Firefox WebSerial API Test

script.js

/* Try it in Scatchpad */
var serial = new SerialPort();
/* Change the port with yours */
serial.port = '/dev/ttyACM0';
console.log('Serial open? ' + serial.open());
console.log('Send text to the port serial');
serial.write('WebSerial API form Firefox!');
/* Little delay of 2 second for read the output form Arduino */
setTimeout(function () {
  temp = serial.readline();
  temp = temp.replace(/(\r\n|\n|\r)/gm,"");
  console.log('Output form Serial port: ' + temp);
  console.log('Close connection');
  serial.close();
}, 2000);

sketch Arduino

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    Serial.println("I received the message: " + Serial.readString());
  }
}

WebSerial API test

Download from https://bugzilla.mozilla.org/show_bug.cgi?id=926940 the development build with the WebSerial API
Screenshot: https://plus.google.com/u/0/+DanieleScasciafratteMte90Net/posts/EED6sbEt2zv