A little script to turn off a Tuya plug,

turn-off-tuya-plug.js

const TuyAPI = require('tuyapi');

const device = new TuyAPI({
  id: 'XXXXXXXXXXXXXXXXXXXX',
  key: 'XXXXXXXXXXXXXXXX'});

let stateHasChanged = false;

// Find device on network
device.find().then(() => {
  device.connect();
});

// Add event listeners
device.on('connected', () => {
  console.log('Connected to device!');
});

device.on('disconnected', () => {
  console.log('Disconnected from device.');
});

device.on('error', error => {
  console.log('Error!', error);
});

device.on('data', data => {
  //console.log('Data from device:', data.dps['1']);

  if (!data.dps['1']) {
    console.log('The printer is already off!');
  } else {
    console.log('The printer is on. Turning it off.');

        if (!stateHasChanged) {
          device.set({set: false});
      stateHasChanged = true;
    }
  }
});

setTimeout(() => { device.disconnect(); }, 5000);