fix: parse SZL 0x0011 records properly for S7-1500 - #789
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Real S7-1500 PLCs include a partial-list header (LengthDR + NDR) and per-record index fields in SZL 0x0011 responses. The previous code used hardcoded offsets that only worked when the MLFB started at byte 0. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
get_order_code()returning empty/corrupted data on S7-1500 CPUs (regression in pure Python 3.x)parse_order_code_szlnow properly parses the SZL partial-list header (LengthDR + NDR) and iterates through records to find the first non-empty MLFBCloses #783
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