- Updated the `BaseDevice` class constructor to accept an optional `name` parameter for better context in error messages.
- Improved the `_validate_contract` method to raise an `OxiAPIError` with a descriptive message if the node is not found.
- Modified the `_run_ttp` method to include a check for node existence, returning `None` if not found.
- Changed the test file name in the `Eltex` model to reflect a more descriptive context for testing node not found scenarios.
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