Script to a control a SwitchBot device without depending on gatttool

switchbot.js

const noble = require('@abandonware/noble');

const address = '';
const uuidPrimary = 'cba20d00224d11e69fb80002a5d5c51b';
const uuidWrite = 'cba20002224d11e69fb80002a5d5c51b';

noble.on('stateChange', state => {
  if (state === 'poweredOn') {
    noble.startScanning([uuidPrimary], false);
  } else {
    noble.stopScanning();
  }
});

noble.on('discover', peripheral => {
  if (peripheral.address === idOrAddress) {
    noble.stopScanning();

    const advertisement = peripheral.advertisement;
    const serviceData = advertisement.serviceData;
    const buf = serviceData[0].data;
    const byte1 = buf.readUInt8(1);
    const state = byte1 & 0b01000000 ? true : false;

    console.log('SwitchBot state:', state);
    writeCharacterstic(peripheral, state);
  }
});

function writeCharacterstic(peripheral, state) {
  peripheral.on('disconnect', () => {
    process.exit(0);
  });

  peripheral.connect(error => {
    peripheral.discoverAllServicesAndCharacteristics((error, services, chars) => {
        chars.forEach(char => {
          if (char.uuid === uuidWrite) {
            const off = new Buffer.from('570101', 'hex');
            const on = new Buffer.from('570102', 'hex');
            const cmd = state ? off : on;

            console.log('Turning light', state ? 'off' : 'on');
            char.write(cmd, false, error => {
              peripheral.disconnect();
            });
          }
        });
      }
    );
  });
}