remove defaults for HA Discovery Sensor Object

src/mqtt.h

@@ -401,10 +401,10 @@ DiscoveryObject GenerateButtonDevice(String name, String displayName, String pay
  *
  * @param name The name of the sensor (used in MQTT topics)
  * @param displayName The display name of the sensor (shown in Home Assistant)
- * @param unit_of_measurement The unit of measurement for the sensor data (default: "°C")
+ * @param unit_of_measurement The unit of measurement for the sensor data
  * @return A `DiscoveryObject` containing the sensor device configuration
  */
-DiscoveryObject GenerateSensorDevice(String name, String displayName, String unit_of_measurement = "°C", String device_class = "temperature") {
+DiscoveryObject GenerateSensorDevice(String name, String displayName, String unit_of_measurement, String device_class) {
     String mqtt_topic = String(mqtt_topic_prefix) + String(hostname);
     DiscoveryObject sensor_device;
     String unique_id = "clevercoffee-" + String(hostname);
@@ -517,7 +517,7 @@ int sendHASSIODiscoveryMsg() {
     DiscoveryObject brewtime = GenerateNumberDevice("brewtime", "Brew time", BREW_TIME_MIN, BREW_TIME_MAX, 0.1, "s");
 
     // Sensor Devices
-    DiscoveryObject actual_temperature = GenerateSensorDevice("temperature", "Boiler Temperature");
+    DiscoveryObject actual_temperature = GenerateSensorDevice("temperature", "Boiler Temperature", "°C", "temperature");
     DiscoveryObject heaterPower = GenerateSensorDevice("heaterPower", "Heater Power", "%", "power_factor");
     DiscoveryObject machineStateDevice = GenerateSensorDevice("machineState", "Machine State", "", "enum");
     DiscoveryObject currentWeight = GenerateSensorDevice("currentWeight", "Weight", "g", "weight");