Air Purifier Sensor data is undefined about miio

[Bluebie]

TypeError: Cannot read property 'then' of undefined at Object.<anonymous> means '.promise' doesn't exist. when you have .promise, you get undefined, and when you try to run .then() on that, you get the typeerror. getProperties returns a regular object, not something you can get a promise on. It returns the data immediately.

var value = device.getProperties([ 'aqi', 'temp_dec', 'humidity' ])
console.log(value)

should output something like:

{
  "aqi": 3,
  "temp_dec": 20,
  "humidity": 50
}

(just guessing at values)

[aholstenson]

As commented before, getProperties does not return a Promise. Instead it returns the previously loaded properties, using names as defined by the type of device. Refer to the documentation for details about the properties available.

If you want to load properties from the device using the internal names you can use loadProperties(arrayWithNames) to do so.

In addition, please do not use createDevice unless you have a use case where you need it. If your use case actually requires it, you have to call init and wait for it to resolve before doing anything else with the device. It is recommended to use miio.device() instead which will resolve the correct model and initialize the device before resolving its promise.