How to make the application "follow" events constantly?

Question

iOS

Good day, I'm trying to write a small chat, on the server I use node.js and socket.io, on the client (ios) Swift and the SocketIOClient library. On the server, I implemented sending, receiving messages, authorization, connect and disconnect, and on the client there was a problem, I can’t figure out how to listen to events all the time. I created a singleton, implemented all the methods related to the work of socket.io in it, it sends data and they come to the server, the server sends them to the same socket id, but my device no longer accepts them. How to implement "surveillance" of these events? Can use Observer? or a separate thread that will spin in a loop and check (but this is some kind of collective farm already fierce)? Can anyone suggest which way to look? Thanks in advance)

Answer 1

Do it through push notifications. I don't know anything else to access the app when it's inactive

Answer 2

On a server

var app = require('express')()
var server = require('http').Server(app)
var io = require('socket.io')(server)

server.listen(3000)

io.on('connection', function(socket) {
  socket.on('comment', function(data) {
    io.emit('comment', data)
  })
}

On the client

socket.on("comment") {[weak self] data ,ack in
// получаешь комменты
}