How the App Works?

A detailed description is addressed in the following article Maximizing WebRTC Potential

Calling App using Web RTC and Java

This project covers an implementation of Web RTC in Java to establish an app to app calling Mechanism.

You will get a UI like attached above.

How to run the app?

To start the application you will need to start the Signalling server. A signalling server helps in sharing the ICE candidates between the peers [it must be over secure medium, i.e. wss], it is build using WebSockets or anyother related library like Socket.io. You can use the signalling server from this repo. Here I implemened a simple websocket based Node Js server that helps in establishing connection between peers.

Starting the Signalling Server

You need to run the following commands for first time execution to install the required packages. yarn or npm install Then you need to start the server using yarn start or npm start

Now you have the signalling server up and running on port :3000 you can edit this port from the index.js file in the repository.

How to add it to the App?

When you open the app code base you will see a SocketRepository class here we have implemented a connection to the Signalling Server

// Here in the place of new URI("") => need to add 
// your connection string in place of the ""
this.webSocketClient = new WebSocketClient(new URI("")) {
                @Override
                public void onOpen(ServerHandshake handshake) {
                    sendMessageToSocket(
                            new MessageModels(
                                    "store_user", username, null, null
                            )
                    );
                }

                @Override
                public void onMessage(String message) {
                    try {
                        onNewMessage(new Gson().fromJson(message, MessageModels.class));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onClose(int code, String reason, boolean remote) {
                    Log.d(logTag, "onClose: " + reason);
                }

                @Override
                public void onError(Exception ex) {
                    Log.d(logTag, "onError: " + ex.toString());
                }
            };

How can you get a Secure Connection link to your local Signalling server?

You can use tools like ngrok to get a secure like to your local server. To run the server with ngrok, start the signalling server and run the following commands: ngrok http 3000 This command will give you a secure link to you local server.

ngrok                                                                                                                                                                                        (Ctrl+C to quit)
                                                                                                                                                                                                             
Send your ngrok traffic logs to Datadog: https://ngrok.com/blog-post/datadog-logs                                                                                                                            
                                                                                                                                                                                                             
Session Status                online                                                                                                                                                                         
Account                       username@mail.com (Plan: Free)                                                                                                                                   
Version                       3.3.1                                                                                                                                                                          
Region                        India (in)                                                                                                                                                                     
Latency                       -                                                                                                                                                                              
Web Interface                 http://127.0.0.1:4040                                                                                                                                                          
Forwarding                    https://c76d-58-65-176-42.ngrok-free.app -> http://localhost:3000                                                                                                              
                                                                                                                                                                                                             
Connections                   ttl     opn     rt1     rt5     p50     p90                                                                                                                                    
                              0       0       0.00    0.00    0.00    0.00