openccu-loom-client 2026.6.20

Async Python REST + WebSocket client for the openccu-loom daemon

openccu-loom-client

Status: WIP / Alpha — transport, event bus, domain store, the full daemon REST surface (HA-relevant + admin/ops), and the aiohomematic compat namespace are in place (see "Status of the wire contract" below).

Async Python REST + WebSocket client for the openccu-loom daemon.

Designed as the drop-in replacement for aiohomematic in the homematicip_local Home-Assistant custom component, once the daemon has fully replaced direct XML-RPC/JSON-RPC contact with the CCU.

Architecture

Wire types come from the sister package openccu-loom-types (Pydantic models + enum catalogue, generated from the daemon's assets/openapi.yaml and assets/schemas/enums.json). This package adds:

• transport/http.py — async REST client (aiohttp), RFC 9457 problem+json parsing, retry/backoff.
• transport/ws.py — WebSocket loop with subscribe/unsubscribe, heartbeat, resume-after-reconnect via seq/since cursor per ADR-0022.
• client.py — LoomClient facade: snapshot bootstrap, event bus, in-memory store, and the operation modules (devices, datapoints, custom_data_points, hub, system, schedules, links).
• compat/aiohomematic/ — namespace shim so existing homematicip_local imports keep working during the cutover. This includes a LoomCentralAdapter that presents aiohomematic's CentralUnit + coordinator surface, and a categorised data-point model (generic Dp*, hub SysvarDp*/ProgramDp*, custom CustomDp* for light/cover/climate/lock/siren/valve/switch) with unique_id/category/registered bookkeeping. A refresh bridge fans the daemon's value/sysvar/custom events into the single DataPointStateChangedEvent (keyed by unique_id) HA entities subscribe to.

Status of the wire contract

The daemon's external-client contract is tracked in docs/external-clients/asks.md in the daemon repo. As of openccu-loom-types==0.1.2, all push-event payloads needed by Home Assistant (DataPointValueChanged, CustomDataPointStateChanged, CentralStateChanged, SystemStatusChanged, SysvarChanged, ProgramExecuted, InstallModeChanged, DeviceCreated, DeviceRemoved) ship typed and are bound in the event registry.

The full daemon REST surface is wrapped — typed end-to-end against openccu-loom-types:

• HA-relevant: devices/channels/data-points, paramsets, batch reads, custom data points, programs and sysvars (incl. create / metadata-patch / lifecycle), alarm/service messages (incl. ack), install-mode, interfaces, rooms/functions, firmware updates, calculated data points, climate schedules / week-profiles, and direct/central links.
• Admin / ops: auth + API-token provisioning (client.auth), users (client.users), centrals (client.centrals), config management (client.config_admin), diagnostics / log-levels / capture / RPC-recording / metrics / values-cache / MQTT-reload / audit (client.diagnostics), backups (client.backup), edit-lock sessions (client.sessions), the Matter bridge (client.matter), and parameter visibility (client.visibility).

The schedule, link and calculated-data-point schemas were added to the daemon's openapi.yaml (components.schemas) and regenerated into openccu-loom-types 0.1.3, so they are typed rather than free-form dicts.

Two gaps remain and are daemon-side, not closeable from the client alone:

• OptimisticRollback — not yet broadcast by the daemon; synthesized client-side from REST set_value failures in the meantime.
• Device trigger / keypress events — central-links forwarding can be enabled via REST, but the daemon does not yet emit the corresponding click broadcast (reserved topic namespace). The DeviceTriggerEvent compat class is ready to bind once it ships.

Development

python3.11 -m venv venv
source venv/bin/activate
pip install -e '.[dev]'
pytest

License

MIT. See LICENSE.