Add huawei_lte sensor for number of unread sms

[fphammerle]

Proposed change

Added a sensor counting number of unread SMS via huawei_lte integration.

I'd like to trigger an automation when text messages arrive.

API: https://github.com/Salamek/huawei-lte-api/blob/1.4.12/huawei_lte_api/api/Sms.py#L13

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)
• 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/13454/files

Checklist

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

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

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

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

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

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[homeassistant]

Hi @fphammerle,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[frenck]

Thank you for your contribution thus far! 🎖 Since this is a significant contribution, we would appreciate you'd added yourself to the list of code owners for this integration. ❤️

Please, add your GitHub username to the manifest.json of this integration.

For more information about "code owners", see: Architecture Decision Record 0008: Code owners.

[fphammerle]

Added myself to list of codeowners

I am not sure how to add appropriate docs

The relevant docs page does not yet mention any other sensors:
https://github.com/home-assistant/home-assistant.io/blob/bdb8e5becda29c103302106bdfdbed3f6229efed/source/_integrations/huawei_lte.markdown

Could you maybe give me a hint how to proceed?

[frenck]

That is the correct location @fphammerle.

The fact that it is missing any information about other sensors is an error I would say.

[fphammerle]

Thanks a lot for your immediate answers

I created a small docs PR here: https://github.com/home-assistant/home-assistant.io/pull/13454/files

[frenck]

Thanks, @fphammerle 👍

LGTM ✅