Homebridge characteristic warnings
**Describe The Bug:**

Not really a bug, but rather an annoying warning message that the Hue, Color Temp, Saturation, and Brightness characteristics aren't being properly defined.

**To Reproduce:**

Add a MSL-120 bulb, and open the Home app.

**Expected behavior:**

Not throw warnings, properties should be properly defined and set.

**Logs:**

[3/14/2021, 11:24:02 PM] [homebridge-meross] This plugin generated a warning from the characteristic 'Hue': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.
[3/14/2021, 11:24:02 PM] [homebridge-meross] This plugin generated a warning from the characteristic 'Color Temperature': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.
[3/14/2021, 11:24:02 PM] [homebridge-meross] This plugin generated a warning from the characteristic 'Saturation': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.
[3/14/2021, 11:24:02 PM] [homebridge-meross] This plugin generated a warning from the characteristic 'Brightness': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.

# **Environment:**

- **Node.js Version**: v14.16.0
- **NPM Version**: v6.14.11
- **Homebridge Version**: v1.3.3
- **Homebridge Meross Plugin Version**: v4.0.1
- **Homebridge Config UI X Plugin Version**: v4.40.0
- **Operating System**: Docker Alpine v3.12.4
