python-zeroconf

Documentation.

This project is a fork of pyzeroconf, originally by Paul Scott-Murphy (https://github.com/paulsm/pyzeroconf), modified by William McBrine (https://github.com/wmcbrine/pyzeroconf).

Compatible with:

• Bonjour
• Avahi

Compared to some other Zeroconf/Bonjour/Avahi Python packages, python-zeroconf:

• isn't tied to Bonjour or Avahi
• doesn't use D-Bus
• doesn't force you to use particular event loop or Twisted (asyncio is used under the hood but not required)
• is pip-installable
• has PyPI distribution
• has an optional cython extension for performance (pure python is supported as well)

Python compatibility

• CPython 3.10+
• PyPy 3.10+

Versioning

This project uses semantic versioning.

Status

This project is actively maintained.

Traffic Reduction

Before version 0.32, most traffic reduction techniques described in https://datatracker.ietf.org/doc/html/rfc6762#section-7 where not implemented which could lead to excessive network traffic. It is highly recommended that version 0.32 or later is used if this is a concern.

IPv6 support

IPv6 support is relatively new and currently limited, specifically:

• InterfaceChoice.All is an alias for InterfaceChoice.Default on non-POSIX systems.
• Dual-stack IPv6 sockets are used, which may not be supported everywhere (some BSD variants do not have them).
• Listening on localhost (::1) does not work. Help with understanding why is appreciated.

How to get python-zeroconf?

• PyPI page https://pypi.org/project/zeroconf/
• GitHub project https://github.com/python-zeroconf/python-zeroconf

The easiest way to install python-zeroconf is using pip:

pip install zeroconf

How do I use it?

Here's how to discover services:

from zeroconf import ServiceBrowser, ServiceListener, Zeroconf


class EventLogger(ServiceListener):
    def add_service(self, zc: Zeroconf, type_: str, name: str) -> None:
        info = zc.get_service_info(type_, name)
        print(f"discovered {name}: {info}")

    def remove_service(self, zc: Zeroconf, type_: str, name: str) -> None:
        print(f"lost {name}")

    def update_service(self, zc: Zeroconf, type_: str, name: str) -> None:
        print(f"refreshed {name}")


with Zeroconf() as zc:
    ServiceBrowser(zc, "_http._tcp.local.", EventLogger())
    input("browsing, press enter to stop\n")

Note

Discovery and service registration use all available network interfaces by default. If you want to customize that you need to specify interfaces argument when constructing Zeroconf object (see the code for details).

To see which service types are present on the network, try:

from zeroconf import ZeroconfServiceTypes
print('\n'.join(ZeroconfServiceTypes.find()))

See examples directory for more.

Changelog

Changelog

License

GNU Lesser General Public License v2.1 or later (LGPL-2.1-or-later).

The full text of LGPL 2.1 is included in the COPYING file. You may, at your option, use this library under the terms of any later version of the LGPL published by the Free Software Foundation. The canonical SPDX identifier for this project is LGPL-2.1-or-later, as declared in pyproject.toml.