osbornehoffman

Python 3 package to interface with Osborne-Hoffman (OH+CID, OH+SIA or OH+XSIA) compatible panels:

• CSX75 Panel Range (CS7050(N) TCP/IP gateway)
• CSX75 Panel Range (CS9104/9204 Video Verification Module)
• CSX75 Panel Range (CS7002(N) GSM/GPRS module)
• ATS MASTER Panel range (ATS2xxx, ATS3xxx, ATS4xxx with ATS1806 or ATS1809)
• ATS Advanced (with TDA74xx GRPS/IP modules or ATS7310 GSM/GPRS module)
• ATS Advanced IP (ATSx000A-IP, ATSx500A-IP)
• NetworX Panel Range (NX-590(N)E TCP/IP gateway)
• NetworX Panel Range (NX-9104/9204 Video Verification Module)
• NetworX Panel Range (NX-7002(N) GSM/GPRS module)
• Simon Panel Range (60-938)

Protocol Support

• V1-V3: 3DES/ECB encryption with XOR-scrambled key handshake
• V4: AES-256/CBC encryption with Diffie-Hellman key exchange and IV mixing

The Osborne-Hoffman protocol is a TCP overlay protocol where the server sends a scrambled 192-bit 3DES key to the panel. V4 extends this with a Diffie-Hellman negotiation for AES-256 key derivation.

Installation

pip install osbornehoffman

Requires Python >= 3.10 and pycryptodome.

Usage

Using OHClient (recommended)

import asyncio
from osbornehoffman import OHClient, OHAccount, OHEvent

async def main():
    async def on_event(event: OHEvent) -> None:
        print(f"Event: code={event.code}, account={event.effective_account}")

    accounts = [OHAccount("001234")]
    async with OHClient("0.0.0.0", 8996, accounts, on_event) as client:
        await asyncio.Event().wait()  # run forever

asyncio.run(main())

Using OHServer directly

import asyncio
from osbornehoffman import OHServer, OHAccount

async def main():
    async def process_event_cb(event: dict) -> bool:
        print("Processing event")
        return True

    accounts = {"001234": OHAccount("001234")}
    server = OHServer("0.0.0.0", 8996, accounts, process_event_cb)
    await server.start_server()
    async with server.server:
        await server.server.serve_forever()

asyncio.run(main())

Key Classes

• OHClient - High-level async client with lifecycle management (start/stop, context manager)
• OHServer - Low-level TCP server handling protocol framing and encryption
• OHAccount - Account configuration (account_id, panel_id, forward_heartbeat)
• OHEvent - Parsed event dataclass with code, ri, effective_account properties
• OHKeyStore - JSON-based persistence for V4 AES keys
• MessageType - Enum for event types (SIA, CID, HB_V1, HB_V2, DHR, V4)