v1.0.0

Changed: Bump dependencies to stable releases (go-mms v1.0.0, go-cotp v1.0.1).

Added: DialOptions.IEDName — when set, the client prepends the IED identifier to every MMS domain name it sends and strips it from domain names returned by the server. Callers can always use bare LD instance names regardless of whether the target is a stand-alone Go server (no prefix) or a full IEC 61850 server with a vendor IED name.

Added: SBO normal (select-before-operate, ctlModel=2) — Client.Select reads SBO[CO] and grants/denies ownership per connection; Server.RegisterControl with CtlModelSBONormal installs a read-interceptor that enforces single-owner semantics. executeOperate checks the owning connection identity for SBO normal and the originator identity for SBO enhanced, so both paths share a single control-execution function.

Added: SBO enhanced (select-before-operate with enhanced security, ctlModel=4) — Client.SelectWithValue sends an SBOw[CO] write containing a full Oper structure; Server.RegisterControl with CtlModelSBOEnhanced validates that the ctlNum in the subsequent Operate matches the one used at select time. Cancel clears the select reservation for both SBO models.

Added: Client.Cancel sends an MMS write to Cancel[CO], releasing any SBO reservation held by the caller.

Fixed: OperateParams / CancelParams Oper structure encoding — operTm is now omitted from the encoded structure when not set, instead of sending a zero-time seventh element. Several IEC 61850 servers (including libiec61850 and iec61850bean) define OperSPC_Type without operTm and reject a seven-element structure with TypeInconsistent.

Fixed: Server.RegisterControl now correctly handles the CtlModelSBOEnhanced (ctlModel=4) path: executeOperate validates ctlNum consistency between SelectWithValue and Operate, and executeCancel clears both selectOwner and selectCtlNum.

Added: General interrogation — Client.TriggerGI sends an RptEna+GI write sequence; the report engine emits a GI report carrying all dataset members with ReasonGeneralInterrogation set in the inclusion bits.

Fixed: Report engine multi-member dchg — writes to multiple dataset members in a single MMS Write now correctly produce one report containing all changed members rather than emitting separate per-member reports or silently dropping later changes.

Added: Server SetVariableRead(domain, itemID, fn) — overrides the MMS read function for an already-registered variable at runtime. Used internally by RegisterControl for SBO normal; also available to applications that need custom read-time behaviour.

Changed: internal/servermodel.Register now includes RP/BR functional-constraint groups in the LN TypeSpec so that external tools (e.g. iec61850bean) can discover URCBs via GetVariableAccessAttributes.

Fixed: buildRCBFields stores DatSet as a fully-qualified domain/LNName$dsName reference so that iec61850bean's processReport can resolve the dataset from its ServerModel.

Fixed: SCL ctlModel DAI values are now emitted as enum name strings (direct-with-normal-security, sbo-with-normal-security, etc.) rather than ordinals, for compatibility with iec61850bean's SCL parser.

Changed: Examples directory renamed from _examples/ to examples/.

Added: interop/ test suite — consumed via -tags=interop; exercises go-iec61850 against live libiec61850 and iec61850bean adapters from mms-interop. Covers: basic operations, URCB reporting (dchg, GI, multi-member), dataset depth, negative/error cases, direct control, SBO normal, and SBO enhanced (SBOw). See INTEROP.md for the full compatibility matrix.

Added: .github/workflows/interop.yml — CI workflow that runs the full interop suite against pinned mms-interop adapter images.