Fix partner S7 Communication Setup and bsend/brecv PDU format#669

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gijzelaerr wants to merge 9 commits intomasterfrom

fix-partner-s7-setup

Commits on Apr 5, 2026

Fix BSend PDU format to match PBC protocol expected by S7-1500

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Commits on Apr 6, 2026

Fix BSend PDU to match PBC format verified against real S7-1500

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claude
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Implement async receive path for Partner

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claude
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Fix race condition in wait_as_b_recv_completion

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Commits on Apr 7, 2026

Fix ACK to echo PDU reference and match PLC expected format

gijzelaerr
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claude
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