controls rodi from nodejs

rodi.js

const request = require('request')
const requestStream = require('request-stream');
const EventEmitter = require('events');
const intervalManager = require('./intervals-manager')

var speed = 100;
var loop = 100;

class Rodi extends EventEmitter {
    constructor( url ) {
        super();
        this.url        = url;
        this.blink      = 1;
        this.sense      = 2;
        this.move       = 3;
        this.sing       = 4;
        this.see        = 5;
        this.pixel      = 6;
        this.senseLight = 7;
        this.led        = 8;
        // don't support
        this.imu        = 9;
    }
    forward( speed ) {
        request.get(this.url + this.move + `/${speed}/${speed}`);
        this.emit('forward');
    }
    back( speed ) {
        request.get(this.url + this.move + `/-${speed}/-${speed}`);
        this.emit('back');
    }
    right( speed ) {
        request.get(this.url + this.move + `/${speed}/-${speed}`);
        this.emit('right')
    }
    left( speed ) {
        request.get(this.url + this.move + `/-${speed}/${speed}`);
        this.emit('left')
    }
    stop() {
        request.get(this.url + this.move + '/0/0');
        this.emit('stop');
    }

    frontView() {
        var self = this
        // TODO: little hack because of rodi-web I think
        requestStream(this.url + this.see, function( err, res ) {
            if (err) 
                self.emit('error', err)
            var chunks = [];
            res.on("data", ( chunk ) => { chunks.push(chunk) });
            res.on("end", () => { self.emit('distance', Buffer.concat(chunks)) });
            res.on("error", function( err ) {
                self.emit('error', err)
            })
        });
    }
}

var rodibot = new Rodi('http://192.168.4.1:1234/');
var frontViewIntervalId = null;
var i = 0;

var loopFn = function() {
    rodibot.frontView();
};

rodibot.on('forward', () => {
    console.log("RODI GO!");
    frontViewIntervalId = intervalManager.make(loopFn, loop);
})

rodibot.on('distance', (value) => {
    console.log("distance", value.toString());
    var val = value.toString();
    if (val <= 25) {
        rodibot.stop();
        intervalManager.clear(frontViewIntervalId)
    }
})

rodibot.on('right', () => {
    console.log("RODI ROTATES")
    setTimeout(() => {
        rodibot.stop();
        rodibot.forward(speed)
    }, 700)
})

rodibot.on('left', () => {
    console.log("RODI ROTATES")
    setTimeout(() => {
        rodibot.stop();
        rodibot.forward(speed)
    }, 800)
})

rodibot.on('stop', () => {
    console.log('RODI STOPPED')
    i++
    if (i % 2 !== 0)
        rodibot.left(speed)
})

rodibot.on('error', ( err ) => {
    rodibot.stop();
    throw new Error(err)
})

rodibot.forward(speed)