238 lines
7.2 KiB
Python
238 lines
7.2 KiB
Python
"""Support for Modbus Register sensors."""
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import logging
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import struct
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from typing import Any, Union
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import voluptuous as vol
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.const import (
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CONF_NAME,
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CONF_OFFSET,
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CONF_SLAVE,
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CONF_STRUCTURE,
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CONF_UNIT_OF_MEASUREMENT,
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)
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from homeassistant.helpers import config_validation as cv
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from homeassistant.helpers.restore_state import RestoreEntity
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from . import CONF_HUB, DEFAULT_HUB, DOMAIN as MODBUS_DOMAIN
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_LOGGER = logging.getLogger(__name__)
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CONF_COUNT = "count"
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CONF_DATA_TYPE = "data_type"
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CONF_PRECISION = "precision"
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CONF_REGISTER = "register"
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CONF_REGISTER_TYPE = "register_type"
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CONF_REGISTERS = "registers"
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CONF_REVERSE_ORDER = "reverse_order"
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CONF_SCALE = "scale"
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DATA_TYPE_CUSTOM = "custom"
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DATA_TYPE_FLOAT = "float"
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DATA_TYPE_INT = "int"
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DATA_TYPE_UINT = "uint"
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REGISTER_TYPE_HOLDING = "holding"
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REGISTER_TYPE_INPUT = "input"
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def number(value: Any) -> Union[int, float]:
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"""Coerce a value to number without losing precision."""
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if isinstance(value, int):
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return value
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if isinstance(value, str):
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try:
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value = int(value)
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return value
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except (TypeError, ValueError):
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pass
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try:
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value = float(value)
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return value
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except (TypeError, ValueError):
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raise vol.Invalid(f"invalid number {value}")
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Required(CONF_REGISTERS): [
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{
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vol.Required(CONF_NAME): cv.string,
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vol.Required(CONF_REGISTER): cv.positive_int,
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vol.Optional(CONF_COUNT, default=1): cv.positive_int,
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vol.Optional(CONF_DATA_TYPE, default=DATA_TYPE_INT): vol.In(
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[DATA_TYPE_INT, DATA_TYPE_UINT, DATA_TYPE_FLOAT, DATA_TYPE_CUSTOM]
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),
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vol.Optional(CONF_HUB, default=DEFAULT_HUB): cv.string,
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vol.Optional(CONF_OFFSET, default=0): number,
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vol.Optional(CONF_PRECISION, default=0): cv.positive_int,
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vol.Optional(CONF_REGISTER_TYPE, default=REGISTER_TYPE_HOLDING): vol.In(
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[REGISTER_TYPE_HOLDING, REGISTER_TYPE_INPUT]
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),
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vol.Optional(CONF_REVERSE_ORDER, default=False): cv.boolean,
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vol.Optional(CONF_SCALE, default=1): number,
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vol.Optional(CONF_SLAVE): cv.positive_int,
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vol.Optional(CONF_STRUCTURE): cv.string,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
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}
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]
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}
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)
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def setup_platform(hass, config, add_entities, discovery_info=None):
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"""Set up the Modbus sensors."""
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sensors = []
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data_types = {DATA_TYPE_INT: {1: "h", 2: "i", 4: "q"}}
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data_types[DATA_TYPE_UINT] = {1: "H", 2: "I", 4: "Q"}
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data_types[DATA_TYPE_FLOAT] = {1: "e", 2: "f", 4: "d"}
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for register in config.get(CONF_REGISTERS):
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structure = ">i"
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if register.get(CONF_DATA_TYPE) != DATA_TYPE_CUSTOM:
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try:
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structure = ">{}".format(
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data_types[register.get(CONF_DATA_TYPE)][register.get(CONF_COUNT)]
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)
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except KeyError:
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_LOGGER.error(
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"Unable to detect data type for %s sensor, " "try a custom type",
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register.get(CONF_NAME),
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)
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continue
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else:
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structure = register.get(CONF_STRUCTURE)
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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(
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"Error in sensor %s structure: %s", register.get(CONF_NAME), err
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)
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continue
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if register.get(CONF_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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register.get(CONF_COUNT),
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)
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continue
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hub_name = register.get(CONF_HUB)
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hub = hass.data[MODBUS_DOMAIN][hub_name]
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sensors.append(
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ModbusRegisterSensor(
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hub,
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register.get(CONF_NAME),
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register.get(CONF_SLAVE),
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register.get(CONF_REGISTER),
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register.get(CONF_REGISTER_TYPE),
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register.get(CONF_UNIT_OF_MEASUREMENT),
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register.get(CONF_COUNT),
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register.get(CONF_REVERSE_ORDER),
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register.get(CONF_SCALE),
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register.get(CONF_OFFSET),
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structure,
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register.get(CONF_PRECISION),
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)
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)
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if not sensors:
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return False
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add_entities(sensors)
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class ModbusRegisterSensor(RestoreEntity):
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"""Modbus register sensor."""
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def __init__(
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self,
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hub,
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name,
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slave,
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register,
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register_type,
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unit_of_measurement,
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count,
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reverse_order,
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scale,
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offset,
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structure,
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precision,
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):
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"""Initialize the modbus register sensor."""
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self._hub = hub
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self._name = name
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self._slave = int(slave) if slave else None
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self._register = int(register)
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self._register_type = register_type
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self._unit_of_measurement = unit_of_measurement
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self._count = int(count)
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self._reverse_order = reverse_order
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self._scale = scale
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self._offset = offset
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self._precision = precision
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self._structure = structure
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self._value = None
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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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state = await self.async_get_last_state()
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if not state:
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return
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self._value = state.state
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@property
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def state(self):
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"""Return the state of the sensor."""
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return self._value
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@property
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def name(self):
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"""Return the name of the sensor."""
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return self._name
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@property
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def unit_of_measurement(self):
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"""Return the unit of measurement."""
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return self._unit_of_measurement
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def update(self):
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"""Update the state of the sensor."""
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if self._register_type == REGISTER_TYPE_INPUT:
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result = self._hub.read_input_registers(
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self._slave, self._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, self._register, self._count
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)
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val = 0
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try:
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registers = result.registers
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if self._reverse_order:
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registers.reverse()
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except AttributeError:
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_LOGGER.error(
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"No response from hub %s, slave %s, register %s",
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self._hub.name,
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self._slave,
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self._register,
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)
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return
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byte_string = b"".join([x.to_bytes(2, byteorder="big") for x in registers])
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val = struct.unpack(self._structure, byte_string)[0]
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val = self._scale * val + self._offset
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if isinstance(val, int):
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self._value = str(val)
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if self._precision > 0:
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self._value += "." + "0" * self._precision
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else:
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self._value = f"{val:.{self._precision}f}"
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