PowerView Connect

An async Python client for Hunter Douglas / Luxaflex PowerView Gen 3 gateways, over their local HTTP API and shade event stream.

It is built on what a real Gen 3 gateway was measured to do (see the protocol notes):

• A move sends only the rails it names. The gateway leaves a rail that is not sent where it is, so a command to the top rail of a top-down/bottom-up shade can never undo a command to the bottom rail sent a moment before.
• The event stream says when a shade starts and stops moving, whatever moved it: this client, the PowerView app, a scene, a voice assistant. Nothing needs polling while nothing moves.
• A moving shade reports its live position, so a shade can be followed by polling it, and only it, while it moves. ShadeTracker decides when a move has ended.

aiohttp is its only dependency. It is unofficial: PowerView is a trademark of Hunter Douglas, which has nothing to do with this library.

Installation

pip install powerview-connect

Usage

import asyncio
import aiohttp
from powerview_connect import EventKind, PowerViewClient, Rail

async def main():
    async with aiohttp.ClientSession() as session:
        client = PowerViewClient(session, "<gateway-ip>")

        home = await client.get_home()                 # gateways, shades, scenes
        for shade in home.shades.values():
            print(shade.id, shade.name, shade.capability, dict(shade.positions))

        await client.set_positions([154], secondary=0.5)   # the top rail only
        await client.set_positions([154], primary=0.2)     # the bottom rail only

        async with client.shade_events(idle_timeout=360) as events:
            async for event in events:
                if event.kind == EventKind.MOTION_STOPPED:
                    print(event.shade_id, "stopped at", dict(event.current))

asyncio.run(main())

Use the address of the primary gateway: it lists the whole home, auxiliary gateways and their shades included. home.gateway_at(host) says which gateway an address is.

Positions

Every rail runs from 0.0, fully closed, to 1.0, fully open:

A top-down/bottom-up shade's own firmware stops a rail where it meets the other one, so a move that would cross them is safe to send.

Commands

A command the gateway reports an error for raises CommandError. A client made with read_only=True refuses every command with ReadOnlyError before anything is sent.

Events

shade_events(idle_timeout) opens the event stream; iterating it yields a ShadeEvent for each event, with kind, shade_id, current and, for a motion start, target and eta:

The stream ends when the gateway closes it, and raises CannotConnectError when it breaks or sends nothing for idle_timeout seconds; the gateway sends nothing while nothing moves, so reopen it. eta is the gateway's estimate of the move's time, which real moves took about twice as long as.

Following a move

ShadeTracker follows one shade. It does no I/O and reads no clock: give it the events, the positions polled while the shade moves, and the commands sent, each with the time.

tracker = ShadeTracker(shade.positions)
tracker.motion_started(event, now=time.monotonic())        # or tracker.command(now, {Rail.PRIMARY: 0.2})
while tracker.poll((await client.get_shade(shade.id)).positions, now=time.monotonic()):
    print(tracker.current[Rail.PRIMARY], tracker.direction(Rail.PRIMARY))
    await asyncio.sleep(1)

A move ends with whichever comes first: motion-stopped, the target reached and still for 1.5 s, no change for 6 s after the shade moved, no move at all 25 s after the command, or a timeout.

Testing your code

powerview_connect.testing.SimulatedGateway is a gateway on 127.0.0.1 that answers as a real one was measured to, for your own tests:

from powerview_connect import Capabilities, PowerViewClient, Rail
from powerview_connect.testing import SimulatedGateway

async with SimulatedGateway() as gateway:
    gateway.add_room(1, "Living Room")
    gateway.add_shade(10, "Window", room_id=1, capabilities=Capabilities.TOP_DOWN_BOTTOM_UP)
    client = PowerViewClient(session, gateway.host)
    await client.set_positions([10], primary=0.5)    # motion-started on every stream
    gateway.move(10, {Rail.PRIMARY: 0.2})            # part of the way, as a poll sees it
    gateway.finish(10)                               # at the target; motion-stopped
    print(gateway.requests[-1].body)                 # {'positions': {'primary': 0.5}}

It also drops streams (drop_streams), goes offline and comes back (close, start), reports a shade offline (set_online) and reports errors for commands (command_errors).

Links

• Releases
• Issues
• Home Assistant integration