Support for Xiaomi Air purifier 3C

[arturdobo]

Device information:

• Name(s) of the device: Xiaomi Air purifier 3C

Use miiocli device --ip <ip address> --token <token>.

• Model: zhimi.airpurifier.mb4
• Hardware version: esp32
• Firmware version: 2.0.8

Additional context

After a quick investigation, it looks like the specification for Xiaomi Air purifier 3C is a little bit different than the one used currently for air purifiers and only a few of properties match. As a result, it causes -4005 code on the majority of fields.

I could prepare some PR to solve that issue, but I'm new in this area and I'd like to confirm whether the way the similar issue has been resolved here is a good way to follow?

[arturdobo]

Air Purifier 3C supports only a subset of current features declared in AirPurifierMiot. The model needs to be split into two separated ones I believe but I'd like to consult whether my proposal I started work on https://github.com/arturdobo/python-miio/commit/6c911e37d1005f9235fa5d3c6856655d40e4263d is something acceptable or not. If not, could you give me some idea of how to do this? And more thing, I'm not a Python developer, so I don't if my code is idiomatic or not 😛

[arturdobo]

Because of no feedback for 3 weeks, I created #899 for that change

[calas80]

Hi,

I have this device, I am very much waiting for an update.

Thanks for this pluging.

[rytilahti]

This has been implemented in #899, thanks to @arturdobo! 🎉