Add Flexit bacnet integration

[piotrbulinski]

Proposed change

New integration for Flexit Nordic air handling units using built-in BACnet support. Existing 'flexit' integration requires an additional Modbus adapter installed, so this is simpler and cheaper to use.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New integration (thank you!)
• [ ] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: https://github.com/home-assistant/home-assistant.io/pull/26670

Checklist

• [x] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
• [x] I have followed the development checklist
• [x] I have followed the perfect PR recommendations
• [x] The code has been formatted using Black (black --fast homeassistant tests)
• [x] Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• [x] Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• [x] The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• [x] New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• [x] For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
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To help with the load of incoming pull requests:

• [x] I have reviewed two other open pull requests in this repository.

[lellky]

I have successfully tested this PR locally with my Flexit Nordic S4.

(we should add the flexit logo here, but it's a different repo)

Great work Piotr!

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[piotrbulinski]

@Lash-L @frenck thanks for the valuable feedback! I tried to address most of it today, but still need to work on the tests and type hints support, but that's probably later this week.

[lellky]

What's the status here? Do you need any help? Would be awesome to get this merged! 🚀

[lellky]

Hi guys!

I'm eager to get this feature in my Home Assistant as I have one of those Flexit units.

There seems to be so little left to do here to get it merged. @piotrbulinski have you looked at the suggestions by @frenck ? I would really like to help, but I don't really understand the request for change made.

Cheers,

Lellky

[piotrbulinski]

@lellky I believe I addressed all of the feedback from @frenck and @Lash-L, so now it's back for another round of reviews.

[AlfHou]

Any estimates for when this will be merged? Really looking forward to it

[piotrbulinski]

I replaced Home Assistant in my house with another solution, so won't be available to work on this PR/feature any more.

Feel free to fork code from my GitHub and pursue the journey of adding it to HA, just make sure to remove me as code owner from the manifest.

[AlfHou]

Thank you for your efforts. What did you replace it with?

[lellky]

😭

[piotrbulinski]

@AlfHou I'm using the new Homey Pro - my plan is to implement the Flexit Nordic integration in there.

[lellky]

@AlfHou I'm using the new Homey Pro - my plan is to implement the Flexit Nordic integration in there.

This is really sad for Home Assistant, and for it's users 😢 . I really hope that we can learn something from this.

@piotrbulinski good luck with Homey Pro and thank you for your contribution (and especially for your BACnet library, I use it everyday).