The document describes the Polycom Cast application, which allows users to cast Polycom meeting content to a Chromecast device. It provides instructions for developers to build and run the Android project. The application uses Chromecast's casting abilities to stream meeting content from a server to a TV or monitor even if the mobile device turns off or loses battery power, by establishing a direct connection between the server and Chromecast.

1. Polycom Cast App
P o l y c o m , I n c .

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Table of Contents
1. Introduction 2
2. Preliminary Checklist 2
3. Why Chromecast? 3
4. Instructions for Developers 7
5. Background procedure 10

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Introduction
Do you want to show your meeting content for a group of members? Share meeting experience
with your colleagues and friends? Do you want to cast the content even after you turned off
your mobile device? Do you want to cast your meeting content even after your mobile device
turned off?
Here is a solution for that; Polycom Cast Application. It provides the feature of casting
and uses chrome cast as casting device. Polycom Cast Application just needs username,
password and meeting ID, by entering these required credentials it will take you to the
webView of apiView and at the top of the application window you can see the cast button, you
can select the device to which you want to cast.
Preliminary Checklist
 Both the casting device (android mobile or tablet) and casting to device (HDMI enabled
TV or monitor) should be in same Wi-Fi connectivity.
 Check whether the casting icon at the top of the application window when you start it.
 Make sure that username, password and meeting ID are known.

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Why chrome cast?
This section describes why we have chosen chrome cast.
The main and profitable reason is, it is very cheaper than any other casting device.
Chrome cast can cast most of the applications like Netflix, YouTube. Connecting the dongle is
pretty simple and just needs an HDMI port for TV or monitor. TabCasting is another advantage
provided by chrome cast. We can cast any site by using the option TabCast from chrome
browser.
The following table lists Major Apps compared among Google Chrome cast, Roku, Apple TV
and Amazon Fire TV.
Google Chrome Cast Roku Apple TV Amazon Fire TV
Netflix Cast Yes Yes Yes
Amazon
Instant
Tab cast Yes Airplay Yes
You Tube Cast Yes Yes Yes
Flixster Cast Yes No Yes
Starz Play Cast No No No
Crackle Cast Yes Yes Yes
PBS Tab Cast Yes Yes Yes
BloombergTV Cast Yes Yes Yes
Pandora Cast Yes Airplay Yes
Spotify Tab Cast Yes Yes Yes

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Rhapsody Cast No Airplay No
Tuneln Tab Cast Yes Airplay Yes
Google Music Cast No No No
Google Play
Movies and TV
Cast Yes No No
Plex Cast Yes Yes Yes
Now we can consider some questions like: What will this application can do? Why anyone
need this? Where this can be useful? How to use?
What will this application can do?
Meetings from wspbeta1 server can be casted into big screens. Casting to big screens
makes you feel better towards clarity and will be much helpful in group discussions. For
example consider a scenario of a conference where you are the only person who can access to
the meeting but remaining people also needs to listen to that meeting, at that time this will
helps you a lot.
If you have a laptop then open meeting in chrome browser and just cast it. For casting
the content view from a laptop it should be installed with chrome browser or else you can cast
it from android app which just asks to enter some credentials.

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Why anyone need this?
In general case if you want to show anything on big screen you can use tab casting
option from Google Cast extension but with less resolution. This application will help you to
cast meeting ApiView with high resolution also works faster than tab casting. It is very easy to
share the meeting content to friends, colleagues with Polycom Cast App. It will be very helpful
for the people for those who aren’t with good eye sight.
Where this can be useful?
Think that you are in a journey and not able to take laptop with you and have to a
meeting. If your android device has installed with Polycom Cast App Hence this application
will open webView in android device and enables cast experience, this will helps allot for big
conferences. If your device has enabled with Wi-Fi as same as chrome cast you can get cast
icon if you are not then your device already featured with webView page, by this you can
participate in the meeting.
And also in a case that where you don’t have enough battery charging on your device
you can just cast it to the big screen and can see the content. If your mobile device may get
switched off or may crash still you can see the content on your big screen since it is directly
streaming from server.

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How to use?
Just install and open the Polycom Cast App you can see the UI as shown in the following figure:
Then enter username, password and meeting ID and click on LOGIN button. If authentication
gets success then you will be redirected to webView and cast icon at the right top of the
window as shown in the above figure. For casting just tap on the cast icon it will show the
active cast devices you can select a device from the dropdown. Then it will be casted onto the
big screen. Final result will be Happy Casting!!

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Instructions for Developers
Execution of Android Project:
Install Android Studio:
 Go to https://developer.android.com/sdk/index.html click on “Download Android
Studio for Windows”.
 Run the installer, it will asks for permission to run just click on Ok.
 Then installer wizard will be opened click next to continue, follow the
instructions and finish the installation process.
1. After installation, start Android Studio by clicking on shortcut that has been created on
the desktop or else go for path where the tool had been installed, in bin folder click on
the application file, there starts the Android Studio.
2. Select Import Project option from the window displayed.
3. Select the “NewProject” from the unzipped content and then click Ok (you can select
any other android project instead of “NewProject”).
4. After importing the project you can see only the app folder at right of window.
5. To run the project click on RUN option at tool bar, and select “Run app” option from the
popup.
6. After building the gradle successfully it will asks to choose an emulator (it will show
default emulator, better to choose that) click Ok.
7. It will launch the emulator and runs application.

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Generating APK file:
1. Open android application in Android Studio, on toolbar click BUILD.
2. Select Generate Signed Apk option from the popup.
3. If keystore is already existed choose existing option else choose to create new.
4. After entering keystore details click ‘Next’.
5. Select the path for apk file to be generated in and then click Ok.
6. Apk file will be generated successfully if the keystore is correct.
7. The generated apk file can be installed to any android device.
Installing APK file into Android device:
1. Connect android device with the PC and copy the apk file into your device and just tap
on it to run after installation.
OR
2. Copy apk file into the store and just tap on it to run.
If u don’t have android studio you can use command line to generate apk file. For generating
apk file for android project you can follow the steps specified below:
1. Open command line and navigate to root of the project.
2. Just type “gradlew.bat assembleDebug” (it will build debug file at appbuildoutputsapk with
name apk-debug).
3. Wait for some time, until you get a message “Build Successfull”

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4. After that you can type “gradlew.bat assembleRelease” (it will build debug file at
appbuildoutputsapk with name apk-release-unsigned). It will creates unsigned apk.
5. When you build using the release build type, the .apk file is unsigned, so you must manually
sign it with your own private key, using Keytool and Jarsigner settings in the module’s
build.gradle file.
6. To build signed apk follow these steps:
 Open a command-line and navigate to the root of your module directory.
 Edit the build.gradle file at app to build your project in release mode:
...
android {
...
defaultConfig { ... }
signingConfigs {
release {
storeFile file("myreleasekey.keystore")
storePassword "password"
keyAlias "MyReleaseKey"
keyPassword "password"
}
}
buildTypes {
release {
...
signingConfig signingConfigs.release
}
}
}
...
 On command-line again run “gradlew.bat assembleRelease”command

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7. This will generate “apk-release.apk” at “appbuildoutputsapk”. This .apk file has been signed
with the private key specified in build.gradle file. It’s readyfor installation and distribution.
NOTE:
“myreleasekey.keystore” should be existed in root folder otherwise we should specify
the absolute path for the keystore (keystore.jks).
Background procedure:
The solution for tackling the problem of casting when your mobile device turned off is to get a
connection between server and the chromecast, for which one needs to get connected with one
of the available chromecast devices.
Two protocols are implemented on Chromecast to support discovery of chromecast device:
 The first is an implementation of the DIAL (DIscovery and Launch) protocol over
SSDP. This is the primary system used for the old v1 of Google Cast SDK.
 The second protocol implemented is an mDNS (multicast Domain Name System)
server. This is the primary way of discovering a Chromecast that supports the
v2API. For achieving the objective of Polycom RPWS native APP for chromecast,
latest version of Chromecast discovery protocols mDNS is used.

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Steps involved :
1. Check whether Chromecast is available.
2. Request a session with the APPID of the receiver.
3. Lock the horns with Receiver by
i) Session Listener (if already Exists) or
ii) Receiver Listener (to Create a new one)
4. Initialize the receiver by
a) Receiver Listener (chosen if no session exists)
i) Generates “Session” object and checks the property of availability.
ii) Availability of at least one Chromecast device on the network will lead to a
valid session.
iii) Executes the onReady Function to execute the task specified.
b) Session Listener (chosen if a valid session exists)
i) With the existing session ID checks whether the session is Alive
If false – Remove the session and make session objects as null.
ii) Else (id true) get the messages from the receiver on the bus using namespace
iii) Execute the onReady unction to execute the task specified.

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Actions by Sender :
1. Sender gets the Username and Password from the login Page.
2. When user clicks on login with valid meeting ID, the Sender itself “POST” request the
server to get the Token ID and username.
The Parameters in the POST request are Origin (URL), Credentials (Usrname and
Password), headers, return data type (JSON) and Content Type.
3. On successful POST Request, there exists JSON as return type containing the valid Token
ID and Username.
4. Fills up the URL with the token ID and Username and meeting ID. For instance the URL
should be
https://rpwsbeta1.cloudax.is/?embedded=true&autostart=true&pluginenabled=false&stage=tru
e&token=095B2821CEA206B9-D3B59618-A24F64B8-E44D1BAE-
BE2A0E1BEC8065FC0EDD83D3&username=”username”&meeting=”meeting id”#/apiview
5. Thus formed URL is sent to the receiver.

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Actions by Receiver :
1. Starts the Receiver Manager.
2. Waits at the onReady Function (Untill some sender gets connected).
3. When sender gets connected, Receiver create a castMessageBud to handle messages
over the agreed upon namespace.
4. OnMessage arrival from sender, (i.e., URL), the receiver opens a browser with URL
received and acknowledges the sender upon its success/failure.
Upon the successful communication between sender and receiver there gets established
a virtual connection between the Cast Device and the server on the particular token ID
and meeting ID as sent by the sender. Receiver directly relies on the URL specified, as
directed by the sender app built-in to invoke the receiver independent of the sender
behavior (except Disconnection). On requesting a DELETE by the sender will disconnect
the session by invoking receiver. Another way to disconnect a session is that another
user in the same network destroys the current session and casts his session.