homie dsmr first try

app_settings.py

@@ -0,0 +1,29 @@
+from pydantic import BaseSettings, Field
+import homie
+
+VERSION = "0.1.0"
+
+
+class Settings(BaseSettings):
+    """Application settings for the DSMR MQTT bridge."""
+
+    loglevel: str = Field('INFO', env='LOGLEVEL')
+
+    mqtt_host: str = Field(None, env='MQTT_HOST')
+    mqtt_port: int = Field(1883, env='MQTT_PORT')
+    mqtt_username: str = Field(None, env='MQTT_USERNAME')
+    mqtt_password: str = Field(None, env='MQTT_PASSWORD')
+
+    dsmr_port: str = Field('/dev/ttyUSB0', env='DSMR_PORT')
+    dsmr_protocol: str = Field('V5', env='DSMR_PROTOCOL')
+
+    homie_update_interval: int = 60
+    homie_topic: str = Field('homie', env='HOMIE_TOPIC')
+    homie_implementation: str \
+        = f"DSMR Homie {VERSION} Homie 4 Version {homie.__version__}"
+    homie_fw_name: str = "DSMR"
+    homie_fw_version: str = VERSION
+
+    class Config:
+        """Where to find the environment file containing the settings."""
+        env_file = '.env'