Fix ESPHome BLE client raising confusing error when not connected

[bdraco]

Proposed change

The @verify_connected decorator should have checked self._is_connected before trying to make the request to the aioesphomeapi lib so it could raise a helpful error instead of hitting an error inside the lib about the connection not being established

It was discovered in #102188 that some libraries will incorrectly reuse the client after the disconnected callback has fired which lead to this state and left the user wondering what had gone wrong.

I cleaned up the logging a bit so it will be more obvious what has gone wrong to developers.

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: Home assistant Bluetooth connections drop and aren't reestablished (ESPHome Bluetooth Proxy) #102188
• Link to documentation pull request:

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• The code change is tested and works locally.
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[home-assistant]

Hey there @OttoWinter, @jesserockz, @kbx81, mind taking a look at this pull request as it has been labeled with an integration (esphome) you are listed as a code owner for? Thanks!

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[frenck]

Thanks, @bdraco 👍

../Frenck

[bdraco]

thanks