BACpypes3 - Python library for BACnet applications

BACpypes provides a BACnet application layer and network layer written in Python for daemons, scripting, and graphical interfaces. This version is the next generation for Python3.8+, completely overhauled from the Python2.5+ version using async/await methods and asyncio for communications.

MCP (Model Context Protocol) integration

The bacpypes3.mcp module exposes the BACpypes3 CLI commands (whois, read, write, rpm, wirtn, BBMD ops, …) as MCP tools with natural names (who_is, read_property, write_property, read_property_multiple, who_is_router_to_network, …). It has three personalities:

1. Importable library. Each tool is a plain async function returning JSON-serializable Python values. Inject an Application and call the tools directly.
2. Stand-alone MCP server. python -m bacpypes3.mcp <BACpypes flags> builds an Application via SimpleArgumentParser and serves the tools over stdio using FastMCP.
3. Embedded server. A long-running BACnet server can inject its own Application and start mcp.serve_http(...) as a concurrent asyncio task, so an LLM agent can drive it over HTTP without fighting the host application's stdout. See samples/mini-device-mcp.py for the reference pattern.

The mcp and pydantic packages are declared as an optional extra and are only imported when a server is actually built; the tool functions are usable without them:

pip install -e ".[mcp]"      # to run the server