276 lines
8.2 KiB
Python
276 lines
8.2 KiB
Python
"""Support for Generic Modbus Thermostats."""
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from datetime import timedelta
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import logging
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import struct
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from typing import Any, Dict, Optional
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from pymodbus.exceptions import ConnectionException, ModbusException
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from pymodbus.pdu import ExceptionResponse
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from homeassistant.components.climate import ClimateEntity
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from homeassistant.components.climate.const import (
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HVAC_MODE_AUTO,
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SUPPORT_TARGET_TEMPERATURE,
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)
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from homeassistant.const import (
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ATTR_TEMPERATURE,
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CONF_NAME,
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CONF_SCAN_INTERVAL,
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CONF_SLAVE,
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CONF_STRUCTURE,
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TEMP_CELSIUS,
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TEMP_FAHRENHEIT,
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)
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from homeassistant.helpers.event import async_track_time_interval
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from homeassistant.helpers.typing import (
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ConfigType,
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DiscoveryInfoType,
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HomeAssistantType,
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)
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from . import ModbusHub
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from .const import (
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CALL_TYPE_REGISTER_HOLDING,
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CALL_TYPE_REGISTER_INPUT,
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CONF_CLIMATES,
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CONF_CURRENT_TEMP,
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CONF_CURRENT_TEMP_REGISTER_TYPE,
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CONF_DATA_COUNT,
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CONF_DATA_TYPE,
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CONF_MAX_TEMP,
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CONF_MIN_TEMP,
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CONF_OFFSET,
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CONF_PRECISION,
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CONF_SCALE,
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CONF_STEP,
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CONF_TARGET_TEMP,
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CONF_UNIT,
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DATA_TYPE_CUSTOM,
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DEFAULT_STRUCT_FORMAT,
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MODBUS_DOMAIN,
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)
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_LOGGER = logging.getLogger(__name__)
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async def async_setup_platform(
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hass: HomeAssistantType,
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config: ConfigType,
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async_add_entities,
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discovery_info: Optional[DiscoveryInfoType] = None,
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):
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"""Read configuration and create Modbus climate."""
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if discovery_info is None:
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return
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entities = []
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for entity in discovery_info[CONF_CLIMATES]:
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hub: ModbusHub = hass.data[MODBUS_DOMAIN][discovery_info[CONF_NAME]]
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count = entity[CONF_DATA_COUNT]
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data_type = entity[CONF_DATA_TYPE]
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name = entity[CONF_NAME]
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structure = entity[CONF_STRUCTURE]
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if data_type != DATA_TYPE_CUSTOM:
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try:
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structure = f">{DEFAULT_STRUCT_FORMAT[data_type][count]}"
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except KeyError:
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_LOGGER.error(
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"Climate %s: Unable to find a data type matching count value %s, try a custom type",
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name,
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count,
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)
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continue
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try:
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size = struct.calcsize(structure)
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except struct.error as err:
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_LOGGER.error("Error in sensor %s structure: %s", name, err)
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continue
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if count * 2 != size:
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_LOGGER.error(
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"Structure size (%d bytes) mismatch registers count (%d words)",
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size,
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count,
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)
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continue
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entity[CONF_STRUCTURE] = structure
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entities.append(ModbusThermostat(hub, entity))
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async_add_entities(entities)
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class ModbusThermostat(ClimateEntity):
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"""Representation of a Modbus Thermostat."""
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def __init__(
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self,
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hub: ModbusHub,
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config: Dict[str, Any],
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):
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"""Initialize the modbus thermostat."""
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self._hub: ModbusHub = hub
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self._name = config[CONF_NAME]
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self._slave = config[CONF_SLAVE]
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self._target_temperature_register = config[CONF_TARGET_TEMP]
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self._current_temperature_register = config[CONF_CURRENT_TEMP]
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self._current_temperature_register_type = config[
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CONF_CURRENT_TEMP_REGISTER_TYPE
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]
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self._target_temperature = None
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self._current_temperature = None
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self._data_type = config[CONF_DATA_TYPE]
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self._structure = config[CONF_STRUCTURE]
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self._count = config[CONF_DATA_COUNT]
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self._precision = config[CONF_PRECISION]
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self._scale = config[CONF_SCALE]
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self._scan_interval = timedelta(seconds=config[CONF_SCAN_INTERVAL])
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self._offset = config[CONF_OFFSET]
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self._unit = config[CONF_UNIT]
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self._max_temp = config[CONF_MAX_TEMP]
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self._min_temp = config[CONF_MIN_TEMP]
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self._temp_step = config[CONF_STEP]
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self._available = True
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async def async_added_to_hass(self):
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"""Handle entity which will be added."""
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async_track_time_interval(
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self.hass, lambda arg: self._update(), self._scan_interval
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)
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@property
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def should_poll(self):
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"""Return True if entity has to be polled for state.
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False if entity pushes its state to HA.
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"""
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# Handle polling directly in this entity
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return False
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@property
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def supported_features(self):
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"""Return the list of supported features."""
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return SUPPORT_TARGET_TEMPERATURE
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@property
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def hvac_mode(self):
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"""Return the current HVAC mode."""
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return HVAC_MODE_AUTO
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@property
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def hvac_modes(self):
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"""Return the possible HVAC modes."""
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return [HVAC_MODE_AUTO]
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def set_hvac_mode(self, hvac_mode: str) -> None:
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"""Set new target hvac mode."""
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# Home Assistant expects this method.
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# We'll keep it here to avoid getting exceptions.
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@property
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def name(self):
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"""Return the name of the climate device."""
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return self._name
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@property
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def current_temperature(self):
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"""Return the current temperature."""
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return self._current_temperature
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@property
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def target_temperature(self):
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"""Return the target temperature."""
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return self._target_temperature
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@property
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def temperature_unit(self):
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"""Return the unit of measurement."""
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return TEMP_FAHRENHEIT if self._unit == "F" else TEMP_CELSIUS
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@property
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def min_temp(self):
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"""Return the minimum temperature."""
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return self._min_temp
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@property
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def max_temp(self):
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"""Return the maximum temperature."""
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return self._max_temp
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@property
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def target_temperature_step(self):
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"""Return the supported step of target temperature."""
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return self._temp_step
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def set_temperature(self, **kwargs):
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"""Set new target temperature."""
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target_temperature = int(
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(kwargs.get(ATTR_TEMPERATURE) - self._offset) / self._scale
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)
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if target_temperature is None:
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return
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byte_string = struct.pack(self._structure, target_temperature)
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register_value = struct.unpack(">h", byte_string[0:2])[0]
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self._write_register(self._target_temperature_register, register_value)
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self._update()
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@property
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def available(self) -> bool:
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"""Return True if entity is available."""
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return self._available
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def _update(self):
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"""Update Target & Current Temperature."""
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self._target_temperature = self._read_register(
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CALL_TYPE_REGISTER_HOLDING, self._target_temperature_register
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)
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self._current_temperature = self._read_register(
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self._current_temperature_register_type, self._current_temperature_register
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)
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self.schedule_update_ha_state()
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def _read_register(self, register_type, register) -> Optional[float]:
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"""Read register using the Modbus hub slave."""
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try:
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if register_type == CALL_TYPE_REGISTER_INPUT:
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result = self._hub.read_input_registers(
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self._slave, register, self._count
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)
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else:
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result = self._hub.read_holding_registers(
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self._slave, register, self._count
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)
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except ConnectionException:
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self._available = False
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return
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if isinstance(result, (ModbusException, ExceptionResponse)):
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self._available = False
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return
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byte_string = b"".join(
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[x.to_bytes(2, byteorder="big") for x in result.registers]
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)
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val = struct.unpack(self._structure, byte_string)[0]
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register_value = format(
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(self._scale * val) + self._offset, f".{self._precision}f"
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)
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register_value = float(register_value)
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self._available = True
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return register_value
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def _write_register(self, register, value):
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"""Write holding register using the Modbus hub slave."""
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try:
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self._hub.write_registers(self._slave, register, [value, 0])
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except ConnectionException:
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self._available = False
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return
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self._available = True
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