Open Smart-Home APIs: How to Avoid Technology Lock-In

The field layer connects sensors and actuators. The scenario layer holds zone states, rules and safety constraints. The service layer provides APIs, logs, remote diagnostics and integration with applications or ERP.

Replacing a mobile application should not require replacing climate controllers. Updating an AI model should not alter interlock logic for water, gas or power loads.

KNX supports distributed building automation. Modbus and BACnet are common for climate and engineering equipment. Matter improves compatibility for some consumer devices. MQTT supports event exchange. Home Assistant can serve as an integration and scenario layer.

The choice is validated through documentation, diagnostics, failure behavior, service competence and the ability to replace an individual component.

Commands and events define schemas, units, timestamps, correlation IDs and data-quality indicators. Webhooks use signatures, retries and duplicate protection. Access is separated by role and property.

Critical commands pass server-side validation and allowed ranges. An external service cannot bypass local automation by writing directly to an actuator.

The contract defines configuration ownership, export methods, backups, account inventory and access revocation. Firmware versions, dependencies and licenses are documented.

The migration plan states which functions remain local, how history is transferred, where acceptance tests must be repeated and how two systems are prevented from issuing conflicting commands.

MOSCOS checks equipment models, versions, network topology, available data points, write behavior, vendor constraints, access security and connectivity-loss behavior.

The output is an integration matrix covering source, consumer, permitted commands, frequency, fallback, responsible component and acceptance-test method.