Use it with promises
const { Tello } = require('@giwisoft/ryze-tello-sdk');
const tello = new Tello();
tello.start()
.then(() => tello.takeoff())
.then(() => tello.forward(50))
.then(() => tello.rotateCCW(360))
.then(() => tello.get('h'))
.then(r => console.log('height', r.value, 'cm'))
.then(() => tello.backward(50))
.then(() => tello.land())
.then(() => tello.stop());