var mqtt = require('mqtt')
var options = {'clientId':'5a634bc37aa7',
              'username':'JzU0Lx5VHg',
              'password':'HhQM4FgkbF'}
var client = mqtt.connect('mqtt://localhost:1883',options);

function circle(radius, steps, centerX, centerY){
    var xValues = [centerX];
    var yValues = [centerY];
    for (var i = 0; i < steps; i++) {
        xValues[i] = (centerX + radius * Math.cos(2 * Math.PI * i / steps));
        yValues[i] = (centerY + radius * Math.sin(2 * Math.PI * i / steps));
    }
    return {'posX':xValues,'posY':yValues}
}

client.on('connect', function () {
    client.subscribe('/5a634bc37aa7/')
    console.log("Starting");
    var speed = 80;
    var acc = 5;
    var step = 0;
    var cir = circle(1,14440,13.7384,100.5321,13.7384);
    setInterval(function() {
        data = {};
        data.timeStamp = Date.now().toString();
        speed += (Math.random() * 10)-5;
        acc += (Math.random() * 10)-5;
        data.value = {'speed':speed,
                       'acc': acc};
        data.pos = [cir.posX[step],
                    cir.posY[step]];
        step += 1;
        client.publish('/5a634bc37aa7/message', JSON.stringify(data));
    }, 5000);
});

client.on('message', function (topic, message) {
    // message is Buffer
    console.log(message.toString());
})

lat = 13.7384
lon = 100.5321