Joseph Doherty
0f88a953d7
First PR of the alarms-over-gateway epic (docs/plans/alarms-over-gateway.md in lmxopcua). Pure contract-surface change — no functional wiring yet. Worker-side subscription (A.2), gateway-side dispatch + ack handler (A.3), and ConditionRefresh (A.4) follow. mxaccess_gateway.proto: - Extend MxEventFamily with MX_EVENT_FAMILY_ON_ALARM_TRANSITION = 5. - Extend MxEvent.body oneof with OnAlarmTransitionEvent on_alarm_transition = 24. - Add OnAlarmTransitionEvent message carrying the full MxAccess alarm payload (full reference, source object, alarm-type-name, transition kind, raw severity, original raise timestamp, transition timestamp, operator user/comment, category, description, current/limit value). Mapping to OPC UA 0-1000 severity ladder happens server-side in lmxopcua's MxAccessSeverityMapper (B.1) — gateway preserves the native MxAccess scale. - Add AlarmTransitionKind enum (Raise / Acknowledge / Clear / Retrigger). - Add ActiveAlarmSnapshot + AlarmConditionState for the ConditionRefresh stream. - Add public RPCs AcknowledgeAlarm (unary) and QueryActiveAlarms (server-streaming) on MxAccessGateway service. - Add AcknowledgeAlarmRequest/Reply + QueryActiveAlarmsRequest. GatewayContractInfo.GatewayProtocolVersion bumps 2 -> 3. Fixture manifests (proto-inputs, behavior, parity, golden OpenSessionReply) and protoset descriptor regenerated. Tests: round-trip serialization for the new messages with all-fields-populated and empty-optional-fields cases; oneof last-write-wins guard between OnDataChange and OnAlarmTransition; descriptor service-method enumeration includes the two new RPCs. All 273 existing tests still pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>