npm install Socket.IO redis --save

   var server = require('http').createServer();
var io = require('Socket.IO')(server);
io
    .of('/notification')
    .on('connection', socket => {
        console.log('user connected to notification');
        socket.on('disconnect', () => console.log('user disconnected'));
    });

io
    .of('/chatting')
    .on('connection', socket => console.log('user connected to message'));

server.listen(3001, () => console.log('Socket.IO listen to port 3001'));

   var socket = io('/notification');
socket.on('message', function (msg) {
    console.log(msg);
});

   var redis = require('redis');
var redisClient = redis.createClient();
var NOTIFICATION_CHANNEL = 'notification_channel', CHATTING_CHANNEL = 'chatting_channel';

redisClient.on('message', function(channel, message) {
    switch (channle){
        case NOTIFICATION_CHANNEL:
            console.log('notification received:', message);
            io.of('/notification').emit('message', message);
            break;
        case CHATTING_CHANNEL:
            console.log('chatting received:', message);
            io.of('/chatting').emit('message', message);
            break;
    }
});
redisClient.subscribe(NOTIFICATION_CHANNEL);
redisClient.subscribe(CHATTING_CHANNEL);

   $ node app.js
Socket.IO listen to port 3001

   $ redis-cli
127.0.0.1:6379> publish notification "fuck you!"