Add support for DHT and DS18B20 sensors via Konnected firmware (#21189)

* mvp basic temperature sensor support

* support for DHT temperature & humidity

* add support for ds18b20 sensors

* improve resolution of device settings

* update requirements_all.txt

* re-organize new file

* don't use filter(lambda: syntax

* set unique_id on entities to allow renaming in the UI

* leverage base Entity module to do C to F conversion

* add option for setting poll_interval

* use handler pattern to handle updates from Konnected device

* cleanups from code review

homeassistant/components/konnected/const.py

@@ -0,0 +1,27 @@
+"""Konnected constants."""
+
+DOMAIN = 'konnected'
+
+CONF_ACTIVATION = 'activation'
+CONF_API_HOST = 'api_host'
+CONF_MOMENTARY = 'momentary'
+CONF_PAUSE = 'pause'
+CONF_POLL_INTERVAL = 'poll_interval'
+CONF_PRECISION = 'precision'
+CONF_REPEAT = 'repeat'
+CONF_INVERSE = 'inverse'
+CONF_BLINK = 'blink'
+CONF_DISCOVERY = 'discovery'
+CONF_DHT_SENSORS = 'dht_sensors'
+CONF_DS18B20_SENSORS = 'ds18b20_sensors'
+
+STATE_LOW = 'low'
+STATE_HIGH = 'high'
+
+PIN_TO_ZONE = {1: 1, 2: 2, 5: 3, 6: 4, 7: 5, 8: 'out', 9: 6}
+ZONE_TO_PIN = {zone: pin for pin, zone in PIN_TO_ZONE.items()}
+
+ENDPOINT_ROOT = '/api/konnected'
+UPDATE_ENDPOINT = (ENDPOINT_ROOT + r'/device/{device_id:[a-zA-Z0-9]+}')
+SIGNAL_SENSOR_UPDATE = 'konnected.{}.update'
+SIGNAL_DS18B20_NEW = 'konnected.ds18b20.new'