Fix HomeAssistant autodiscovery not working with HomeAssistant v0.69+

Fixes #42

miflora-mqtt-daemon.py

@@ -21,11 +21,11 @@ project_name = 'Xiaomi Mi Flora Plant Sensor MQTT Client/Daemon'
 project_url = 'https://github.com/ThomDietrich/miflora-mqtt-daemon'
 
 parameters = OrderedDict([
-    (MI_LIGHT, dict(name="LightIntensity", name_pretty='Sunlight Intensity', typeformat='%d', unit='lux')),
-    (MI_TEMPERATURE, dict(name="AirTemperature", name_pretty='Air Temperature', typeformat='%.1f', unit='°C')),
-    (MI_MOISTURE, dict(name="SoilMoisture", name_pretty='Soil Moisture', typeformat='%d', unit='%')),
+    (MI_LIGHT, dict(name="LightIntensity", name_pretty='Sunlight Intensity', typeformat='%d', unit='lux', device_class="illuminance")),
+    (MI_TEMPERATURE, dict(name="AirTemperature", name_pretty='Air Temperature', typeformat='%.1f', unit='°C', device_class="temperature")),
+    (MI_MOISTURE, dict(name="SoilMoisture", name_pretty='Soil Moisture', typeformat='%d', unit='%', device_class="humidity")),
     (MI_CONDUCTIVITY, dict(name="SoilConductivity", name_pretty='Soil Conductivity/Fertility', typeformat='%d', unit='µS/cm')),
-    (MI_BATTERY, dict(name="Battery", name_pretty='Sensor Battery Level', typeformat='%d', unit='%'))
+    (MI_BATTERY, dict(name="Battery", name_pretty='Sensor Battery Level', typeformat='%d', unit='%', device_class="battery"))
 ])
 
 if False:
@@ -287,7 +287,6 @@ elif reporting_mode == 'homeassistant-mqtt':
     for [flora_name, flora] in flores.items():
         topic_path = '{}/sensor/{}'.format(base_topic, flora_name)
         base_payload = {
-            "device_class": "sensor",
             "state_topic": "{}/state".format(topic_path).lower()
         }
         for sensor, params in parameters.items():
@@ -295,6 +294,8 @@ elif reporting_mode == 'homeassistant-mqtt':
             payload['unit_of_measurement'] = params['unit']
             payload['value_template'] = "{{ value_json.%s }}" % (sensor, )
             payload['name'] = "{} {}".format(flora_name, sensor.title())
+            if 'device_class' in params:
+                payload['device_class'] = params['device_class']
             mqtt_client.publish('{}/{}_{}/config'.format(topic_path, flora_name, sensor).lower(), json.dumps(payload), 1, True)
 
 print_line('Initialization complete, starting MQTT publish loop', console=False, sd_notify=True)