Friday, 1 January 2016

Galileo-Link : Connect THINGS to Social Network

Hello people!The following project is a basic implementation of what can later give rise to a dedicated social network for sensors. Have you ever wondered how would it be if all your inanimate things can talk on social network like Facebook, twitter? Green-house updating it’s health on it’s timeline? This project is an effort to give social life to the “things”.

I have implemented the project using Intel Galileo board as the sensor gateway, you can use any other board running Linux OS with python installed. I tried making my home talk. That is, posting sensors data installed on Intel Galileo kept in my room to the Facebook account by name “Galileo Link” wall. So all we need is access to Facebook Graph API and a python script.

To access the Graph API, we need to create a Facebook App on facebook developers page. Now follow these steps:
1. Click Add a New App -> Choose platform WWW -> Choose a new name for your app -> Click Create New Facebook App ID -> Create a New App ID -> Choose Category -> Click Create App ID again.

2.Go back to Apps Dashboard -> Select the new app -> Settings -> Basic -> Enter Contact Email.

3.Go to Status & Review -> Do you want to make this app and all its live features available to the general public? -> Toggle the button to Yes -> Make App Public? -> Yes. This will enable others to see posts by your app in their timelines – otherwise, only you will see the wall posts by the app.

4.Now – you should see a green dot next to app’s name, and the text This app is public and available to all users.

5.Make a note of the App ID and App Secret (Click Show next to it; you will be asked to re-enter your Facebook password). Now that the app has been created, the next step is to get Facebook OAuth Token.

Steps to get Facebook OAuth Token :

1.Go to Graph API Explorer-> In the Application drop down -> Select the app created -> Click Get Access Token -> In Permissions popup go to Extended Permissions tab -> Select manage_pages, andpublish_actions These permissions will allow your app to publish posts acting as the page -> Click Get Access Token -> You will see a message saying “{App} would like to post publicly to Facebook for you. Who do you want to share these posts with?” -> I chose Public for maximum visibility – as I wanted to post to a public page.

2.Make a note of the short-lived token shown in Graph API Explorer.

3.Facebook has deprecated offline access, the next best thing is long-lived token which expires in 60 days. We will convert the short-lived access token noted above to a long-lived token. For that, fill in the values in the URL below and open it in a browser:


Replace the values in {}.

4.You should see access_token={...}&expires={...}. This new access_token is the long-lived token we will use in our Python script.

5.long-lived token will also expire eventually, be prepared to perform this Step 3 again before that happens!

6.We will use Facebook Python SDK to access Facebook’s Graph API. You can install it using pip: pip install facebook-sdk.

NOTE : Some might get AttributeError: ‘module’ object has no attribute ‘GraphAPI’ . This maybe because of bad installation or corrupt packages. Other facebook packages may have been installed and it might be a possibility that the python script is importing from wrong path.
You might want to go to those directories where Facebook instances are installed. To know the directory. create a python script :

import facebook
print facebook.__path__

The path to the facebook will be displayed.Go to the directory delete facebook packages and then re-install it again.Problem solved!

Now the next important thing is the page ID which can be found in About tab of the Facebook account (usually it is a big number). Finally the code on Intel Galileo will post to Facebook wall of the Account.
Follow this link to my github and find the python script for this project.
Here is the link to my Galileo-Link!
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