Phil Leggetter is a Developer Evangelist at Pusher, a real-time web hosted service for adding live interactive content to web and mobile apps. He’s been developing and using realtime web technologies for over 10 years. Pusher is one of our favorite APIs and we recently ran into Phil at a telephony meetup in San Francisco where he demoed a very cool Twilio and Pusher hack.
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We asked Phil if he could share how he built his Pusher and Twilio app and he wrote an amazing tutorial below on how to build a realtime web app with Twilio.
A few weeks ago I gave a talk at the San Francisco Telephony Meetup, but since I work for Pusher my focus is the realtime web, and how realtime web technologies can add value to web and mobile applications, and not telephony. However, this talk had to have a Telephony focus. I know UK-based Twilio Evangelist Stevie Graham, and he quite frequently uses Pusher in his awesome hacks.
I thought it was time to return the favour and put together a realtime SMS and incoming call notifications demo for my talk that uses Pusher and Twilio. It goes to show that realtime web and telephony technology work amazingly well together.
Here’s a tutorial demonstrating how easy it is to use two awesome cloud technologies to build this app.
Show Me The Demo
Okay, okay. Before we start, you can see the demo up and running here: http://pushtel.herokuapp.com/. Just send a text message or call either the US or UK number and you’ll almost instantly see the web app update indicating you’ve sent a text or made a call.
Show Me The Code
Before we start you’ll obviously need a Pusher account, a Twilio account and a Ruby development environment as the back-end code is in Ruby using Sinatra as the web server.
The files within the app are as follows:
- app.rb – main Ruby app code
- config.yml
- Gemfile
- public/js/app.js – core JavaScript code
- views/index.erb
Take the app credentials from your Pusher account and add them to the config.yml file:
Add the following to the Gemfile:
Run bundle install to fetch the app dependencies.
Now the basic structure is in place we can look at app functionality.
Pusher: Connect and Subscribe
For the web browser to receive any data from Pusher a connection must first be established.
Let’s first create an index action within the Sinatra app:
Within the index action we assign the Pusher app_key to an @app_key property which is then available in the index.erb view.
In the view include jQuery, the Pusher JavaScript library, make the app_key accessible to JavaScript and include js/app.js, where we’ll write the rest of our JavaScript:
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Run ruby app.rb and open a web browser at http://localhost:4567 to test that app is running.
In app.js create a new Pusher object to establish a connection to Pusher.
If you want to check you are connected you can either bind to connection state changes, use the Pusher.log logging or use the Pusher debug console.
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Pusher uses channels as a way of filtering and routing data. In this app we’re interested in SMS messages and phone calls so we’ll subscribe to two channels; one for SMS messages and one for calls:
In the code above we bind to events on the channels. Events are a great way of hooking UI changes to application events. When the sms_received event is triggered on the sms channel we add a new <li> to a SMS list and when the call_incoming event is triggered on the calls channel we add add a new <li> to an Incoming Calls list. Simple!
The HTML for the UI looks like this:
So, although it doesn’t look great that’s actually all the functionality we need on the client. But how do we test it works?
Easy! Use the Pusher Event Creator to trigger events.
After a few tests of each the app will look as follows:
We now know that the client-side works so let’s look at the server-side, starting with Twilio.
Twilio: Define WebHook endpoints
WebHooks are a great way of informing web apps of events over a network, in this case the Internet. In the case of Twilio there are a bunch of really handy WebHooks for SMS and call notifications. For our app we want to be informed of SMS messages and incoming calls.
Note:When writing code to handle WebHooks testing locally can be tricky since the WebHooks may come from other services on the Internet and thus your web app needs be made publicly accessible. If you’re familiar with Twilio you’ll probably already know about localtunnel, but if not your can read more about it on the Twilio Engineering blog.
Sinatra: Create WebHook routes
In the image above you’ll see that we’ve defined two WebHook endpoints that should be called when event’s we’re interested occur. So, let’s create the two routes in our Sinatra app to handle the WebHook calls and do some very basic authentication about the WebHook calls; we’ll check that the AccountSid that is sent matches our own Twilio AccountSid which you’ll find in your Twilio Dashboard:
Sinatra makes that too easy. As you’ll see we’ve defined that AccountSid in config.yml.
Note:If you’re creating a production quality app then you should of course also add full Twilio WebHook authentication to your app. For more information see the Twilio security docs.
Pusher: Publish events
All that’s left to do now is publish the events using Pusher. First we need to set up the Pusher gem with our credentials that we set in config.yml.
Asme section viii free download. And then update the route actions to extract the required values from the WebHook call and trigger events on the associated channels.
Tada!
If deploy your application so that it, and your WebHook endpoints, are publicly accessible (on somewhere like Heroku) and text or call the number that is associated with your application WebHook you’ll instantly see the notification appear in the web app…
No, seriously that’s it! You’ve not got realtime notifications of incoming calls and SMS messages being displayed in a web app. I told you Pusher and Twilio made making these types of apps seriously easy!
You can find the code for a slightly more stylised version this app in github. You can also try it out for yourself.
If you build anything cool with Twilio and Pusher, or have any questions, I’d love to hear from you. Please drop me an email via phil@pusher.com or tweet me at @leggetter
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With iOS 13 and iPadOS 13, apps and games that you download from the App Store are automatically updated by default. You won't see notifications about updating your apps. But you can also update apps manually. For example, if you want to force an update, you can update an app manually.
If you prefer to manually update all your apps, you can turn off automatic updates.
When you download an app on one device, the app isn't automatically installed on your other devices. But if you want apps that you purchase to be downloaded on all of your devices, you can turn on Automatic Downloads.
Before you begin
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- Make sure that you have the latest version of iOS and iPadOS, macOS, or watchOS.
- Sign in to all of your devices with the same Apple ID.
Update your apps manually
Update apps manually on your iOS or iPadOS device, on your Mac, or on your Apple Watch.
How to manually update apps on your iPhone, iPad, or iPod touch
- Open the App Store, then tap Today at the bottom of the screen.
- Tap your profile icon at the top of the screen.
- Scroll down to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All.
How to manually update apps on your Mac
- Open the App Store.
- In the sidebar, click Updates.
- Click Update next to an app to update only that app, or click Update All.
If you didn’t get the app from the App Store on your Mac, contact the app developer to get help with updates.
How to manually update apps on your Apple Watch
- On watchOS 6, open the App Store and scroll down to the bottom.
- Tap Account.
- Tap Updates.
- Tap Update next to an app to update only that app, or tap Update All.
Turn on or turn off automatic updates
- On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iTunes & App Store. Then turn on or turn off App Updates.
- On your Mac, open the App Store. From the menu bar at the top of the screen, choose App Store > Preferences. Select or deselect Automatic Updates.
- On your Apple Watch, go to Settings > App Store. Turn on or turn off Automatic Updates. Or open the Watch app on your iPhone, scroll to App Store and tap it, then turn on or turn off Automatic Updates.
- On your Apple TV HD or 4K, go to Settings > Apps. Select or deselect Automatically Update Apps.
When you turn off automatic updates, you receive notifications from the App Store each time an update for one of your apps is released.
Turn on or turn off automatic downloads
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- On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iTunes & App Store. Under Automatic Downloads, turn on or turn off Apps.
- On your Mac, open the App Store. From the menu bar at the top of the screen, choose App Store > Preferences. Select or deselect 'Automatically download apps purchased on other Mac computers.'
- On your Apple Watch, go to Settings > App Store. Turn on or turn off Automatic Downloads. Or open the Watch app on your iPhone, scroll to App Store and tap it, then turn on or turn off Automatic Downloads.
- On your Apple TV HD or 4K, go to Settings > Apps. Select or deselect Automatically Install Apps.
On your iOS or iPadOS device or Mac, you can also turn on automatic downloads for iTunes Store music purchases and Apple Books purchases.
Learn more
- Learn how to resume interrupted downloads.
- Learn how to redownload items that you purchased previously.
- Learn more about how to download apps and games from the App Store.