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ble-reticulum/migration/reports/fragmentation_cpp_equivalence_20260516_1718.md

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C++ Protocol Core Fragmentation Equivalence Test

Date: 2026-05-16 Host: jp Python environment: rnsenv Repository: /usr/local/src/ble-reticulum

Command

cd /usr/local/src/ble-reticulum
python3 -m pytest migration/tests/test_fragmentation_cpp_equivalence.py -vv
Result

28 tests passed.

Coverage Summary

The C++ implementation was compared against the existing Python implementation for:

BLEFragmenter single-fragment packets
BLEFragmenter multi-fragment packets
MTU boundary sizes: 20, 23, 50, 185
Empty and non-bytes packet errors
BLEReassembler single-fragment reassembly
BLEReassembler multi-fragment reassembly
Out-of-order fragments with start first
Malformed fragments
Duplicate fragments with same data
Duplicate fragments with different data
Stale buffer cleanup
Statistics reset
Internal reassemble behavior
HDLC frame/deframe round trips
Full byte range HDLC round trip
Many HDLC round trips
Invalid HDLC escape sequences and frames
Non-bytes HDLC errors
Raw Result

28 passed, 2 warnings in 0.38s.

Interpretation

This establishes phase-1 behavioral equivalence for the protocol-core fragmentation/reassembly layer. The C++ code is not yet integrated into BLEInterface.py for live Reticulum/BLE traffic.