const deviceInfos = await FasterSerialPort.list();

const deviceInfo = deviceInfos.filter(d =>
d.path.indexOf(search) === -1 ||
d.manufacturer.indexOf(search) === -1 ||
d.serialNumber.indexOf(search) === -1 ||
d.pnpId.indexOf(search) === -1 ||
d.locationId.indexOf(search) === -1 ||
d.vendorId.indexOf(search) === -1 ||
d.productId.indexOf(search) === -1
)[0];

const device = new FasterSerialPort(deviceInfo.path, {
autoOpen: false,
baudRate: 9600,
dataBits: 8,
parity: "none",
stopBits: 1,
});

await device.open();

device.setTimeout(500); // return prematurely from any operation that takes longer than 500ms

function writeData() {
const data = Buffer...

// blocks until write has finished or timeout expires.
// If timeout expires, will throw in format "Timeout writing to port: %d of %d bytes written"
await device.write(data);
}

function waitForKnownDataSize() {

// blocks until the number of bytes specified are read or the timeout expires.
// If timeout expires, will return what ever data has been read.
// Will not throw if timeout expires
const data = await device.read(256);
if(data.length !== 256) throw new Error("missing data");
}

function pollForAnyData() {
device.setTimeout(10);

while(true) {
const data = await device.read(256);