Block a user
Bit-in-word RMW pass 1 � Modbus + FOCAS
Bit-in-word RMW pass 1 � Modbus + FOCAS
8c309aebf3
RMW pass 1 — Modbus BitInRegister + FOCAS PMC Bit write paths. First half of task #181 — the two drivers where read-modify-write is a clean protocol-level insertion (Modbus FC03/FC06 round-trip + FOCAS pmc_rdpmcrng / pmc_wrpmcrng round-trip). Per-driver SemaphoreSlim registry keyed on the parent word address serialises concurrent bit writes so two writers targeting different bits in the same word don't lose one another's update. Modbus — ModbusDriver gains WriteBitInRegisterAsync + _rmwLocks ConcurrentDictionary. WriteOneAsync routes BitInRegister (HoldingRegisters region only) through RMW ahead of the normal encode path. Read uses FC03 Read Holding Registers for 1 register at tag.Address, bit-op on the returned ushort via (current | 1<<bit) for set / (current & ~(1<<bit)) for clear, write back via FC06 Write Single Register. Per-address lock prevents concurrent bit writes to the same register from racing. Rejects out-of-range bits (0-15) with InvalidOperationException. EncodeRegister's BitInRegister branch repurposed as a defensive guard — if a non-RMW caller ever reaches it, throw so an unintended bypass stays loud rather than silently clobbering. FOCAS — FwlibFocasClient gains WritePmcBitAsync + _rmwLocks keyed on {addrType}:{byteAddr}. Driver-layer WriteAsync routes Bit writes with a bitIndex through the new path; other Pmc writes still hit the direct pmc_wrpmcrng path. RMW uses cnc_rdpmcrng + Byte dataType to grab the parent byte, bit-op with (current | 1<<bit) or (current & ~(1<<bit)), cnc_wrpmcrng to write back. Rejects out-of-range bits (0-7, FOCAS PMC bytes are 8-bit) with InvalidOperationException. EncodePmcValue's Bit branch now treats a no-bitIndex case as whole-byte boolean (non-zero / zero); bitIndex-present writes never hit this path because they dispatch to WritePmcBitAsync upstream. Tests — 5 new ModbusBitRmwTests + 4 new FocasPmcBitRmwTests + 1 renamed pre-existing test each covering — bit set preserves other bits, bit clear preserves other bits, concurrent bit writes to same word/byte compose correctly (8-parallel stress), bit writes on different parent words proceed without contention (4-parallel), sequential bit sets compose into 0xFF after all 8. Fake PmcRmwFake in FOCAS tests simulates the PMC byte storage + surfaces it through the IFocasClient contract so the test asserts driver-level behavior without needing Fwlib32.dll. FwlibNativeHelperTests.EncodePmcValue_Bit_throws_NotSupported_for_RMW_gap replaced with EncodePmcValue_Bit_without_bit_index_writes_byte_boolean reflecting the new behavior. ModbusDataTypeTests.BitInRegister_write_is_not_supported_in_PR24 renamed to BitInRegister_EncodeRegister_still_rejects_direct_calls; the message assertion updated to match the new defensive message. Modbus tests now 182/182, FOCAS tests now 119/119; full solution builds 0 errors; AbCip/AbLegacy/TwinCAT untouched (those get their RMW pass in a follow-up since libplctag bit access may need a parallel parent-word handle). Task #181 stays pending until that second pass lands.
TwinCAT symbol browser via SymbolLoaderFactory
c95228391d
TwinCAT follow-up — Symbol browser via AdsClient + SymbolLoaderFactory. Closes task #188. Adds ITwinCATClient.BrowseSymbolsAsync — IAsyncEnumerable yielding TwinCATDiscoveredSymbol (InstancePath + mapped TwinCATDataType + ReadOnly flag) from the target's flat symbol table. AdsTwinCATClient implementation uses SymbolLoaderFactory.Create(_client, new SymbolLoaderSettings(SymbolsLoadMode.Flat)) + iterates loader.Symbols, maps IEC 61131-3 type names (BOOL/SINT/INT/DINT/LINT/REAL/LREAL/STRING/WSTRING/TIME/DATE/DT/TOD + BYTE/WORD/DWORD/LWORD unsigned-word aliases) through MapSymbolTypeName, checks SymbolAccessRights.Write bit for writable vs read-only. Unsupported types (UDTs / function blocks / arrays / pointers) surface with DataType=null so callers can skip or recurse. TwinCATDriverOptions.EnableControllerBrowse — new bool, default false to preserve the strict-config path. When true, DiscoverAsync iterates each device's BrowseSymbolsAsync, filters via TwinCATSystemSymbolFilter (rejects TwinCAT_*, Constants.*, Mc_*, __*, Global_Version* prefixes + anything empty), skips null-DataType symbols, emits surviving symbols under a per-device Discovered/ sub-folder with InstancePath as both FullName + BrowseName + ReadOnly→ViewOnly/writable→Operate. Pre-declared tags from TwinCATDriverOptions.Tags always emit regardless. Browse failure is non-fatal — exception caught + swallowed, pre-declared tags stay in the address space, operators see the failure in driver health on next read. TwinCATSystemSymbolFilter static class mirrors AbCipSystemTagFilter's shape with TwinCAT-specific prefixes. Fake client updated — BrowseResults list for test setup + FireNotification-style single-invocation on each subscribe, ThrowOnBrowse flag for failure testing. 8 new unit tests — strict path emits only pre-declared when EnableControllerBrowse=false, browse enabled adds Discovered/ folder, filter rejects system prefixes, null-DataType symbols skipped, ReadOnly symbols surface ViewOnly, browse failure leaves pre-declared intact, SystemSymbolFilter theory (10 cases). Total TwinCAT unit tests now 110/110 passing (+17 from the native-notification merge's 93); full solution builds 0 errors; other drivers untouched.
TwinCAT symbol browser via SymbolLoaderFactory
c95228391d
TwinCAT follow-up — Symbol browser via AdsClient + SymbolLoaderFactory. Closes task #188. Adds ITwinCATClient.BrowseSymbolsAsync — IAsyncEnumerable yielding TwinCATDiscoveredSymbol (InstancePath + mapped TwinCATDataType + ReadOnly flag) from the target's flat symbol table. AdsTwinCATClient implementation uses SymbolLoaderFactory.Create(_client, new SymbolLoaderSettings(SymbolsLoadMode.Flat)) + iterates loader.Symbols, maps IEC 61131-3 type names (BOOL/SINT/INT/DINT/LINT/REAL/LREAL/STRING/WSTRING/TIME/DATE/DT/TOD + BYTE/WORD/DWORD/LWORD unsigned-word aliases) through MapSymbolTypeName, checks SymbolAccessRights.Write bit for writable vs read-only. Unsupported types (UDTs / function blocks / arrays / pointers) surface with DataType=null so callers can skip or recurse. TwinCATDriverOptions.EnableControllerBrowse — new bool, default false to preserve the strict-config path. When true, DiscoverAsync iterates each device's BrowseSymbolsAsync, filters via TwinCATSystemSymbolFilter (rejects TwinCAT_*, Constants.*, Mc_*, __*, Global_Version* prefixes + anything empty), skips null-DataType symbols, emits surviving symbols under a per-device Discovered/ sub-folder with InstancePath as both FullName + BrowseName + ReadOnly→ViewOnly/writable→Operate. Pre-declared tags from TwinCATDriverOptions.Tags always emit regardless. Browse failure is non-fatal — exception caught + swallowed, pre-declared tags stay in the address space, operators see the failure in driver health on next read. TwinCATSystemSymbolFilter static class mirrors AbCipSystemTagFilter's shape with TwinCAT-specific prefixes. Fake client updated — BrowseResults list for test setup + FireNotification-style single-invocation on each subscribe, ThrowOnBrowse flag for failure testing. 8 new unit tests — strict path emits only pre-declared when EnableControllerBrowse=false, browse enabled adds Discovered/ folder, filter rejects system prefixes, null-DataType symbols skipped, ReadOnly symbols surface ViewOnly, browse failure leaves pre-declared intact, SystemSymbolFilter theory (10 cases). Total TwinCAT unit tests now 110/110 passing (+17 from the native-notification merge's 93); full solution builds 0 errors; other drivers untouched.
1d6015bc87
FOCAS PR 3 — ITagDiscovery + ISubscribable + IHostConnectivityProbe + IPerCallHostResolver. Completes the FOCAS driver — 7-interface capability set matching AbCip/AbLegacy/TwinCAT (minus IAlarmSource — Fanuc CNC alarms live in a different API surface, tracked as a future-phase concern). ITagDiscovery emits pre-declared tags under a FOCAS root + per-device sub-folder keyed on the canonical focas://host:port string with DeviceName fallback. Writable → Operate, non-writable → ViewOnly. No native FOCAS symbol browsing — CNCs don't expose a tag catalogue the way Logix or TwinCAT do; operators declare addresses explicitly. ISubscribable consumes the shared PollGroupEngine — 5th consumer of the engine after Modbus + AbCip + AbLegacy + TwinCAT-poll-mode. 100ms interval floor inherited. FOCAS has no native notification/subscription protocol (unlike TwinCAT ADS), so polling is the only option — every subscribed tag round-trips through cnc_rdpmcrng / cnc_rdparam / cnc_rdmacro on each tick. IHostConnectivityProbe uses the existing IFocasClient.ProbeAsync which in the real FwlibFocasClient calls cnc_statinfo (cheap handshake returning ODBST with tmmode/aut/run/motion/alarm state). Probe loop runs when Enabled=true, catches OperationCanceledException during shutdown, falls through to Stopped on exceptions, emits Running/Stopped transitions via OnHostStatusChanged with the canonical focas://host:port as the host-name key. Same-state spurious-event guard under per-device lock. IPerCallHostResolver maps tag full-ref to DeviceHostAddress for Phase 6.1 bulkhead/breaker keying per plan decision #144 — unknown refs fall back to first device, no devices → DriverInstanceId. ShutdownAsync now disposes PollGroupEngine + cancels/disposes per-device probe CTS + disposes cached clients. DeviceState gains ProbeLock / HostState / HostStateChangedUtc / ProbeCts matching the shape used by AbCip/AbLegacy/TwinCAT. 9 new unit tests in FocasCapabilityTests — discovery tag emission with correct SecurityClassification, subscription initial poll raises OnDataChange, shutdown cancels subscriptions, GetHostStatuses entry-per-device, probe Running / Stopped transitions, ResolveHost for known / unknown / no-devices paths. FocasScaffoldingTests updated with Probe.Enabled=false where the default factory would otherwise try to load Fwlib32.dll during the probe-loop spinup. Total FOCAS unit tests now 115/115 passing (+9 from PR 2's 106); full solution builds 0 errors; Modbus / AbCip / AbLegacy / TwinCAT / other drivers untouched. FOCAS driver is real-wire-capable end-to-end — read / write / discover / subscribe / probe / host-resolve for Fanuc FS 0i/16i/18i/21i/30i/31i/32i/Series 35i/Power Mate i controllers once deployment drops Fwlib32.dll beside the server. Closes task #120 subtask FOCAS.
FOCAS PR 3 � Discovery + Subscribe + Probe + HostResolver
FOCAS PR 3 � Discovery + Subscribe + Probe + HostResolver
1d6015bc87
FOCAS PR 3 — ITagDiscovery + ISubscribable + IHostConnectivityProbe + IPerCallHostResolver. Completes the FOCAS driver — 7-interface capability set matching AbCip/AbLegacy/TwinCAT (minus IAlarmSource — Fanuc CNC alarms live in a different API surface, tracked as a future-phase concern). ITagDiscovery emits pre-declared tags under a FOCAS root + per-device sub-folder keyed on the canonical focas://host:port string with DeviceName fallback. Writable → Operate, non-writable → ViewOnly. No native FOCAS symbol browsing — CNCs don't expose a tag catalogue the way Logix or TwinCAT do; operators declare addresses explicitly. ISubscribable consumes the shared PollGroupEngine — 5th consumer of the engine after Modbus + AbCip + AbLegacy + TwinCAT-poll-mode. 100ms interval floor inherited. FOCAS has no native notification/subscription protocol (unlike TwinCAT ADS), so polling is the only option — every subscribed tag round-trips through cnc_rdpmcrng / cnc_rdparam / cnc_rdmacro on each tick. IHostConnectivityProbe uses the existing IFocasClient.ProbeAsync which in the real FwlibFocasClient calls cnc_statinfo (cheap handshake returning ODBST with tmmode/aut/run/motion/alarm state). Probe loop runs when Enabled=true, catches OperationCanceledException during shutdown, falls through to Stopped on exceptions, emits Running/Stopped transitions via OnHostStatusChanged with the canonical focas://host:port as the host-name key. Same-state spurious-event guard under per-device lock. IPerCallHostResolver maps tag full-ref to DeviceHostAddress for Phase 6.1 bulkhead/breaker keying per plan decision #144 — unknown refs fall back to first device, no devices → DriverInstanceId. ShutdownAsync now disposes PollGroupEngine + cancels/disposes per-device probe CTS + disposes cached clients. DeviceState gains ProbeLock / HostState / HostStateChangedUtc / ProbeCts matching the shape used by AbCip/AbLegacy/TwinCAT. 9 new unit tests in FocasCapabilityTests — discovery tag emission with correct SecurityClassification, subscription initial poll raises OnDataChange, shutdown cancels subscriptions, GetHostStatuses entry-per-device, probe Running / Stopped transitions, ResolveHost for known / unknown / no-devices paths. FocasScaffoldingTests updated with Probe.Enabled=false where the default factory would otherwise try to load Fwlib32.dll during the probe-loop spinup. Total FOCAS unit tests now 115/115 passing (+9 from PR 2's 106); full solution builds 0 errors; Modbus / AbCip / AbLegacy / TwinCAT / other drivers untouched. FOCAS driver is real-wire-capable end-to-end — read / write / discover / subscribe / probe / host-resolve for Fanuc FS 0i/16i/18i/21i/30i/31i/32i/Series 35i/Power Mate i controllers once deployment drops Fwlib32.dll beside the server. Closes task #120 subtask FOCAS.
dohertj2
created branch focas-pr3-remaining-capabilities in dohertj2/lmxopcua
2026-04-19 20:01:11 -04:00
a2c7fda5f5
FOCAS PR 2 — IReadable + IWritable + real FwlibFocasClient P/Invoke. Closes task #193 early now that strangesast/fwlib provides the licensed DLL references. Skips shipping with the Unimplemented stub as the default — FwlibFocasClientFactory is now the production default, UnimplementedFocasClientFactory stays as an opt-in for tests/deployments without FWLIB access. FwlibNative — narrow P/Invoke surface for the 7 calls the driver actually makes: cnc_allclibhndl3 (open Ethernet handle), cnc_freelibhndl (close), pmc_rdpmcrng + pmc_wrpmcrng (PMC range I/O), cnc_rdparam + cnc_wrparam (CNC parameters), cnc_rdmacro + cnc_wrmacro (macro variables), cnc_statinfo (probe). DllImport targets Fwlib32.dll; deployment places it next to the executable or on PATH. IODBPMC/IODBPSD/ODBM/ODBST marshaled with LayoutKind.Sequential + Pack=1 + fixed byte-array unions (avoids LayoutKind.Explicit complexity; managed-side BitConverter extracts typed values from the byte buffer). Internal helpers FocasPmcAddrType.FromLetter (G=0/F=1/Y=2/X=3/A=4/R=5/T=6/K=7/C=8/D=9/E=10 per Fanuc FOCAS/2 spec) + FocasPmcDataType.FromFocasDataType (Byte=0 / Word=1 / Long=2 / Float=4 / Double=5) exposed for testing without the DLL loaded. FwlibFocasClient is the concrete IFocasClient backed by P/Invoke. Construction is licence-safe — .NET P/Invoke is lazy so instantiating the class does NOT load Fwlib32.dll; DLL loads on first wire call (Connect/Read/Write/Probe). When missing, calls throw DllNotFoundException which the driver surfaces as BadCommunicationError via the normal exception path. Session-scoped handle from cnc_allclibhndl3; Dispose calls cnc_freelibhndl. Dispatch on FocasAreaKind — Pmc reads use pmc_rdpmcrng with the right ADR_* + data-type codes + parses the union via BinaryPrimitives LittleEndian, Parameter reads use cnc_rdparam + IODBPSD, Macro reads use cnc_rdmacro + compute scaled double as McrVal / 10^DecVal. Write paths mirror reads. PMC Bit writes throw NotSupportedException pointing at task #181 (read-modify-write gap — same as Modbus / AbCip / AbLegacy / TwinCAT). Macro writes accept int + pass decimal-point count 0 (decimal precision writes are a future enhancement). Probe calls cnc_statinfo with ODBST result. Driver wiring — FocasDriver now IDriver + IReadable + IWritable. Per-device connection caching via EnsureConnectedAsync + DeviceState.Client. ReadAsync/WriteAsync dispatch through the injected IFocasClient — ordered snapshots preserve per-tag status, OperationCanceledException rethrows, FormatException/InvalidCastException → BadTypeMismatch, OverflowException → BadOutOfRange, NotSupportedException → BadNotSupported, anything else → BadCommunicationError + Degraded health. Connect-failure disposes the half-open client. ShutdownAsync disposes every cached client. Default factory switched — constructor now defaults to FwlibFocasClientFactory (backed by real Fwlib32.dll) rather than UnimplementedFocasClientFactory. UnimplementedFocasClientFactory stays as an opt-in. 41 new tests — 14 in FocasReadWriteTests (ordered unknown-ref handling, successful PMC/Parameter/Macro reads routing through correct FocasAreaKind, repeat-read reuses connection, FOCAS error mapping, exception paths, batched order across areas, non-writable rejection, successful write logging, status mapping, batch ordering, cancellation, shutdown disposes), 27 in FwlibNativeHelperTests (12 letter-mapping cases + 3 unknown rejections + 6 data-type mapping + 4 encode helpers + Bit-write NotSupported). Total FOCAS unit tests now 106/106 passing (+41 from PR 1's 65); full solution builds 0 errors; Modbus / AbCip / AbLegacy / TwinCAT / other drivers untouched. FOCAS driver is real-wire-capable from day one — deployment drops Fwlib32.dll beside the server + driver talks to live FS 0i/16i/18i/21i/30i/31i/32i controllers.
FOCAS PR 2 � IReadable + IWritable + real FwlibFocasClient P/Invoke
FOCAS PR 2 � IReadable + IWritable + real FwlibFocasClient P/Invoke
dohertj2
created branch focas-pr2-read-write-real-client in dohertj2/lmxopcua
2026-04-19 19:57:11 -04:00
a2c7fda5f5
FOCAS PR 2 — IReadable + IWritable + real FwlibFocasClient P/Invoke. Closes task #193 early now that strangesast/fwlib provides the licensed DLL references. Skips shipping with the Unimplemented stub as the default — FwlibFocasClientFactory is now the production default, UnimplementedFocasClientFactory stays as an opt-in for tests/deployments without FWLIB access. FwlibNative — narrow P/Invoke surface for the 7 calls the driver actually makes: cnc_allclibhndl3 (open Ethernet handle), cnc_freelibhndl (close), pmc_rdpmcrng + pmc_wrpmcrng (PMC range I/O), cnc_rdparam + cnc_wrparam (CNC parameters), cnc_rdmacro + cnc_wrmacro (macro variables), cnc_statinfo (probe). DllImport targets Fwlib32.dll; deployment places it next to the executable or on PATH. IODBPMC/IODBPSD/ODBM/ODBST marshaled with LayoutKind.Sequential + Pack=1 + fixed byte-array unions (avoids LayoutKind.Explicit complexity; managed-side BitConverter extracts typed values from the byte buffer). Internal helpers FocasPmcAddrType.FromLetter (G=0/F=1/Y=2/X=3/A=4/R=5/T=6/K=7/C=8/D=9/E=10 per Fanuc FOCAS/2 spec) + FocasPmcDataType.FromFocasDataType (Byte=0 / Word=1 / Long=2 / Float=4 / Double=5) exposed for testing without the DLL loaded. FwlibFocasClient is the concrete IFocasClient backed by P/Invoke. Construction is licence-safe — .NET P/Invoke is lazy so instantiating the class does NOT load Fwlib32.dll; DLL loads on first wire call (Connect/Read/Write/Probe). When missing, calls throw DllNotFoundException which the driver surfaces as BadCommunicationError via the normal exception path. Session-scoped handle from cnc_allclibhndl3; Dispose calls cnc_freelibhndl. Dispatch on FocasAreaKind — Pmc reads use pmc_rdpmcrng with the right ADR_* + data-type codes + parses the union via BinaryPrimitives LittleEndian, Parameter reads use cnc_rdparam + IODBPSD, Macro reads use cnc_rdmacro + compute scaled double as McrVal / 10^DecVal. Write paths mirror reads. PMC Bit writes throw NotSupportedException pointing at task #181 (read-modify-write gap — same as Modbus / AbCip / AbLegacy / TwinCAT). Macro writes accept int + pass decimal-point count 0 (decimal precision writes are a future enhancement). Probe calls cnc_statinfo with ODBST result. Driver wiring — FocasDriver now IDriver + IReadable + IWritable. Per-device connection caching via EnsureConnectedAsync + DeviceState.Client. ReadAsync/WriteAsync dispatch through the injected IFocasClient — ordered snapshots preserve per-tag status, OperationCanceledException rethrows, FormatException/InvalidCastException → BadTypeMismatch, OverflowException → BadOutOfRange, NotSupportedException → BadNotSupported, anything else → BadCommunicationError + Degraded health. Connect-failure disposes the half-open client. ShutdownAsync disposes every cached client. Default factory switched — constructor now defaults to FwlibFocasClientFactory (backed by real Fwlib32.dll) rather than UnimplementedFocasClientFactory. UnimplementedFocasClientFactory stays as an opt-in. 41 new tests — 14 in FocasReadWriteTests (ordered unknown-ref handling, successful PMC/Parameter/Macro reads routing through correct FocasAreaKind, repeat-read reuses connection, FOCAS error mapping, exception paths, batched order across areas, non-writable rejection, successful write logging, status mapping, batch ordering, cancellation, shutdown disposes), 27 in FwlibNativeHelperTests (12 letter-mapping cases + 3 unknown rejections + 6 data-type mapping + 4 encode helpers + Bit-write NotSupported). Total FOCAS unit tests now 106/106 passing (+41 from PR 1's 65); full solution builds 0 errors; Modbus / AbCip / AbLegacy / TwinCAT / other drivers untouched. FOCAS driver is real-wire-capable from day one — deployment drops Fwlib32.dll beside the server + driver talks to live FS 0i/16i/18i/21i/30i/31i/32i controllers.
285799a954
FOCAS PR 1 — Scaffolding + Core (FocasDriver skeleton + address parser + stub client). New Driver.FOCAS project for Fanuc CNC controllers (FS 0i/16i/18i/21i/30i/31i/32i/Series 35i/Power Mate i) talking via the Fanuc FOCAS/2 protocol. No NuGet reference to a FOCAS library — FWLIB (Fwlib32.dll) is Fanuc-proprietary + per-customer licensed + cannot be legally redistributed, so the driver is designed from the start to accept an IFocasClient supplied by the deployment side. Default IFocasClientFactory is UnimplementedFocasClientFactory which throws with a clear deployment-docs pointer at Create time so misconfigured servers fail fast rather than mysteriously hanging. Matches the pattern other drivers use for swappable wire layers (Modbus IModbusTransport, AbCip IAbCipTagFactory, TwinCAT ITwinCATClientFactory) — but uniquely, FOCAS ships without a production factory because of licensing. FocasHostAddress parses focas://{host}[:{port}] canonical form with default port 8193 (Fanuc-reserved FOCAS Ethernet port). Default-port stripping on ToString for roundtrip stability. Case-insensitive scheme. Rejects wrong scheme, empty body, invalid port, non-numeric port. FocasAddress handles the three addressing spaces a FOCAS driver touches — PMC (letter + byte + optional bit, X/Y for IO, F/G for PMC-CNC signals, R for internal relay, D for data table, C for counter, K for keep relay, A for message display, E for extended relay, T for timer, with .N bit syntax 0-7), CNC parameters (PARAM:n for a parameter number, PARAM:n/N for bit 0-31 of a parameter), macro variables (MACRO:n). Rejects unknown PMC letters, negative numbers, out-of-range bits (PMC 0-7, parameter 0-31), non-numeric fragments. FocasDataType — Bit / Byte / Int16 / Int32 / Float32 / Float64 / String covering the atomic types PMC reads + CNC parameters + macro variables return. ToDriverDataType widens to the Int32/Float32/Float64/Boolean/String surface. FocasStatusMapper covers the FWLIB EW_* return-code family documented in the FOCAS/1 + FOCAS/2 references — EW_OK=0, EW_FUNC=1 → BadNotSupported, EW_OVRFLOW=2/EW_NUMBER=3/EW_LENGTH=4 → BadOutOfRange, EW_PROT=5/EW_PASSWD=11 → BadNotWritable, EW_NOOPT=6/EW_VERSION=-9 → BadNotSupported, EW_ATTRIB=7 → BadTypeMismatch, EW_DATA=8 → BadNodeIdUnknown, EW_PARITY=9 → BadCommunicationError, EW_BUSY=-1 → BadDeviceFailure, EW_HANDLE=-8 → BadInternalError, EW_UNEXP=-10/EW_SOCKET=-16 → BadCommunicationError. IFocasClient + IFocasClientFactory abstraction — ConnectAsync, IsConnected, ReadAsync returning (value, status) tuple, WriteAsync returning status, ProbeAsync for IHostConnectivityProbe. Deployment supplies the real factory; driver assembly stays licence-clean. FocasDriverOptions + FocasDeviceOptions + FocasTagDefinition + FocasProbeOptions — one instance supports N CNCs, tags cross-key by HostAddress + use canonical FocasAddress strings. FocasDriver implements IDriver only (PRs 2-3 add read/write/discover/subscribe/probe/resolver). InitializeAsync parses each device HostAddress + fails fast on malformed strings → Faulted health. 65 new unit tests in FocasScaffoldingTests covering — 5 valid host forms + 8 invalid + default-port-strip ToString, 12 valid PMC addresses across all 11 canonical letters + 3 parameter forms with + without bit + 2 macro forms, 10 invalid address shapes, canonical roundtrip theory, data-type mapping theory, FWLIB EW_* status mapping theory (9 codes + unknown → generic), DriverType, multi-device Initialize + address parsing, malformed-address fault, shutdown, default factory throws NotSupportedException with deployment pointer + Fwlib32.dll mention. Total project count 31 src + 20 tests; full solution builds 0 errors. Other drivers untouched.