Jannis
3fc25c083b
The BMS only allows one simultaneous BLE connection. Keeping a persistent connection blocked the mobile app from connecting at all. Changes: - BmsBluetoothHandler: replace connect()/disconnect()/request() public API with a single poll() method that owns the full connect→read→disconnect lifecycle. Connection is held only for the duration of one data fetch. - Coordinator: gutted connection-state management — _async_update_data now just calls handler.poll() and processes results. No reconnect loop needed. - Poll interval defaults: 15s default, 10s min, 300s max. The BLE connect overhead (~2s) makes sub-10s intervals impractical. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
118 lines
4.3 KiB
Python
118 lines
4.3 KiB
Python
"""DataUpdateCoordinator for the Xiaoxiang Smart BMS."""
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from __future__ import annotations
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import logging
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from datetime import timedelta
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from homeassistant.components.bluetooth import async_ble_device_from_address
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from homeassistant.core import HomeAssistant
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from homeassistant.helpers.device_registry import DeviceInfo
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from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
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from .bluetooth_handler import BmsBluetoothHandler
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from .const import CMD_CELL, CMD_GENERAL, CMD_VERSION, DOMAIN
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_LOGGER = logging.getLogger(__name__)
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class BmsCoordinator(DataUpdateCoordinator[dict]):
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"""Polls the BMS over BLE and distributes data to all sensor entities.
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Uses a connect → read → disconnect pattern on every poll so the BMS's
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single BLE connection slot is free between updates (mobile app access).
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"""
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def __init__(
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self,
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hass: HomeAssistant,
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address: str,
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poll_interval: int,
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) -> None:
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super().__init__(
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hass,
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_LOGGER,
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name=DOMAIN,
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update_interval=timedelta(seconds=poll_interval),
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)
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self.address = address
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self._handler = BmsBluetoothHandler(address)
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self.hw_version: str | None = None
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# ------------------------------------------------------------------
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# Device info — shared by sensor, binary_sensor, number platforms
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# ------------------------------------------------------------------
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@property
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def device_info(self) -> DeviceInfo:
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return DeviceInfo(
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identifiers={(DOMAIN, self.address)},
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name="Xiaoxiang Smart BMS",
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manufacturer="Xiaoxiang",
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model=self.hw_version or "Smart BMS",
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)
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# ------------------------------------------------------------------
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# Lifecycle
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# ------------------------------------------------------------------
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async def async_setup(self) -> None:
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"""No-op — no persistent connection to establish."""
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async def async_teardown(self) -> None:
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"""No-op — each poll disconnects itself."""
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# ------------------------------------------------------------------
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# Poll
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# ------------------------------------------------------------------
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async def _async_update_data(self) -> dict:
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"""Connect to the BMS, fetch all data, disconnect."""
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device = async_ble_device_from_address(self.hass, self.address, connectable=True)
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if device is None:
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raise UpdateFailed(
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f"BMS ({self.address}) not reachable — check Bluetooth adapter / proxy"
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)
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# Fetch hardware version once; skip on subsequent polls
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commands = [CMD_GENERAL, CMD_CELL]
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if self.hw_version is None:
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commands.append(CMD_VERSION)
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try:
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responses = await self._handler.poll(device, commands)
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except Exception as exc:
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raise UpdateFailed(f"BMS poll failed: {exc}") from exc
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general_frame, cell_frame = responses[0], responses[1]
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if general_frame is None:
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raise UpdateFailed("No response to general info request (0x03)")
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if cell_frame is None:
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raise UpdateFailed("No response to cell info request (0x04)")
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if self.hw_version is None and len(responses) > 2 and responses[2]:
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self.hw_version = BmsBluetoothHandler.parse_version(responses[2])
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_LOGGER.debug("BMS hardware version: %s", self.hw_version)
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data = BmsBluetoothHandler.parse_general_info(general_frame)
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data.update(BmsBluetoothHandler.parse_cell_info(cell_frame))
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# Derived fields
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data["power"] = round(data["voltage"] * data["current"], 2)
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data["energy_stored"] = round(data["voltage"] * data["residual_capacity"] / 1000, 3)
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if data["cell_voltages"]:
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v_max = max(data["cell_voltages"])
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v_min = min(data["cell_voltages"])
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data["cell_delta"] = round((v_max - v_min) * 1000, 1)
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else:
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data["cell_delta"] = None
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_LOGGER.debug(
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"BMS data: %.2fV %.2fA %d%% %.2fAh %.3fkWh %d cells",
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data["voltage"], data["current"], data["state_of_charge"],
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data["residual_capacity"], data["energy_stored"],
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len(data["cell_voltages"]),
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)
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return data
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