82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
"""Support for Modbus Register sensors."""
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from __future__ import annotations
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from datetime import datetime
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from typing import Any
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from homeassistant.components.sensor import CONF_STATE_CLASS, SensorEntity
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from homeassistant.const import CONF_NAME, CONF_SENSORS, CONF_UNIT_OF_MEASUREMENT
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from homeassistant.core import HomeAssistant
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from homeassistant.helpers.entity_platform import AddEntitiesCallback
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from homeassistant.helpers.restore_state import RestoreEntity
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from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
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from . import get_hub
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from .base_platform import BaseStructPlatform
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from .modbus import ModbusHub
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PARALLEL_UPDATES = 1
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async def async_setup_platform(
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hass: HomeAssistant,
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config: ConfigType,
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async_add_entities: AddEntitiesCallback,
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discovery_info: DiscoveryInfoType | None = None,
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) -> None:
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"""Set up the Modbus sensors."""
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sensors = []
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if discovery_info is None: # pragma: no cover
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return
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for entry in discovery_info[CONF_SENSORS]:
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hub = get_hub(hass, discovery_info[CONF_NAME])
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sensors.append(ModbusRegisterSensor(hub, entry))
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async_add_entities(sensors)
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class ModbusRegisterSensor(BaseStructPlatform, RestoreEntity, SensorEntity):
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"""Modbus register sensor."""
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def __init__(
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self,
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hub: ModbusHub,
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entry: dict[str, Any],
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) -> None:
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"""Initialize the modbus register sensor."""
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super().__init__(hub, entry)
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self._attr_native_unit_of_measurement = entry.get(CONF_UNIT_OF_MEASUREMENT)
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self._attr_state_class = entry.get(CONF_STATE_CLASS)
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async def async_added_to_hass(self) -> None:
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"""Handle entity which will be added."""
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await self.async_base_added_to_hass()
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if state := await self.async_get_last_state():
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self._attr_native_value = state.state
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async def async_update(self, now: datetime | None = None) -> None:
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"""Update the state of the sensor."""
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# remark "now" is a dummy parameter to avoid problems with
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# async_track_time_interval
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result = await self._hub.async_pymodbus_call(
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self._slave, self._address, self._count, self._input_type
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)
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if result is None:
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if self._lazy_errors:
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self._lazy_errors -= 1
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return
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self._lazy_errors = self._lazy_error_count
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self._attr_available = False
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self.async_write_ha_state()
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return
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self._attr_native_value = self.unpack_structure_result(result.registers)
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if self._attr_native_value is None:
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self._attr_available = False
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else:
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self._attr_available = True
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self._lazy_errors = self._lazy_error_count
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self.async_write_ha_state()
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