U3: both array shapes read fine but every write failed BadInternalError.
String[] now encodes each element at its register width (StringLength chars,
2 per register); BitInRegister[] reads the span once, flips the addressed bit
of each register and writes the span back with FC16 (per-register RMW locks
taken in ascending order). A length mismatch is BadOutOfRange and sends
nothing. DriverArrayWriteSupport (outside this lane) still advertises these
nodes read-only - recorded as follow-up F1 in the parity test.
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
P6: Coils/DiscreteInputs carry only Bool and register regions never Bool;
the factory (and so the deploy-gate Inspect and the AdminUI parse consult)
refuses a mismatch, and an absent dataType defaults per region (Bool for a
bit region). A HoldingRegisters+Bool tag used to throw out of the coalescing
planner and stall every tag of the subscription; the planner also skips any
incompatible pair defensively. The tag editor keeps the type compatible when
the region changes; the CLI refuses the pair up front. The array-write parity
test records the Coils divergence from DriverArrayWriteSupport (owned outside
this lane) as follow-up F1.
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
MAJOR-1: the SDK skips TypeInfo.IsInstanceOfDataType on any node with an
OnWriteValue handler (every writable equipment node), and the node manager's
fail-fast treated numeric<->numeric as compatible, so a UInt32[] to a Galaxy
Int32 array matched MxValueEncoder's int[] arm by CLR covariance and was
written bit-reinterpreted with a Good result. EvaluateEquipmentWriteStructure
now matches an ARRAY write's element type exactly (Byte[]/ByteString the only
equivalence; Variant[]/object[] refused) -> BadTypeMismatch, nothing
dispatched. MxValueEncoder's int[]/long[] arms are exact-type guarded too, and
the Galaxy parity test's false "the SDK refuses" premise is corrected (the
UInt32/UInt64 exclusion is now the encoder's own answer). Scalar writes keep
numeric widening by decision: consumers write CLR-typed values (Double to a
Float node) and every driver's scalar encoder range-checks.
MINOR: Modbus row honours maxRegistersPerWrite (smallest of DriverConfig /
the tag's DeviceConfig, default 123) and FC15's 1968-coil ceiling, and
requires region + numeric address; Modbus/S7/Galaxy require isArray + integer
arrayLength >= 1 (Galaxy: an unbounded node would let a short write resize the
attribute); an array value to a scalar node is refused inline. Docs: Uns.md
array-write rules + upgrade note (ReadWrite array tags become client-writable
on first boot), Modbus.md, Galaxy.md.
Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
Array nodes were forced read-only for every driver. A new single authority,
Core.Abstractions DriverArrayWriteSupport, says which (driver, element type)
pairs encode a whole-array write: Modbus (Coils / numeric HoldingRegisters),
S7 (Byte/Int16/UInt16/Int32/UInt32/Float32), OpcUaClient (pass-through) and
Galaxy (Boolean/Int32/Int64/Float/Double/String/DateTime). Everything else
stays read-only, so the server never advertises a write the driver refuses.
- Composer derives RawTagPlan.ArrayWritable + UnsReferenceVariable
.BackingArrayWritable at compose time (both seams, byte-parity); the
applier's one writability rule is Writable && (!IsArray || ArrayWritable)
for materialise and surgical paths, raw and UNS alike.
- ArrayWritable is on the classifier's surgical raw-tag whitelist and
mirrored on the UNS record (UnsReferenceBackingParityTests updated).
- Node manager refuses a wrong-length / non-array value on an array node
(BadTypeMismatch) and any IndexRange write (BadWriteNotSupported) inline,
before dispatch; WriteOperate/ACL gates and the revert are unchanged.
- Per-driver parity tests pin the table against the real Modbus write path,
S7 EncodeArrayBlock and Galaxy MxValueEncoder (UInt32/UInt64 excluded:
array covariance reinterprets their bits).
- Over-the-wire proof in OpcUaServer.IntegrationTests (ArrayWriteWireTests).
- ValueRank > 1 documented as out of scope by decision (docs/Uns.md).
Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
Joseph Doherty