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banasrini/iotconnector.py

Created June 19, 2014 16:43
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<h1 class="blog-title">Making the Raspberry Pi talk PubNub's language</h1>
<p class="lead blog-description"><a href = "/Users/bhavana/Desktop/bootstrap/cover.html">IoT-PubNub-Embedded Devices </a></p>
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<p class="blog-post-meta">June 7, 2014 by <a href="#">Bhavana</a></p>
<p>With all the buzz surrounding IoT, its only natural for us at PubNub to dive right into it.
With over two hundred million connected devices connected to our global realtime network in fourteen data centers,
we average 50 to 60 thousands transactions per second, peaking at over 3 million. PubNub has its foot in the automative
industry, home automation and IoT wearables.</p>
<hr>
<p>The <a href = "http://www.raspberrypi.org">Raspberry Pi</a>, is a fully functional mini-computer, and is a cheap
solution for harnessing the Internet of Things. It include plenty of inputs and outputs for sensory add-ons
to test light, temperature, humidity and more.
</p>
<p> This post walks you through the steps of connecting a Raspberry Pi to the PubNub network. This way you can now connect
with
a million other devices on this global network and start sending or receiving information to and from the Pi.
<hr>
PubNub provides
extensive documentation and support for the Raspberry Pi <a href = "http://www.pubnub.com/documentation/">here </a>. Once
you are up and running with the Pi, feel free to choose your favorite language and start connecting. I have used
<a href = "https://github.com/pubnub/python"> Python </a> for this project.
</p> <br>
<h2>Basics of Connecting the Raspberry Pi to PubNub</h2>
<p>Follow these steps to get connected. </p>
<br>
<p> <strong> STEP 1: </strong> Connect the Pi to a monitor, keyboard, mouse and ethernet cable. Check out their website at
<a href = "http://www.raspberrypi.org"> Raspberry Pi </a> to set up your Pi. Login in to
the Raspberry Pi OS and open IDLE, the python IDE.
<br></br>
<p> <strong> STEP 2: </strong> Open a new window and paste the following code.
<pre><code>from Pubnub import Pubnub
from iotconnector import iotbridge
pi = iotbridge(publish_key = 'demo', subscribe_key = 'demo', uuid = 'PI')
channel = 'iotchannel'
message = "hello from pi"
def callbackfn(message):
print(message)
pi.send(channel, message)
pi.connect(channel, callbackfn)</code></pre>
<blockquote>
<p> The above code lets you set up the following :
<ul>
<li> publish key using "publish_key" </li>
<li> subscribe key using "subscribe_key" </li>
<li> UUID using "uuid" </li>
<li> channel you wish to subscribe and publish to using "channel"</li>
<li> message that you want to send. This is a JSON message. </li>
</ul>
</p>
</blockquote>
<p> We create an instance of the iotwrapper called pi and we can use the SEND and CONNECT methods belonging to that
class.
<br></br>
<strong>SEND: </strong>This invokes the publish() API to send any message over a desired
channel.</p>
<p><pre><code>def send(self, channel, message):
self.pubnub.publish({
'channel' : channel,
'message' : message})</code></pre></p>
<br></br>
<p><strong>CONNECT:</strong> This invokes the subscribe() API to listen for messages from other embedded devices
connected to the same channel.
the call back function receive is invoked when subscribe runs.
</p>
<pre><code>def connect(self, channel, receiver):
self.pubnub.subscribe({
'channel' : channel,
'callback' : receiver
})
<br>
<p> You can customize the channels you publish/subscribe to, the UUID you assume and also the messages you
send by just changing the above fields.
<br></br>
<p> <strong> huzzzaaaaah! </strong>
Thats it! You can now talk Raspberry Pi to any other device or application subscribing/publishing to the same channel.
</p>
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<h3>PubNub</h3>
<p>The PubNub Realtime Network powers thousands of apps, streaming more than 3 million messages a second to over
200 million devices a month.
<p><a class="btn btn-default" href="http://www.pubnub.com" role="button">View details »</a></p></p>
</div>
<div class="sidebar-module">
<h3>Related Blog Posts</h3>
<ul>
<li>IoT Arduino board connected to the Dashboard</li>
</ul>
</div>
<div class="sidebar-module">
<h4>Elsewhere</h4>
<ol class="list-unstyled">
<li><a href="#">GitHub</a></li>
<li><a href="#">Twitter</a></li>
<li><a href="#">Facebook</a></li>
</ol>
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Raw
iotconnector.py
from Pubnub import Pubnub
import string
import time
import random
import uuid
class iotbridge(object):
def __init__(self, publish_key,
subscribe_key,uuid):
self.publish_key = publish_key
self.subscribe_key = subscribe_key
self.uuid = uuid
self.pubnub = Pubnub( 'demo', 'demo', None, False)
self.pubnub.uuid = self.uuid
def send(self, channel, message):
# Sending message on the channel
self.pubnub.publish({
'channel' : channel,
'message' : message})
def connect(self, channel, receiver):
# Listening for messages on the channel
self.pubnub.subscribe({
'channel' : channel,
'callback' : receiver
})
Raw
pi.py
from Pubnub import Pubnub
from iotconnector import iotbridge
pi = iotbridge(publish_key = 'demo', subscribe_key = 'demo', uuid = 'PI')
channel = 'iotchannel'
message = "hello from pi"
def callbackfn(message):
print(message)
pi.send(channel, message)
pi.connect(channel, callbackfn)
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