Ryan Malloy
14d16a5a4c
Three pieces close out the editor's main gaps:
F1 — backend includes raw fields in programs/get response:
_program_to_fields() serialises a Program record into the same
field dict the editor form consumes. Round-trips through
programs/write are now lossless (fetch → edit → write produces
byte-identical wire output if no fields changed). The old TODO
in _fetchProgramFields was about exactly this — the frontend
was seeding from sensible defaults rather than real values
because the wire didn't carry raw fields. Now it does.
Verified by a new round-trip test: read slot 42, write the same
fields back, assert the encoded wire bytes are identical.
F2 — EVENT program editor:
EVENT records pack a 16-bit event_id into (month<<8 | day).
Editing requires decoding that ID into one of four categories:
* "button" — USER_MACRO_BUTTON, low byte = button index
* "zone" — ZONE_STATE_CHANGE, packed zone + state-change kind
* "unit" — UNIT_STATE_CHANGE, packed unit + on/off
* "fixed" — hand-rolled IDs (phone events, AC power) from
EVENT_AC_POWER_OFF / EVENT_PHONE_RINGING / etc.
TS helpers decodeEventId / encodeEventId / packEventIdIntoFields
mirror the Python helpers in program_engine.py.
UI: category dropdown switches the sub-fields (button picker,
zone+state pair, unit+on/off, fixed-event picker). Each change
re-encodes back to month/day. Existing programs with unrecognised
IDs fall into a "raw" category that shows the literal hex —
user can switch category to redefine.
F3 — YEARLY program editor:
YEARLY records have month + day + hour + minute, no days-bitmask.
The editor now switches on prog_type to pick the right trigger
section: month dropdown (named months), day number input,
hour/minute number inputs.
Editor render path refactored: _renderTriggerSection(draft)
dispatches to _renderTimedTrigger / _renderEventTrigger /
_renderYearlyTrigger by prog_type. _renderActionSection is
shared across all three (command picker + object picker + level%).
Action editing works identically regardless of trigger.
Edit button visibility extended from "TIMED only" to any
program_type in EDITABLE_PROG_TYPES (TIMED / EVENT / YEARLY).
REMARK and clausal chains remain read-only.
Full suite: 648 passed, 1 skipped (up from 647, F1 round-trip test).
Frontend bundle: 56 KB minified (up from 47 KB with EVENT + YEARLY
forms and event-id helpers).
omni-pca
Async Python client for HAI/Leviton Omni-Link II home automation panels — Omni Pro II, Omni IIe, Omni LTe, Lumina.
Includes a Home Assistant custom component (custom_components/omni_pca/).
Project home: https://github.com/rsp2k/omni-pca Documentation: https://hai-omni-pro-ii.warehack.ing/
Status
Alpha. Built from a full reverse-engineering of HAI's PC Access 3.17 (the Windows installer/programmer app). The protocol layer captures two non-public quirks that public Omni-Link clients miss:
- Session key is not the ControllerKey. Last 5 bytes are XORed with a controller-supplied SessionID nonce.
- Per-block XOR pre-whitening before AES. First two bytes of every 16-byte block are XORed with the packet's sequence number.
The full byte-level protocol spec lives at https://hai-omni-pro-ii.warehack.ing/reference/protocol/.
Install
pip install omni-pca
# Or with uv
uv add omni-pca
For Home Assistant users, install the integration through HACS — see the HA install how-to.
Quick start (library)
import asyncio
from omni_pca import OmniClient
async def main():
async with OmniClient(
host="192.168.1.9",
port=4369,
controller_key=bytes.fromhex("6ba7b4e9b4656de3cd7edd4c650cdb09"),
) as panel:
info = await panel.get_system_information()
print(info.model_name, info.firmware_version)
asyncio.run(main())
For the panel walkthrough — connect, list zones, react to push events — see the tutorial.
Two wire dialects — TCP/v2 vs UDP/v1
The Omni network module is configurable at the panel keypad to listen on TCP, UDP, or both. Each transport speaks a different wire dialect — OmniClient above handles the TCP path (OmniLink2, the modern wire format used by PC Access ≥ 3); panels configured UDP-only fall back to the legacy v1 protocol with typed RequestZoneStatus / RequestUnitStatus opcodes, no RequestProperties, and streaming name downloads. For those, use OmniClientV1 from the omni_pca.v1 subpackage:
from omni_pca.v1 import OmniClientV1
async with OmniClientV1(
host="192.168.1.9",
controller_key=bytes.fromhex("..."),
) as panel:
info = await panel.get_system_information() # same dataclass as v2
names = await panel.list_all_names() # streaming UploadNames
zones = await panel.get_zone_status(1, 16) # typed status by range
await panel.execute_security_command(area=1, mode=SecurityMode.AWAY, code=1234)
The HA integration picks the right client automatically based on the Transport dropdown in the config flow (TCP vs UDP). See zone & unit numbering for why v1 panels need the long-form RequestUnitStatus for unit indices > 255.
Quick start (Home Assistant)
# Manual install — works on every HA flavour
cd /path/to/your/homeassistant/config/
mkdir -p custom_components
cd custom_components
git clone https://github.com/rsp2k/omni-pca tmp-omni
cp -r tmp-omni/custom_components/omni_pca .
rm -rf tmp-omni
Restart HA, then add the integration via Settings → Devices & Services. You'll need:
- Panel IP / hostname
- TCP port (default 4369)
- ControllerKey as 32 hex chars
Get the ControllerKey from your .pca file using the bundled CLI:
omni-pca decode-pca '/path/to/Your.pca' --field controller_key
The integration creates one HA device per panel plus typed entities for every named object on the controller: alarm_control_panel for areas, light for units, binary_sensor + switch for zones (state + bypass), climate for thermostats, sensor for analog zones and panel telemetry, button for panel macros, and event for the typed push-notification stream. See custom_components/omni_pca/README.md for the full entity + service catalog, or the HA install how-to for the step-by-step.
Without a panel — mock controller
The library ships a stateful MockPanel that emulates the controller side of the protocol over real TCP. Useful for offline development, integration tests, and demos:
from omni_pca.mock_panel import MockPanel
async with MockPanel(controller_key=...).serve(port=14369):
# Connect a real OmniClient to localhost:14369 — full handshake + AES
...
The local dev stack (dev/docker-compose.yml) packages a real Home Assistant container and the mock panel side-by-side so you can click through the integration without touching real hardware. See the dev-stack tutorial.
Tests
uv sync --group ha
uv run pytest -q
351 tests across the protocol primitives, the mock panel, the OmniClient ↔ MockPanel end-to-end roundtrip, and an in-process Home Assistant harness driving the integration via the real config flow + service calls.
Versioning
Date-based (CalVer): YYYY.M.D. Bumped on backwards-incompatible changes. See CHANGELOG.md.
License
MIT. See LICENSE.
Acknowledgments
This client is independent and not affiliated with Leviton or HAI. Protocol details derived from clean-room analysis of the publicly-distributed PC Access installer. The reverse-engineering arc is documented at https://hai-omni-pro-ii.warehack.ing/journey/.