INTRODUCTIONRealtime Communication in Mobile

Girish Rengaswamy, Senior Manager - Mobile Solutions

What is real-time communications (RTC) ?•Instant exchange of information.

•Direct path between the source and the destination.

•Half-duplex or full-duplex modes.

Real-time communications can include:

• Telephony in the conventional sense

• Mobile and cellular telephone

• Two-way or multi-way amateur radio

• IRC or other chatting modes

• Live videoconference and teleconference communications

• SMS/MMS/IM

Why did RTC using SMS/MMS failed?•Data Congestion

• MMS is difficult to setup in the handset

•Data limitation

•Cost

RTC in the Web: Early days•IRC•Yahoo Chat•ICQ•AIM•MSN Messenger•Skype

RTC in Mobile: Now!

WhatsApp FB Messenger

Telegram

Skype

WeChat

Hike Viber

Snapchat

Line

SlackBBM QQ

RTC Mobile apps usageWhatsapp

FB Messenger

QQ

WeChat

Skype

Line

Viber

Telegram

Hike Messenger

0 100 200 300 400 500 600 700 800 900 1000 1100

Active User (Millions)

Technologies used by RTC Mobile apps WhatsApp FB Messenger Telegram Slack

Protocol XMPP MQTT MTProto WebSocket

Server/Broker ejabberd/YAWSIBM

MessageSight/mosquitto*

Unknown Java messaging service/Apache

Server Side Programming Language Erlang/PHP* Java* Unknown Java/PHP

Online Database Mnesia/MySQL* Unknown Unknown MySQL

Offline DB SQLite SQLite SQLite SQLite

* The information presented here has been collected from third party sources as many of apps mentioned here are not open about their architecture.

Understanding WhatsApp architecture

XMPP (eXtensible Messaging and Presence Protocol)•XMPP is a client-server application protocol.•Uses TCP while WebSockets can also be used.•Push instead of pull.•Matured implimentaton.•Serverless Messaging (P2P) for Video, Audio and File transfer•Open source servers: Wildfire, ejabberd, Jabberd 2, Jabberd 1.4•Supports wide variety of datastore like: MySQL, Postgresql, Oracle, sqlite, Berkeley DB, file

WebSocket Protocol•WebSocket is a protocol providing full-duplex communication channels over a single TCP connection.

•Works seamlessly over web, mobile and standalone application.•Works over a firewall•Client implementation in all most all the languages•Can be implemented in mobile apps using the following library

• iOS : SocketRocket•Java-WebSocket

Architecture for a scalable RTC App

Cloud Based Platform Solutions for RTC

What’s Next?•IOT based RTC mobile apps

•AI systems

•Wearables

•Remotely control machines/robots/drones

Thank You

girish.r@fingent.com

girish.r@gmail.com