Add connectivity mode diagnostics sensor for Airthings BLE

[LaStrada]

Breaking change

Proposed change

Add a connectivity mode sensor. This is part of fixing this bug:
Airthings/airthings-ble#61
The new Corentium Home 2 will disconnect if wrong connectivity mode is set. Adding a sensor to present this to the user.

Supported values are:

• SmartLink (which is the name of our hub functionality)
• Bluetooth
• Unknown (if we can't read it for some reason)

I separated this from this branch/PR to make that one smaller, and is not really needed for the November release.
#155444

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• 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:
• Link to developer documentation pull request:
• Link to frontend pull request:

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[home-assistant]

Hey there @vincegio, mind taking a look at this pull request as it has been labeled with an integration (airthings_ble) you are listed as a code owner for? Thanks!

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[Copilot]

Pull Request Overview

This PR adds support for a new connectivity_mode sensor to the Airthings BLE integration. The sensor shows the connection mode (e.g., "Bluetooth") and is disabled by default.

Key changes:

• Added a new connectivity_mode sensor entity with diagnostic category, disabled and hidden by default
• Added translation key for the new sensor in strings.json
• Added test data for Corentium Home 2 device including the connectivity_mode sensor
• Added comprehensive test coverage for disabled sensor translation behavior
• Fixed an incorrect device constant reference in an existing test

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
homeassistant/components/airthings_ble/sensor.py	Added connectivity_mode sensor entity description with diagnostic category, disabled and hidden by default
homeassistant/components/airthings_ble/strings.json	Added translation key for connectivity_mode sensor
tests/components/airthings_ble/__init__.py	Added CORENTIUM_HOME_2_SERVICE_INFO and CORENTIUM_HOME_2_DEVICE_INFO test fixtures; added connectivity_mode to WAVE_ENHANCE_DEVICE_INFO
tests/components/airthings_ble/test_sensor.py	Renamed test function for clarity, fixed device constant reference bug, added new test for disabled sensor translation behavior, added new imports

[joostlek]

So there are 3 modes right? Let's make this an enum sensor and add the values (ideally snake_case so we can translate the states) to the options and then HA knows what values it could be

[LaStrada]

It's 3, plus the Unknown state. That should not happen, and I realise now that it should then be None instead, and then just ignore it instead of showing Unknown.

Should I create a new enum here? Or reuse the one from the library?

If I reuse it, HA is not the "source of truth" and the values could change, meaning the translations keys could be wrong.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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