socket.write with delay

test.js

const net   = require("net");

const MACHINE_PORT = 8081;

function* machineDataGenerator() {
    yield 'ONE\r\n';
    yield 'TWO\r\n';
    yield 'THREE\r\n';
}

var machine = net.createServer();

machine.on('connection', (socket) => {
    var machineData = machineDataGenerator();
    
    var writeData = function (socket) {
        data = machineData.next().value;
        
        if (data) {
            setTimeout(function () {
                socket.write(data);
                writeData(socket);
            }, 1000);
        }
        else {
            socket.destroy();
        }
    };

    writeData(socket);

});

machine.listen(MACHINE_PORT, "localhost");