Introduction:

RDK-C Mobile application will be used to watch live streaming from RPI Camera & Previous recordings from RPI Camera stored in Cloud Servers. In this mobile application we use WebRTC protocol for live streaming of video & audio, HTTP to play or download the previous recordings from cloud servers.

This mobile app will support android & iOS* platforms. This page is dedicated to bring up the overall picture of the mobile app and how it works.

About WebRTC:

Communication

In this mobile application we are using RTS  as communication protocol to get the live streaming content from RDK-Camera.

For previous recordings we are using HTTP protocol to get the respective information from the servers and display the previous recordings in the mobile app.

About RTS Protocol

...

WebRTC, short for Web Real-Time Communication, is both an API and a Protocol. The WebRTC protocol is a set of rules for two WebRTC agents to negotiate bi-directional secure real-time communication. A similar relationship would be the one between HTTP and the Fetch API. WebRTC the protocol would be HTTP, and WebRTC the API would be the Fetch API.

To establish WebRTC communication one should involve the below 4 steps:

1. Signalling
2. Connecting
3. Securing
4. Communicating

These four steps happen sequentially. The prior step must be 100% successful for the subsequent one to even begin. Each of these steps has dedicated chapters, but it is helpful to understand them at a high level first. Since they depend on each other, it will help when explaining further the purpose of each of these steps.

• Signalling:

            When a WebRTC Agent starts it has no idea who it is going to communicate with and what they are going to communicate about. Signalling solves this issue! Signalling is used to bootstrap the call                  so that two WebRTC agents can start communicating. Signaling uses an existing protocol SDP (Session Description Protocol). SDP is a plain-text protocol. Each SDP message is made up of key/value pairs and contains a list of “media sections”.

•  Connecting:    

Application Flow (Live streaming)

...