matter-python-client 0.4.4a0.dev20260226

Python Client for the OHF Matter Server

Python Client for the OHF Matter Server

A PyPI package (matter-python-client) providing Python bindings for the OHF Matter Server. This is a drop-in replacement for the client portion of python-matter-server, with custom cluster definitions updated to match the Matter.js server.

Origin

The client and common modules were copied from python-matter-server v8.1.2 and modified:

• Source: matter_server/client/ and matter_server/common/ from python-matter-server
• Modified: matter_server/common/custom_clusters.py — updated to match the JS server's cluster definitions
• Excluded: matter_server/server/ (the JS server replaces it), common/helpers/logger.py (depends on coloredlogs, a server-only dependency)

Custom Cluster Changes

Cluster	Change
EveCluster	+8 attributes (getConfig, setConfig, loggingMetadata, loggingData, lastEventTime, statusFault, childLock, rloc16), wattAccumulatedControlPoint type fixed
HeimanCluster	Attribute IDs shortened to match JS server
NeoCluster	Types changed from float32 to uint
Polling	Removed (JS server handles polling natively)

Package

• PyPI name: matter-python-client
• Python module: matter_server (same import path as python-matter-server)
• Python: >= 3.12
• Dependencies: aiohttp, orjson, home-assistant-chip-clusters

npm Scripts (from monorepo root)

# First-time setup: create venv and install with test dependencies
npm run python:install

# Run unit + mock server tests (fast, ~1s)
npm run python:test

# Run full integration tests against real Matter.js server + test device (~40s)
npm run python:test-integration

# Run all Python tests
npm run python:test-all

# Build the PyPI package (.tar.gz + .whl)
npm run python:build

Usage

The package provides the same matter_server.client API as python-matter-server:

import aiohttp
from matter_server.client import MatterClient

async with aiohttp.ClientSession() as session:
    client = MatterClient("ws://localhost:5580/ws", session)
    await client.connect()

    init_ready = asyncio.Event()
    listen_task = asyncio.create_task(client.start_listening(init_ready))
    await init_ready.wait()

    nodes = client.get_nodes()

To use this package instead of python-matter-server in the Home Assistant Matter integration, change manifest.json:

- "requirements": ["python-matter-server==8.1.2"],
+ "requirements": ["matter-python-client==1.0.0"],

Testing

The test suite has three layers:

• Import smoke tests (8 tests) — verify all HA integration imports resolve
• Mock server tests (4 tests) — Python client against JS MockMatterServer subprocess
• Integration tests (63 tests) — Python client against real Matter.js server + test device, mirroring the JS IntegrationTest.ts