113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
"""Support for reading data from a serial port."""
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import json
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import logging
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import serial_asyncio
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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 CONF_NAME, CONF_VALUE_TEMPLATE, EVENT_HOMEASSISTANT_STOP
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import homeassistant.helpers.config_validation as cv
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from homeassistant.helpers.entity import Entity
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_LOGGER = logging.getLogger(__name__)
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CONF_SERIAL_PORT = "serial_port"
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CONF_BAUDRATE = "baudrate"
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DEFAULT_NAME = "Serial Sensor"
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DEFAULT_BAUDRATE = 9600
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Required(CONF_SERIAL_PORT): cv.string,
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vol.Optional(CONF_BAUDRATE, default=DEFAULT_BAUDRATE): cv.positive_int,
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
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}
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)
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async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
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"""Set up the Serial sensor platform."""
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name = config.get(CONF_NAME)
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port = config.get(CONF_SERIAL_PORT)
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baudrate = config.get(CONF_BAUDRATE)
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value_template = config.get(CONF_VALUE_TEMPLATE)
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if value_template is not None:
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value_template.hass = hass
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sensor = SerialSensor(name, port, baudrate, value_template)
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hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, sensor.stop_serial_read())
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async_add_entities([sensor], True)
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class SerialSensor(Entity):
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"""Representation of a Serial sensor."""
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def __init__(self, name, port, baudrate, value_template):
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"""Initialize the Serial sensor."""
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self._name = name
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self._state = None
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self._port = port
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self._baudrate = baudrate
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self._serial_loop_task = None
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self._template = value_template
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self._attributes = []
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async def async_added_to_hass(self):
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"""Handle when an entity is about to be added to Home Assistant."""
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self._serial_loop_task = self.hass.loop.create_task(
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self.serial_read(self._port, self._baudrate)
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)
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async def serial_read(self, device, rate, **kwargs):
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"""Read the data from the port."""
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reader, _ = await serial_asyncio.open_serial_connection(
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url=device, baudrate=rate, **kwargs
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)
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while True:
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line = await reader.readline()
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line = line.decode("utf-8").strip()
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try:
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data = json.loads(line)
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if isinstance(data, dict):
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self._attributes = data
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except ValueError:
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pass
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if self._template is not None:
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line = self._template.async_render_with_possible_json_value(line)
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_LOGGER.debug("Received: %s", line)
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self._state = line
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self.async_schedule_update_ha_state()
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async def stop_serial_read(self):
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"""Close resources."""
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if self._serial_loop_task:
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self._serial_loop_task.cancel()
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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 should_poll(self):
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"""No polling needed."""
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return False
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@property
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def device_state_attributes(self):
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"""Return the attributes of the entity (if any JSON present)."""
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return self._attributes
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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._state
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