Monitor when an appliance turns on/off using a Tuya compatible (Smart Life and a bunch of other brands) smart plug

washing_machine_monitor.js

const axios = require('axios')
const TuyAPI = require('tuyapi');

var connected = false;
var washerWasOn = false;

// follow these instructions to get the key and id for your plug:
// https://github.com/AMoo-Miki/homebridge-tuya-lan/wiki/Setup-Instructions
const washer = new TuyAPI({
  id: 'YOUR ID',
  key: 'YOUR KEY'
});

washer.on('data', data => {
  var power = data.dps['5'];

  if (power !== undefined) {
    // for light bulbs, the power is zero when the bulb is off
    // some appliances draw more power when they're off, so adjust accordingly
    // my washer draw is around 20 when it is idle. Seems high ...
    var washerIsOn = power > 30;
    console.log("washer is " + (washerIsOn ? 'on' : 'off') + " (" + power + ")");

    if (washerWasOn && !washerIsOn) {
      console.log("washer is done");

      // I use the NotifyMe skill to send the notification to the Echo
      // you could also use a custom skill and the ProactiveEvents API, 
      // but at the time this was written, the API was terrible 
      axios.post('https://api.notifymyecho.com/v1/NotifyMe', {
        notification: "Washy washy washy washy washy washy washy washy washy washy washy washy",
        accessCode: "YOUR ACCESS CODE"
      })
    }

    washerWasOn = washerIsOn;
  }
});

washer.on('connected', () => connected = true);

washer.on('error', error => {
  connected = false;
  console.log(error);
});

var connect = setInterval(() => {
  if (connected == false) {
    console.log('Connecting ...');
    washer
      .find()
      .then(() => washer.connect())
      .catch(console.log);
  }
}, 5_000);

// only one socket can be connected to the plug at a time, 
// so make sure to disconnect before exiting
var exit = () => {
  console.log("\nDisconnecting ...");
  clearInterval(connect);
  washer.disconnect();
  process.exit();
}

process.on('SIGINT', exit);
process.on('SIGTERM', exit);