131 lines
4.2 KiB
Python
131 lines
4.2 KiB
Python
"""
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Support for MQTT switches.
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/switch.mqtt/
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"""
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import logging
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import voluptuous as vol
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from homeassistant.components.mqtt import (
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CONF_STATE_TOPIC, CONF_COMMAND_TOPIC, CONF_QOS, CONF_RETAIN)
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from homeassistant.components.switch import SwitchDevice
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from homeassistant.const import (
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CONF_NAME, CONF_OPTIMISTIC, CONF_VALUE_TEMPLATE, CONF_PAYLOAD_OFF,
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CONF_PAYLOAD_ON)
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import homeassistant.components.mqtt as mqtt
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import homeassistant.helpers.config_validation as cv
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_LOGGER = logging.getLogger(__name__)
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DEPENDENCIES = ['mqtt']
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DEFAULT_NAME = 'MQTT Switch'
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DEFAULT_PAYLOAD_ON = 'ON'
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DEFAULT_PAYLOAD_OFF = 'OFF'
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DEFAULT_OPTIMISTIC = False
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PLATFORM_SCHEMA = mqtt.MQTT_RW_PLATFORM_SCHEMA.extend({
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_PAYLOAD_ON, default=DEFAULT_PAYLOAD_ON): cv.string,
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vol.Optional(CONF_PAYLOAD_OFF, default=DEFAULT_PAYLOAD_OFF): cv.string,
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vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
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})
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# pylint: disable=unused-argument
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def setup_platform(hass, config, add_devices, discovery_info=None):
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"""Setup the MQTT switch."""
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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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add_devices([MqttSwitch(
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hass,
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config.get(CONF_NAME),
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config.get(CONF_STATE_TOPIC),
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config.get(CONF_COMMAND_TOPIC),
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config.get(CONF_QOS),
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config.get(CONF_RETAIN),
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config.get(CONF_PAYLOAD_ON),
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config.get(CONF_PAYLOAD_OFF),
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config.get(CONF_OPTIMISTIC),
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value_template,
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)])
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# pylint: disable=too-many-arguments, too-many-instance-attributes
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class MqttSwitch(SwitchDevice):
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"""Representation of a switch that can be toggled using MQTT."""
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def __init__(self, hass, name, state_topic, command_topic, qos, retain,
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payload_on, payload_off, optimistic, value_template):
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"""Initialize the MQTT switch."""
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self._state = False
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self._hass = hass
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self._name = name
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self._state_topic = state_topic
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self._command_topic = command_topic
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self._qos = qos
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self._retain = retain
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self._payload_on = payload_on
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self._payload_off = payload_off
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self._optimistic = optimistic
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def message_received(topic, payload, qos):
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"""A new MQTT message has been received."""
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if value_template is not None:
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payload = value_template.render_with_possible_json_value(
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payload)
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if payload == self._payload_on:
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self._state = True
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self.update_ha_state()
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elif payload == self._payload_off:
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self._state = False
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self.update_ha_state()
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if self._state_topic is None:
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# Force into optimistic mode.
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self._optimistic = True
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else:
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mqtt.subscribe(
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hass, self._state_topic, message_received, self._qos)
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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 name(self):
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"""Return the name of the switch."""
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return self._name
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@property
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def is_on(self):
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"""Return true if device is on."""
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return self._state
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@property
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def assumed_state(self):
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"""Return true if we do optimistic updates."""
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return self._optimistic
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def turn_on(self, **kwargs):
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"""Turn the device on."""
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mqtt.publish(self.hass, self._command_topic, self._payload_on,
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self._qos, self._retain)
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if self._optimistic:
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# Optimistically assume that switch has changed state.
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self._state = True
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self.update_ha_state()
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def turn_off(self, **kwargs):
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"""Turn the device off."""
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mqtt.publish(self.hass, self._command_topic, self._payload_off,
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self._qos, self._retain)
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if self._optimistic:
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# Optimistically assume that switch has changed state.
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self._state = False
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self.update_ha_state()
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