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Jonathan Hui
516472c1b5
This commit migrates the cert test script to the Nexus simulation framework. The new Nexus test covers: - Initial key sequence counter and default key switch guard time. - Dynamic updates of the key rotation time via Operational Dataset and verification of the 93% guard time calculation rule. - Automatic key rotation after the rotation time interval expires. - Verification that the key switch guard time correctly prevents nodes from updating their key sequence counter prematurely when receiving MLE messages with a higher sequence. - Continued communication (ICMP Echo) between nodes even when key sequences are temporarily mismatched due to the guard timer. The original Python test script is removed as its functionality is now fully covered by the new Nexus test.