXXXXXXXXXXXXXXXXXX is a private value so I omitted it.

Does anybody has some idea to do it with Arduino? The GET method and the header. It's very important for me because it's for my final project.



I have a fully functional setup you're describing on the Raspberry Pi. Here's a link to a demo video of it working :http://vimeo.com/61256196

Email me at: danbertner(@)gmail(dot).com if you need help and want to go in this direction.


It's the two newlines in a row that signals the end of headers:
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client.println("HOST: api.twitter.com");

To add more headers, change the first .println() to .print() and add a new .println() after your headers:
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client.print(F("GET /1/statuses/user_timeline.json?&screen_name=tuitduino&count=1 HTTP/1.1"));
client.print(F("HOST: api.twitter.com"));
client.print(F("Authorization: OAuth oauth_consumer_key=\"cCB46H0y6R8Hrx836WwAA\", oauth_nonce=\"18106fa9ce0b1083367cfbd50720abea\", oauth_signature=\"XXXXXXXXXXXXXXXXXXXXXXX\", oauth_signature_method=\"HMAC-SHA1\", oauth_timestamp=\"1361444134\", oauth_token=\"1004705586-tF4876Qu6qTwLMuTaCjbZCLTbFt4hDoRoCun3qW\", oauth_version=\"1.0\""));

Also note the use of backslash to put quote characters inside a string constant.

Also not the use of the F() macro to keep those long string constants from taking up room in precious SRAM.
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i need to know how to coleck the parameters that you use in this code( autorization header);increasingly have to take those from the page developers twitter; ther is an important note ( in api page of twitter); OAuth signing results
Important: This will only be valid for a few minutes. Also remember the cURL command will actually execute the request.

so have you try realy the code on this example( i did but it doesn`t work, i had no reponse):
making HTTP request...
HTTP/1.1 400 Bad Request
Content-Length: 0
Connection: close
when i use :   client.print(F("GET /1.1/statuses/user_timeline.json?screen_name=plantaexpre&count=1 HTTP/1.1"));
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    client.print(F("Authorization: OAuth oauth_consumer_key=\"j3UCRhGsBZSfRltac4zEXg\", oauth_nonce=\"XXXXXXXXXXXXXXXXXXXXXXX\", oauth_signature=\"XXXXXXXXXXXXXXXXXXXXXX\", oauth_signature_method=\"HMAC-SHA1\", oauth_timestamp=\"1364306703\", oauth_token=\"*********************************************\", oauth_version=\"1.0\""));

have you try this code with anther  Twitter APi v1.1 ???


You are not sending a cr/lf with those. Use client.println() instead of .print().
when i use :   client.print(F("GET /1.1/statuses/user_timeline.json?screen_name=plantaexpre&count=1 HTTP/1.1"));

This is how the server sees your request, and this would be bad.
Code: [Select]
GET /1.1/statuses/user_timeline.json?screen_name=plantaexpre&count=1 HTTP/1.1Host:api.twitter.comAuthorization: OAuth oauth_consumer_key="j3UCRhGsBZSfRltac4zEXg", oauth_nonce="XXXXXXXXXXXXXXXXXXXXXXX", oauth_signature="XXXXXXXXXXXXXXXXXXXXXX", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1364306703", oauth_token="*********************************************", oauth_version="1.0"



thanks for the note
i have try with println() and the reponse was the error 404 that means : the requested format is not supported by the requested method.

so ther is some help to use API v1.1 with the oauth

┬┐should i use a library for the authentication?
and how can i get nonce parametre and signature, because the values from twitter developers page  will only be valid for a few minutes?
my application should connect automatically; but with this methode i will give the application (in the arduino scketh) all the parametres it need, and the nonce parameters is only for a unique access..
any help please.

ther is another post for oauth http://arduino.cc/forum/index.php/topic,156599.0.html


Error 404 means "file not found". According to your code, this one:

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