Making my fan work which uses the tuya legacy fan API

[tbratfisch]

These changes make my fan work that uses the legacy API, so the changes are tested using a real device.
I've seen the pull request from @vookimedlo after finishing coding and tested it, but that code doesn't work for me, it looks like the API is reporting wrong values for the legacy API - the API and the documentation are conflicting, see my comments in my changes.

[vookimedlo]

@tbratfisch I will get back to you during the weekend. I am busy right now. I have some comments to your implementation, but I would say we can find a working solution together.

[vookimedlo]

Meanwhile, 1.4.0 changed the implementation of Fan speed - it has broken the Air Purifier support as I described here #228. I closed my original PR #154 because it is no more relevant.

[tetsuo55]

@tbratfisch @vookimedlo @mouth4war

We managed to get my fan speeds working in #490 (at the time I'm writing this there is one change missing in the pr itself but mentioned in the comments).

Now my fan uses another way of setting speeds but this new code should support all 3 speed types

That pr (just fan.py) should also work for your fans, could you test?

[zlinoliver]

Hi @tbratfisch , the Tuya developer team really appreciates your contributions and efforts to this Tuya v2 integration project. As we stop maintaining it now, please help to recreate your pull request in the Home Assistant Core repository: https://github.com/home-assistant/core/tree/dev/homeassistant/components/tuya