Category: Perl

How to use WebSockets • React Native

It can be very simple to do GET, POST, PUT and DELETE requests with React Native (see the official Expo documentation, therefore, those requests are not interesting when we want to do a chat for example (we can talk about “real time events”).

To do it, you need first to create a WebSocket server. It won’t be on the phone, because usually the phone is only the client.

You can create a simple WebSocket server with this Perl library :
Only few lines are necessary to make your WebSocket server running.

In your App.js, you can add the IP of your server in a global variable at the top of your file :

Then in your constructor you can add the WebSocket( WS_ADRESS_SERVER_STRING ) Javascript object, so the websockets will be listen when the application is starting.
You can add the 4 events onopen, onmessage, onerror, onclose :

Now you should add ws.send() to send data inside your code or inside your UI with onPress.