Improve device handling for disconnected IronOS devices

[tr4nt0r]

Proposed change

• A Devices' config entry is now set up normally without raising ConfigEntryNotReady even if it is not connected, and its state is shown as unavailable since this device type is mostly disconnected.
• Update entity will now restore the last known installed version from entity store.
• Firmware version and serial number in device info get updated now in coordinator if device was not connected on entry setup or if the fw version has changed.

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:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[balloob]

As limitation of these changes, the DeviceInfo will now lack the serial number, ID, and firmware version, if the device was not connected during config entry setup.

Maybe we can fetch this data when device is discovered, so we can do the setup without having it connected?

[tr4nt0r]

As limitation of these changes, the DeviceInfo will now lack the serial number, ID, and firmware version, if the device was not connected during config entry setup.

Maybe we can fetch this data when device is discovered, so we can do the setup without having it connected?

@balloob I think I found a viable solution. As the firmware version may eventually change i decided to let the coordinator save this information in the config entry.

[home-assistant]

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