Merge V2.15-develop into main

[oxesoft]

Summary

• Promotes 163 commits from v2.15-develop into main, covering the v2.15+spring2026 release line (Matter 1.6 SVE) plus subsequent fixes.
• Highlights: Matter 1.6 SVE v2.15-beta3.1, NFC commissioning support (Wi-Fi and Thread), Camera/WebRTC features, Python test framework improvements, and multiple import/module fixes (Fix ModuleNotFoundError - matter.testing.CommissioningPreTest #316, Fix ImportError for CommissionDeviceTest in test_harness_client #312, Fix TC_DD_3_24 hang on user prompt timeout in _show_prompt_request #308).

Test plan

• CI passes on the PR
• Smoke test the Test Harness against a representative DUT
• Verify v2.15+spring2026 version is reported correctly

[gemini-code-assist]

Code Review

This pull request introduces comprehensive updates to the test harness, including project export/import functionality, CLI-driven test executions with configuration overrides, and real-time Python test logging. It expands communication capabilities with new WebSocket endpoints for video relay and WebRTC signaling, optimizes test discovery through shared container sessions, and updates the Matter SDK integration. Technical feedback highlights critical bugs in the new Docker file-transfer utilities regarding tar archive handling, an exception shadowing issue in the PICS processing logic that prevents proper error catching, and a concurrency bottleneck in the video relay service caused by a hardcoded UDP port.

[gemini-code-assist]

The custom FileNotFoundError exception shadows the built-in Python FileNotFoundError. Since the custom exception does not inherit from the built-in one, the except FileNotFoundError: block at line 81 will fail to catch the exception raised by open() when a file is missing. This results in the built-in exception propagating unhandled by this specific block. It is recommended to rename the custom exception to avoid shadowing.

Suggested change

	class FileNotFoundError(PlatformTestError):
	"""Exception raised when test file is not found"""
	pass
	class PlatformFileNotFoundError(PlatformTestError):
	"""Exception raised when test file is not found"""
	pass

[gemini-code-assist]

This block should catch the built-in FileNotFoundError and raise the custom one defined earlier (after renaming it to avoid shadowing).

Suggested change

	except FileNotFoundError:
	raise FileNotFoundError(f"File {platform_tests_file} not found")
	except FileNotFoundError:
	raise PlatformFileNotFoundError(f"File {platform_tests_file} not found")

[gemini-code-assist]

The copy_file_from_container method writes the raw tar stream returned by container.get_archive directly to the destination file. Docker's get_archive API returns a tar archive, so the resulting file on the host will be a tarball containing the requested file, rather than the file's actual content. The stream should be processed using the tarfile module to extract the specific file content before writing it to the host.

[gemini-code-assist]

The copy_file_to_container method attempts to open the host file as a tar archive (tarfile.open(..., mode="r")). If the host file is a regular file (e.g., a .json or .txt file), this will raise a tarfile.ReadError. To copy a regular file, the method should create a new tar archive in memory and add the file to it before calling put_archive.

[gemini-code-assist]

The video relay logic binds to a hardcoded UDP port (5000). This implementation prevents multiple concurrent video streams because only one socket can bind to a specific port at a time. If multiple clients attempt to access the video stream simultaneously, subsequent connections will fail with an 'Address already in use' error. Consider using dynamic port allocation or a port pool.

[oxesoft]

Closing in favor of a merge branch that resolves squash-artifact conflicts against main. See replacement PR.