314 lines
10 KiB
Python
314 lines
10 KiB
Python
"""Support for Modbus."""
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import asyncio
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import logging
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from async_timeout import timeout
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from pymodbus.client.asynchronous import schedulers
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from pymodbus.client.asynchronous.serial import AsyncModbusSerialClient as ClientSerial
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from pymodbus.client.asynchronous.tcp import AsyncModbusTCPClient as ClientTCP
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from pymodbus.client.asynchronous.udp import AsyncModbusUDPClient as ClientUDP
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from pymodbus.exceptions import ModbusException
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from pymodbus.pdu import ExceptionResponse
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from pymodbus.transaction import ModbusRtuFramer
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import voluptuous as vol
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from homeassistant.const import (
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ATTR_STATE,
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CONF_DELAY,
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CONF_HOST,
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CONF_METHOD,
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CONF_NAME,
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CONF_PORT,
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CONF_TIMEOUT,
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CONF_TYPE,
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EVENT_HOMEASSISTANT_STOP,
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)
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import homeassistant.helpers.config_validation as cv
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from .const import (
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ATTR_ADDRESS,
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ATTR_HUB,
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ATTR_UNIT,
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ATTR_VALUE,
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CONF_BAUDRATE,
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CONF_BYTESIZE,
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CONF_PARITY,
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CONF_STOPBITS,
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DEFAULT_HUB,
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MODBUS_DOMAIN as DOMAIN,
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SERVICE_WRITE_COIL,
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SERVICE_WRITE_REGISTER,
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)
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_LOGGER = logging.getLogger(__name__)
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BASE_SCHEMA = vol.Schema({vol.Optional(CONF_NAME, default=DEFAULT_HUB): cv.string})
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SERIAL_SCHEMA = BASE_SCHEMA.extend(
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{
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vol.Required(CONF_BAUDRATE): cv.positive_int,
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vol.Required(CONF_BYTESIZE): vol.Any(5, 6, 7, 8),
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vol.Required(CONF_METHOD): vol.Any("rtu", "ascii"),
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vol.Required(CONF_PORT): cv.string,
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vol.Required(CONF_PARITY): vol.Any("E", "O", "N"),
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vol.Required(CONF_STOPBITS): vol.Any(1, 2),
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vol.Required(CONF_TYPE): "serial",
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vol.Optional(CONF_TIMEOUT, default=3): cv.socket_timeout,
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}
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)
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ETHERNET_SCHEMA = BASE_SCHEMA.extend(
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{
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vol.Required(CONF_HOST): cv.string,
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vol.Required(CONF_PORT): cv.port,
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vol.Required(CONF_TYPE): vol.Any("tcp", "udp", "rtuovertcp"),
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vol.Optional(CONF_TIMEOUT, default=3): cv.socket_timeout,
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vol.Optional(CONF_DELAY, default=0): cv.positive_int,
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}
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)
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CONFIG_SCHEMA = vol.Schema(
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{DOMAIN: vol.All(cv.ensure_list, [vol.Any(SERIAL_SCHEMA, ETHERNET_SCHEMA)])},
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extra=vol.ALLOW_EXTRA,
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)
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SERVICE_WRITE_REGISTER_SCHEMA = vol.Schema(
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{
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vol.Optional(ATTR_HUB, default=DEFAULT_HUB): cv.string,
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vol.Required(ATTR_UNIT): cv.positive_int,
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vol.Required(ATTR_ADDRESS): cv.positive_int,
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vol.Required(ATTR_VALUE): vol.Any(
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cv.positive_int, vol.All(cv.ensure_list, [cv.positive_int])
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),
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}
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)
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SERVICE_WRITE_COIL_SCHEMA = vol.Schema(
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{
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vol.Optional(ATTR_HUB, default=DEFAULT_HUB): cv.string,
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vol.Required(ATTR_UNIT): cv.positive_int,
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vol.Required(ATTR_ADDRESS): cv.positive_int,
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vol.Required(ATTR_STATE): cv.boolean,
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}
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)
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async def async_setup(hass, config):
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"""Set up Modbus component."""
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hass.data[DOMAIN] = hub_collect = {}
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for client_config in config[DOMAIN]:
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hub_collect[client_config[CONF_NAME]] = ModbusHub(client_config, hass.loop)
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def stop_modbus(event):
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"""Stop Modbus service."""
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for client in hub_collect.values():
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del client
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def start_modbus():
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"""Start Modbus service."""
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for client in hub_collect.values():
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client.setup()
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hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, stop_modbus)
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async def write_register(service):
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"""Write Modbus registers."""
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unit = int(float(service.data[ATTR_UNIT]))
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address = int(float(service.data[ATTR_ADDRESS]))
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value = service.data[ATTR_VALUE]
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client_name = service.data[ATTR_HUB]
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if isinstance(value, list):
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await hub_collect[client_name].write_registers(
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unit, address, [int(float(i)) for i in value]
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)
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else:
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await hub_collect[client_name].write_register(
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unit, address, int(float(value))
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)
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async def write_coil(service):
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"""Write Modbus coil."""
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unit = service.data[ATTR_UNIT]
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address = service.data[ATTR_ADDRESS]
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state = service.data[ATTR_STATE]
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client_name = service.data[ATTR_HUB]
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await hub_collect[client_name].write_coil(unit, address, state)
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# do not wait for EVENT_HOMEASSISTANT_START, activate pymodbus now
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await hass.async_add_executor_job(start_modbus)
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# Register services for modbus
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hass.services.async_register(
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DOMAIN,
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SERVICE_WRITE_REGISTER,
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write_register,
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schema=SERVICE_WRITE_REGISTER_SCHEMA,
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)
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hass.services.async_register(
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DOMAIN, SERVICE_WRITE_COIL, write_coil, schema=SERVICE_WRITE_COIL_SCHEMA,
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)
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return True
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class ModbusHub:
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"""Thread safe wrapper class for pymodbus."""
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def __init__(self, client_config, main_loop):
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"""Initialize the Modbus hub."""
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# generic configuration
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self._loop = main_loop
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self._client = None
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self._lock = asyncio.Lock()
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self._config_name = client_config[CONF_NAME]
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self._config_type = client_config[CONF_TYPE]
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self._config_port = client_config[CONF_PORT]
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self._config_timeout = client_config[CONF_TIMEOUT]
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self._config_delay = 0
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if self._config_type == "serial":
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# serial configuration
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self._config_method = client_config[CONF_METHOD]
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self._config_baudrate = client_config[CONF_BAUDRATE]
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self._config_stopbits = client_config[CONF_STOPBITS]
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self._config_bytesize = client_config[CONF_BYTESIZE]
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self._config_parity = client_config[CONF_PARITY]
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else:
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# network configuration
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self._config_host = client_config[CONF_HOST]
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self._config_delay = client_config[CONF_DELAY]
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@property
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def name(self):
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"""Return the name of this hub."""
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return self._config_name
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async def _connect_delay(self):
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if self._config_delay > 0:
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await asyncio.sleep(self._config_delay)
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self._config_delay = 0
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def setup(self):
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"""Set up pymodbus client."""
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# pylint: disable = E0633
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# Client* do deliver loop, client as result but
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# pylint does not accept that fact
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if self._config_type == "serial":
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_, self._client = ClientSerial(
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schedulers.ASYNC_IO,
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method=self._config_method,
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port=self._config_port,
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baudrate=self._config_baudrate,
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stopbits=self._config_stopbits,
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bytesize=self._config_bytesize,
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parity=self._config_parity,
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loop=self._loop,
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)
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elif self._config_type == "rtuovertcp":
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_, self._client = ClientTCP(
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schedulers.ASYNC_IO,
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host=self._config_host,
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port=self._config_port,
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framer=ModbusRtuFramer,
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timeout=self._config_timeout,
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loop=self._loop,
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)
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elif self._config_type == "tcp":
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_, self._client = ClientTCP(
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schedulers.ASYNC_IO,
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host=self._config_host,
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port=self._config_port,
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timeout=self._config_timeout,
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loop=self._loop,
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)
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elif self._config_type == "udp":
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_, self._client = ClientUDP(
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schedulers.ASYNC_IO,
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host=self._config_host,
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port=self._config_port,
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timeout=self._config_timeout,
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loop=self._loop,
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)
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else:
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assert False
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async def _read(self, unit, address, count, func):
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"""Read generic with error handling."""
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await self._connect_delay()
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async with self._lock:
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kwargs = {"unit": unit} if unit else {}
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try:
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async with timeout(self._config_timeout):
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result = await func(address, count, **kwargs)
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except asyncio.TimeoutError:
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result = None
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if isinstance(result, (ModbusException, ExceptionResponse)):
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_LOGGER.error("Hub %s Exception (%s)", self._config_name, result)
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return result
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async def _write(self, unit, address, value, func):
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"""Read generic with error handling."""
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await self._connect_delay()
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async with self._lock:
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kwargs = {"unit": unit} if unit else {}
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try:
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async with timeout(self._config_timeout):
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func(address, value, **kwargs)
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except asyncio.TimeoutError:
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return
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async def read_coils(self, unit, address, count):
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"""Read coils."""
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if self._client.protocol is None:
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return None
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return await self._read(unit, address, count, self._client.protocol.read_coils)
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async def read_discrete_inputs(self, unit, address, count):
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"""Read discrete inputs."""
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if self._client.protocol is None:
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return None
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return await self._read(
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unit, address, count, self._client.protocol.read_discrete_inputs
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)
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async def read_input_registers(self, unit, address, count):
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"""Read input registers."""
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if self._client.protocol is None:
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return None
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return await self._read(
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unit, address, count, self._client.protocol.read_input_registers
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)
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async def read_holding_registers(self, unit, address, count):
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"""Read holding registers."""
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if self._client.protocol is None:
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return None
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return await self._read(
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unit, address, count, self._client.protocol.read_holding_registers
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)
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async def write_coil(self, unit, address, value):
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"""Write coil."""
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if self._client.protocol is None:
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return None
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return await self._write(unit, address, value, self._client.protocol.write_coil)
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async def write_register(self, unit, address, value):
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"""Write register."""
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if self._client.protocol is None:
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return None
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return await self._write(
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unit, address, value, self._client.protocol.write_register
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)
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async def write_registers(self, unit, address, values):
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"""Write registers."""
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if self._client.protocol is None:
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return None
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return await self._write(
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unit, address, values, self._client.protocol.write_registers
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)
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