Get data from NodeJS to Dart/Flutter using Socket.io - node.js

Question

I'm trying to get data from the NodeJS and I've no idea how to do this can someone help me? The packages used in this example are: import 'dart:async' and import 'package:socket_io_client/socket_io_client.dart';
testSocket.dart
void testSocket(socket) async {
Socket socket;
try {
// Configure socket transports must be sepecified
socket = io('http://127.0.0.1:3000', <String, dynamic>{
'transports': ['websocket'],
});
// Connect to websocket
socket.connect();
// THIS IS WHERE I WANT TO PRINT THE DATA THAT WE GOT RECIEVED FROM NODEJS
socket.on('event', (data) => print(data));
}
print("connected: ${socket.connected}");
}
index.js
const server = require('http').createServer()
const io = require('socket.io')(server)
io.on('connection', function (client) {
client.on('event', function name(data) {
data = "test";
// Send data somehow to Flutter
io.on();
});
});
// The live server
var server_port = process.env.PORT || 3000;
server.listen(server_port, function (err) {
if (err) throw err
console.log('Listening on port %d', server_port);
});
I really appreciate it that you are taking time to help me out!

Answer 1

You have to emit events from your server and your client has to subscribe to those same events in order to receive data and updates.
testSocket.dart
void testSocket(socket) async {
Socket socket;
try {
socket = io('http://127.0.0.1:3000', <String, dynamic>{
'transports': ['websocket'],
});
socket.connect();
socket.on('testEvent', (data) => print(data));
}
print("connected: ${socket.connected}");
}
And your server has to then emit the testEvent with some data.
index.js
const server = require('http').createServer()
const io = require('socket.io')(server)
io.on('connection', function (client) {
client.on('event', function name(data) {
data = "test";
client.emit('testEvent', data);
});
});
var server_port = process.env.PORT || 3000;
server.listen(server_port, function (err) {
if (err) throw err
console.log('Listening on port %d', server_port);
});
Now since we're firing just a one-off event, the data will only come once. You'd have to emit the same event in order for the clients to receive updates.