pysillaprism

Transport-agnostic Python client library for the Silla Prism EV wallbox, speaking its native MQTT protocol (topic manual rel. 4.0).

The library does not own an MQTT connection. It parses the Prism topics into typed state and builds the command topics; you wire it to whatever MQTT client you already have — for example Home Assistant's mqtt integration. This keeps it free of transport dependencies and trivially unit-testable.

Install

pip install pysillaprism

Usage

from pysillaprism import PrismDevice, PortMode

# `publish` may be sync or async (e.g. hass mqtt.async_publish).
async def publish(topic: str, payload: str) -> None:
    ...

device = PrismDevice("prism", publish=publish)

# Wire callbacks (all optional).
device.on_status_update = lambda upd: print("changed", upd.field)
device.on_event = lambda ev: print("touch/knock", ev.values)
device.on_command_result = lambda res: print(res.command, res.result)
device.on_hello = lambda info: print("serial", info.serial)

# Subscribe your MQTT client to `device.subscription_topic` ("prism/#")
# and feed every message in:
device.handle_message("prism/1/state", "3")

print(device.status.port(1).state)        # PortState.CHARGING
print(device.status.energy.power_grid)    # signed watts

# Send commands:
await device.set_mode(PortMode.NORMAL)
await device.set_current_limit(9.6)        # amps, for load balancing
await device.set_current_user(16)          # amps, mirrors the +/- buttons
await device.authorize()

Notes on the protocol

• Prism publishes a topic only when its value changes, so status fields stay None until first reported. Status topics are retained on the broker, so a fresh subscriber receives the current snapshot immediately.
• The hello announcement (which carries the serial and firmware version) is sent only when Prism (re)connects and is not retained. Treat device info as opportunistic: it populates on the next Prism reboot, and the device works without it. Identify a device by its base topic, not its serial.
• power_solar / power_house are only meaningful with a Powerwall/meter configured; otherwise Prism publishes 0.

License

MIT © Ermanno Baschiera. Not affiliated with Silla S.r.l.