Arduino Serial - OpenProcessing

mySketch
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let serial;
let latestData = "waiting for data";
let obj = {};
​
function setup() {
 createCanvas(windowWidth, windowHeight);
​
 serial = new p5.SerialPort();
​
 serial.list();
 serial.open('/dev/tty.SLAB_USBtoUART');
​
 serial.on('connected', serverConnected);
​
 serial.on('list', gotList);
​
 serial.on('data', gotData);
​
 serial.on('error', gotError);
​
 serial.on('open', gotOpen);
​
 serial.on('close', gotClose);
}
​
function serverConnected() {
 print("Connected to Server");
}
​
function gotList(thelist) {
 print("List of Serial Ports:");
​
 for (let i = 0; i < thelist.length; i++) {
  print(i + " " + thelist[i]);
 }
}
​
function gotOpen() {
 print("Serial Port is Open");
}
​
function gotClose(){
 print("Serial Port is Closed");
 latestData = "Serial Port is Closed";
}
​
function gotError(theerror) {
 print(theerror);
}
​
function gotData() {
 let currentString = serial.readLine();
  trim(currentString);
 if (!currentString) return;
 console.log(currentString);
 latestData = currentString;
 obj = JSON.parse(latestData);
}
​
function draw() {
 background(255,255,255);
 fill(0,0,0);
 text(obj.ir, 10, 10);
 if (obj.ir == 1) {
   fill(0);
 } else {
   fill(255,0,0);
 }
 ellipse(width/2, height/2, 100,100);
 // Polling method
 /*
 if (serial.available() > 0) {
  let data = serial.read();
  ellipse(50,50,data,data);
 }
 */
}