Joseph Doherty fcf89618cd Auto: twincat-1.3 — bit-indexed BOOL writes (RMW) ...

Replace the NotSupportedException at AdsTwinCATClient.WriteValueAsync
for bit-indexed BOOL writes with a read-modify-write path:

  1. Strip the trailing .N selector from the symbol path.
  2. Read the parent as UDINT.
  3. Set or clear bit N via the standard mask.
  4. Write the parent back.

Concurrent bit writers against the same parent serialise through a
per-parent SemaphoreSlim cached in a ConcurrentDictionary (never
removed — bounded by writable-bit-tag cardinality). Mirrors the AbCip /
Modbus / FOCAS bit-RMW pattern shipped in #181 pass 1.

The path-stripping (TryGetParentSymbolPath) and mask helper (ApplyBit)
are exposed as internal statics so tests can pin the pure logic without
needing a real ADS target. The FakeTwinCATClient mirrors the same RMW
semantics so driver-level round-trip tests assert the parent-word state.

Closes #307

2026-04-25 17:22:59 -04:00

5.8 KiB

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