chrome.serial receiveTimeout Not working. - google-chrome-app

Question

Below code is a copy with minor edits from https://github.com/GoogleChrome/chrome-app-samples/tree/master/serial/ledtoggle. I am able to send a byte and receive a reply. I am not able to get an TimeoutError event in case of reply is not sent by the client. I have set timeout to 50 ms.
this.receiveTimeout = 50;
Entire code follows.
const DEVICE_PATH = 'COM1';
const serial = chrome.serial;
var ab2str = function(buf) {
var bufView = new Uint8Array(buf);
var encodedString = String.fromCharCode.apply(null, bufView);
return decodeURIComponent(escape(encodedString));
};
var str2ab = function(str) {
var encodedString = unescape((str));
var bytes = new Uint8Array(1);
bytes[0] = parseInt(encodedString);
}
return bytes.buffer;
};
var SerialConnection = function() {
this.connectionId = -1;
this.lineBuffer = "";
this.receiveTimeout =50;
this.boundOnReceive = this.onReceive.bind(this);
this.boundOnReceiveError = this.onReceiveError.bind(this);
this.onConnect = new chrome.Event();
this.onReadLine = new chrome.Event();
this.onError = new chrome.Event();
};
SerialConnection.prototype.onConnectComplete = function(connectionInfo) {
if (!connectionInfo) {
log("Connection failed.");
return;
}
this.connectionId = connectionInfo.connectionId;
chrome.serial.onReceive.addListener(this.boundOnReceive);
chrome.serial.onReceiveError.addListener(this.boundOnReceiveError);
this.onConnect.dispatch();
};
SerialConnection.prototype.onReceive = function(receiveInfo) {
if (receiveInfo.connectionId !== this.connectionId) {
return;
}
this.lineBuffer += ab2str(receiveInfo.data);
var index;
while ((index = this.lineBuffer.indexOf('$')) >= 0) {
var line = this.lineBuffer.substr(0, index + 1);
this.onReadLine.dispatch(line);
this.lineBuffer = this.lineBuffer.substr(index + 1);
}
};
SerialConnection.prototype.onReceiveError = function(errorInfo) {
log('Error');
if (errorInfo.connectionId === this.connectionId) {
log('Error');
this.onError.dispatch(errorInfo.error);
log('Error');
}
log('Error');
};
SerialConnection.prototype.connect = function(path) {
serial.connect(path, this.onConnectComplete.bind(this))
};
SerialConnection.prototype.send = function(msg) {
if (this.connectionId < 0) {
throw 'Invalid connection';
}
serial.send(this.connectionId, str2ab(msg), function() {});
};
SerialConnection.prototype.disconnect = function() {
if (this.connectionId < 0) {
throw 'Invalid connection';
}
serial.disconnect(this.connectionId, function() {});
};
var connection = new SerialConnection();
connection.onConnect.addListener(function() {
log('connected to: ' + DEVICE_PATH);
);
connection.onReadLine.addListener(function(line) {
log('read line: ' + line);
});
connection.onError.addListener(function() {
log('Error: ');
});
connection.connect(DEVICE_PATH);
function log(msg) {
var buffer = document.querySelector('#buffer');
buffer.innerHTML += msg + '<br/>';
}
document.querySelector('button').addEventListener('click', function() {
connection.send(2);
});

Answer 1

Maybe I'm reading the code incorrectly, but at no point do you pass receiveTimeout into chrome.serial. The method signature is chrome.serial.connect(string path, ConnectionOptions options, function callback), where options is an optional parameter. You never pass anything into options. Fix that and let us know what happens.