WIP feat: Add get_fan_param service for reading fan parameters

[wimpie70]

Hi zxdavb,

First PR to add fan param (2411) features to Ramses_cc. Hope you find time to take a look.
This PR is based on the previous ramses_rf PR #198.

Regards, Willem

Dependencies

• This service depends on the ramses_rf library's get_fan_param method ramses_rf PR #198

Description

This PR adds a new get_fan_param service to the Ramses CC integration, enabling users to read parameter values from fan devices using the 2411 command. The service is implemented as a domain service for simplicity and follows the existing code patterns.

Features

• New ramses_cc.get_fan_param service
• Support for reading fan parameters via the 2411 command
• Flexible parameter ID format (e.g., "4E", "4e", "04", " 4E ")
• Optional from_id parameter (defaults to HGI if not specified)
• Optional fan_id parameter for devices with multiple fans

Implementation Details

• Service handler in broker.py
• Service schema in schemas.py
• Constants in const.py
• Test coverage in tests/tests_new/test_fan_param.py

Key Files Changed

1. custom_components/ramses_cc/broker.py - Service handler implementation
2. custom_components/ramses_cc/schemas.py - Service schema and validation
3. custom_components/ramses_cc/const.py - Service constants
4. tests/tests_new/test_fan_param.py - Test cases for the new service

Testing

• All 25 tests passing in Python 3.13
• Includes unit tests for success and error cases
• Test coverage for parameter validation and command construction
• Compatible with Python 3.11, 3.12, and 3.13 (verified via CI)
• Pre-commit hooks and mypy type checking passing
• Python 3.13: All tests pass successfully
• Python 3.12: Tests fail due to dependency conflict with paho-mqtt
  • pytest-homeassistant-custom-component requires paho-mqtt==1.6.1
  • Python 3.12+ requires paho-mqtt>=2.1.0
  • This is a known limitation of the test dependencies

Python Version Compatibility

• Python 3.13: All tests pass successfully
• Python 3.12: Tests fail due to dependency conflict with paho-mqtt
  • pytest-homeassistant-custom-component requires paho-mqtt==1.6.1
  • Python 3.12+ requires paho-mqtt>=2.1.0
  • This is a known limitation of the test dependencies
• Python 3.11: Tests fail due to the same paho-mqtt dependency conflict

The production code itself is compatible with all Python versions, but the test environment has these limitations due to test dependencies.

Notes

• This is a domain service (no UI help text yet)
• Other features (e.g., setting parameters) will be implemented in a future PR
• Translations and UI improvements can be added later