---
id: pypck
version: "0.9.14"
license: MIT
license_treatment: permissive
maintenance: active
---

# pypck — LCN-PCK library

License: permissive · Maintenance: active · Downloads: 78.3K/mo

## What it is and what it does

pypck is a Python async library that implements the LCN-PCK protocol to communicate with LCN (local control network) systems—a vendor-specific home automation platform. It abstracts the low-level protocol details into a connection manager and device objects, allowing you to control LCN modules (switches, dimmers, sensors) over a network connection. The library is actively maintained and used by Home Assistant's LCN integration.

To use pypck, you need an LCN-PCHK coupling software license and a hardware coupler device. The library provides async/await patterns for non-blocking control operations, making it suitable for integration into event-driven home automation systems. It has no external runtime dependencies beyond Python itself, keeping deployment simple.

Use it for:

- Integrate LCN home automation systems into Home Assistant or other Python-based home automation platforms
- Build custom control applications to remotely switch and dim LCN module outputs over the network
- Monitor and control LCN sensors and actuators from a Python application without blocking on I/O
- Automate lighting, heating, or other LCN-controlled devices via async event handlers

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

pypck is an asynchronous Python library for connecting to LCN (local control network) systems using the LCN-PCK protocol, enabling remote control of LCN modules.

Yes, if you own or manage an LCN system and need Python-based control. The library is actively maintained, has no external dependencies, and is proven in production use via Home Assistant. Requires Python 3.13+, an LCN-PCHK license, and a hardware coupler—verify those prerequisites before installing.

## Install

pip install pypck
uv add pypck
poetry add pypck

## Installing pypck

Before you install: Low install friction; pure Python wheel with no runtime dependencies. Active maintenance with recent release (44 days ago) and ongoing repository activity.

License in practice: MIT license permits unrestricted use, modification, and distribution with minimal restrictions—suitable for both commercial and open-source projects.

Quickstart:

pip install pypck

import asyncio
from pypck.connection import PchkConnectionManager
from pypck.lcn_addr import LcnAddr

async def main():
    async with PchkConnectionManager("192.168.2.41", 4114, username="lcn", password="lcn") as pck_client:
        module = pck_client.get_device_connection(LcnAddr(0, 10, False))
        await module.dim_output(0, 100, 0)

asyncio.run(main())

Requires Python 3.13+; also requires an LCN-PCHK coupling software license and hardware coupler to connect to an actual LCN system.

Verify before relying:

- Whether the LCN-PCHK coupling software license and hardware coupler are freely available or require separate purchase
- Performance characteristics and scalability limits for controlling large numbers of LCN modules
- Whether the library supports all LCN-PCK protocol versions or specific versions only

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 78.3K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

lcn home automation library, lcn-pck protocol python, local control network python, lcn module control, home assistant lcn integration, async lcn client, lcn device connection, home-automation, lcn-protocol, async-io

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