HAP-python is a HomeKit Accessory Protocol implementation in Python 3. It lets you expose your own smart home devices as HomeKit accessories, so you can add them to the Home app on your Apple device.

Main features:

• Camera support — negotiate stream settings with iOS and start video/audio streams (see pyhap/camera.py).
• asyncio support — run various tasks or accessories in the event loop.
• Out of the box support for Apple-defined services — see them in the resources folder.
• Secure pairing — just scan a QR code, no manual codes to type in.
• Proven in production — HAP-python powers the HomeKit integration of the home automation framework Home Assistant.

Full API documentation is available on readthedocs.

As a prerequisite, you will need Avahi/Bonjour installed (due to the zeroconf package). On a Raspberry Pi, you can get it with:

$ sudo apt-get install libavahi-compat-libdnssd-dev

avahi-utils may also fit the bill. Then, you can install with e.g. pip:

$ pip install HAP-python[QRCode]

This will install HAP-python in your Python packages, so that you can import it as pyhap. The following optional features can be installed via pip extras:

• QRCode — print a pairing QR code in the terminal (base36, pyqrcode).
• bench — dependencies for running the benchmarks (psutil, py-spy).

Implementing an accessory is as simple as subclassing Accessory and handing it over to an AccessoryDriver, which advertises it on the local network, sets up a HAP server and runs it:

import signal

from pyhap.accessory import Accessory
from pyhap.accessory_driver import AccessoryDriver
from pyhap.const import CATEGORY_LIGHTBULB


class LightBulb(Accessory):
    """A simple mock light bulb that reacts to being toggled."""

    category = CATEGORY_LIGHTBULB  # This is for the icon in the iOS Home app.

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        service = self.add_preload_service('Lightbulb')
        # The callback fires every time the value is set from the Home app.
        self.char_on = service.configure_char('On', setter_callback=self.bulb_toggled)

    def bulb_toggled(self, value):
        print(f'The light is now {"on" if value else "off"}')
        # Here you could e.g. fire some GPIO code to switch a real light.


# Start the accessory on the network, so it can be added in the Home app
# (be sure to be on the same network). Stop it with Ctrl+C.
driver = AccessoryDriver(port=51826)
driver.add_accessory(accessory=LightBulb(driver, 'My LightBulb'))

# We want SIGTERM (terminate) to be handled by the driver itself,
# so that it can gracefully stop the accessory, server and advertising.
signal.signal(signal.SIGTERM, driver.signal_handler)

driver.start()

Run the script, add the accessory in the Home app, and toggling the light in the app will print its new state. To do work in the background, you can also override the run and stop methods — see main.py for an example of that.

There are more example accessories — as well as integrations with real products such as the DHT11 temperature sensor, NeoPixel light strips and displays — in the accessories folder. See how to configure your camera in accessories/camera_main.py.

The Camera accessory implements the HomeKit Protocol for negotiating stream settings, such as the picture width and height or the number of audio channels. Because starting a video and/or audio stream is very platform specific, you need to figure out what video and audio settings your camera supports and describe them in the options parameter passed to the Camera constructor. HAP-python can then either run a custom stream command for you, or you can take full control by implementing the start_stream, stop_stream and reconfigure_stream methods. See the documentation of the Camera class and its methods in pyhap/camera.py for details, and accessories/camera_main.py for a working example.

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