Turn on a generic USB relay using node-hid, naive approach

relay.js

/**
 * Control a USB relay board using USB.
 *
 * This code helped a lot in the understanding of what they boards
 * expect for hex inputs:
 * https://github.com/jaketeater/Very-Simple-USB-Relay/blob/master/relay.py
 */
const HID = require('node-hid')

const ON = 0xfe
const OFF = 0xfc
const VENDOR_ID = 5824
const PRODUCT_ID = 1503

// convert integer to binary representation
const itob = num => Number(parseInt(num, 10).toString(2))

class Relay {
  constructor() {
    this.device = new HID.HID(VENDOR_ID, PRODUCT_ID)
    if (!this.device) throw new Error('No device found!')
    console.log('CURRENT STATE:', this.getStatus())
  }

  /**
   *
   */
  getStatus() {
    const state = this.device.getFeatureReport(1, 8)[7]
    return itob(state)
  }

  on(delay) {
    this.device.sendFeatureReport([ON, ON])
    if (delay) setTimeout(() => this.off(), delay)
  }

  off() {
    this.device.sendFeatureReport([OFF, OFF])
  }
}

const relay = new Relay()

// Make sure the relay defaults to off
relay.off()

const delay = 1000
relay.on(delay)