Add config flow and MQTT autodiscover to dsmr_reader integration (#71617)

Co-authored-by: J. Nick Koston <nick@koston.org>
Co-authored-by: G Johansson <goran.johansson@shiftit.se>
Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

homeassistant/components/dsmr_reader/sensor.py

@@ -3,15 +3,16 @@ from __future__ import annotations
 
 from homeassistant.components import mqtt
 from homeassistant.components.sensor import SensorEntity
+from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntry
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.issue_registry import IssueSeverity, async_create_issue
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 from homeassistant.util import slugify
 
+from .const import DOMAIN
 from .definitions import SENSORS, DSMRReaderSensorEntityDescription
 
-DOMAIN = "dsmr_reader"
-
 
 async def async_setup_platform(
     hass: HomeAssistant,
@@ -19,7 +20,31 @@ async def async_setup_platform(
     async_add_entities: AddEntitiesCallback,
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
-    """Set up DSMR Reader sensors."""
+    """Set up DSMR Reader sensors via configuration.yaml and show deprecation warning."""
+    async_create_issue(
+        hass,
+        DOMAIN,
+        "deprecated_yaml",
+        breaks_in_ha_version="2022.12.0",
+        is_fixable=False,
+        severity=IssueSeverity.WARNING,
+        translation_key="deprecated_yaml",
+    )
+    hass.async_create_task(
+        hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={"source": SOURCE_IMPORT},
+            data=config,
+        )
+    )
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up DSMR Reader sensors from config entry."""
     async_add_entities(DSMRSensor(description) for description in SENSORS)