Added ELV PCA 301 smart emeter switch (#23300)

* added pca

* removed req from py

* try to fix codeowners

* redo req

* ran codeowners

* processed comments

* fix style

* fix style

* fix style

* Set availalbe to False when communication fails.

.coveragerc

@@ -157,6 +157,7 @@ omit =
     homeassistant/components/eight_sleep/*
     homeassistant/components/eliqonline/sensor.py
     homeassistant/components/elkm1/*
+    homeassistant/components/elv/switch.py
     homeassistant/components/emby/media_player.py
     homeassistant/components/emoncms/sensor.py
     homeassistant/components/emoncms_history/*

CODEOWNERS

@@ -72,6 +72,7 @@ homeassistant/components/ecovacs/* @OverloadUT
 homeassistant/components/edp_redy/* @abmantis
 homeassistant/components/egardia/* @jeroenterheerdt
 homeassistant/components/eight_sleep/* @mezz64
+homeassistant/components/elv/* @majuss
 homeassistant/components/emby/* @mezz64
 homeassistant/components/enigma2/* @fbradyirl
 homeassistant/components/enocean/* @bdurrer

homeassistant/components/elv/manifest.json

@@ -0,0 +1,8 @@
+{
+    "domain": "elv",
+    "name": "ELV PCA",
+    "documentation": "https://www.home-assistant.io/components/pca",
+    "dependencies": [],
+    "codeowners": ["@majuss"],
+    "requirements": ["pypca==0.0.4"]
+  }

homeassistant/components/elv/switch.py

@@ -0,0 +1,103 @@
+"""Support for PCA 301 smart switch."""
+import logging
+
+import voluptuous as vol
+
+from homeassistant.components.switch import (
+    SwitchDevice, PLATFORM_SCHEMA, ATTR_CURRENT_POWER_W)
+from homeassistant.const import (
+    CONF_NAME, CONF_DEVICE, EVENT_HOMEASSISTANT_STOP)
+import homeassistant.helpers.config_validation as cv
+
+_LOGGER = logging.getLogger(__name__)
+
+ATTR_TOTAL_ENERGY_KWH = 'total_energy_kwh'
+
+DEFAULT_NAME = 'PCA 301'
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+    vol.Required(CONF_DEVICE): cv.string
+})
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the PCA switch platform."""
+    import pypca
+    from serial import SerialException
+
+    name = config[CONF_NAME]
+    usb_device = config[CONF_DEVICE]
+
+    try:
+        pca = pypca.PCA(usb_device)
+        pca.open()
+        entities = [SmartPlugSwitch(pca, device, name)
+                    for device in pca.get_devices()]
+        add_entities(entities, True)
+
+    except SerialException as exc:
+        _LOGGER.warning("Unable to open serial port: %s", exc)
+        return
+
+    hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, pca.close)
+
+    pca.start_scan()
+
+
+class SmartPlugSwitch(SwitchDevice):
+    """Representation of a PCA Smart Plug switch."""
+
+    def __init__(self, pca, device_id, name):
+        """Initialize the switch."""
+        self._device_id = device_id
+        self._name = name
+        self._state = None
+        self._available = True
+        self._emeter_params = {}
+        self._pca = pca
+
+    @property
+    def name(self):
+        """Return the name of the Smart Plug, if any."""
+        return self._name
+
+    @property
+    def available(self) -> bool:
+        """Return if switch is available."""
+        return self._available
+
+    @property
+    def is_on(self):
+        """Return true if switch is on."""
+        return self._state
+
+    def turn_on(self, **kwargs):
+        """Turn the switch on."""
+        self._pca.turn_on(self._device_id)
+
+    def turn_off(self, **kwargs):
+        """Turn the switch off."""
+        self._pca.turn_off(self._device_id)
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes of the device."""
+        return self._emeter_params
+
+    def update(self):
+        """Update the PCA switch's state."""
+        try:
+            self._emeter_params[ATTR_CURRENT_POWER_W] = "{:.1f}".format(
+                self._pca.get_current_power(self._device_id))
+            self._emeter_params[ATTR_TOTAL_ENERGY_KWH] = "{:.2f}".format(
+                self._pca.get_total_consumption(self._device_id))
+
+            self._available = True
+            self._state = self._pca.get_state(self._device_id)
+
+        except (OSError) as ex:
+            if self._available:
+                _LOGGER.warning(
+                    "Could not read state for %s: %s", self.name, ex)
+                self._available = False

requirements_all.txt

@@ -1290,6 +1290,9 @@ pyowlet==1.0.2
 # homeassistant.components.openweathermap
 pyowm==2.10.0
 
+# homeassistant.components.elv
+pypca==0.0.4
+
 # homeassistant.components.lcn
 pypck==0.6.1