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Joseph Doherty 1f983d610f test(abcip): hw5 hardware gate — #566 idle close drops TCP; native STRING write on Z-35162 (#592 )

A. #566 on a real CompactLogix (Z-35162, read-only): a class-3 connection idled 60 s past its
16 s timeout is closed at the TCP level, not with CIP 0x0107/0x0203; the next request fails on
its write (Broken pipe -> BadConnection) in 9 ms and the one after reopens. The transport already
handles this, so no production behaviour changed; the shape is pinned offline by
CipConnectionTests.A_target_that_resets_an_idle_session_... (FakeEipServer.ResetAllConnections),
proven red with a reconnect-skipping mutation. The diagnostics-only exchange tap now also sees
Forward Open replies (granted RPIs).

B. Native STRING write through the driver on Program:ES03_TemperatureControl._StrTmp: write,
read back, restored byte-exact (user-approved). Array write NOT run: the census's unreferenced
DINT[32] _SEQ_EP arrays are aliased sequencer step registers (raw L5X grep), so none qualifies.
#567 still impossible (a 128 B array / 88 B STRING never fragments).

New env-gated harness: AbCip.IntegrationTests/HardwareGate (IdleConnectionEvidenceTests,
StringWriteGateTests). Docs: gate results (hw5 section + raw output), AbCip.md, CLAUDE.md.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

2026-10-09 06:16:16 -04:00

hw4-listing-order.txt

test(ab): hw4 evidence - mixed MSP read (#582 ), listing order (#572 ) on the press; AbLegacy bit-write test; gate-results + docs

2026-10-09 04:10:22 -04:00

hw4-mix-msp.txt

test(ab): hw4 evidence - mixed MSP read (#582 ), listing order (#572 ) on the press; AbLegacy bit-write test; gate-results + docs

2026-10-09 04:10:22 -04:00

hw5-idle566.txt

test(abcip): hw5 hardware gate — #566 idle close drops TCP; native STRING write on Z-35162 (#592 )

2026-10-09 06:16:16 -04:00

hw5-string-write.txt

test(abcip): hw5 hardware gate — #566 idle close drops TCP; native STRING write on Z-35162 (#592 )