namespaces.js

var nsp2 = io.of('/2');
nsp2.on('connection', socket => {
    socket.on('change color', (color) => {
        nsp2.broadcast.emit('change color', color)
}

var nsp3 = io.of('/3');
nsp3.on('connection', socket => {
    socket.on('change color', (color) => {
        nsp3.broadcast.emit('change color', color)
}