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openthread/tests
Jonathan Hui 422a649919 [nexus] add MATN-TC-19 test case for multicast registration by MTD (#12707)
This commit implements the Thread 1.2 test MATN-TC-19: Multicast
registration by MTD in the Nexus simulation framework. The test
verifies that an MTD can correctly register multicast addresses
through a parent Thread Router and receive multicast traffic from
the backbone.

Key implementation details:
- Created test_1_2_MATN_TC_19.cpp to simulate the network topology
  (BR_1, BR_2, Router, MTD, and Host) and execute the test steps
  using direct method calls.
- Implemented verify_1_2_MATN_TC_19.py for PCAP-based verification
  of MLE Child Update exchanges, MLR registrations, and multicast
  ICMPv6 Echo Request/Reply forwarding.
- Configured the test to use Note log level and included 1-line
  log output for each step to match existing Nexus tests.
- Integrated the new test into the Nexus build system via
  CMakeLists.txt and added it to the default test execution list
  in run_nexus_tests.sh.
2026-03-17 18:05:10 -05:00
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