Fix nullability

src/HomeAssistantDiscoveryNet/Entities/MqttLawnMowerDiscoveryConfig.cs

@@ -38,6 +38,7 @@ public class MqttLawnMowerDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -79,6 +80,7 @@ public class MqttLawnMowerDiscoveryConfig : MqttDiscoveryConfig
 	///true if no activity_state_topic defined, else false.
 	///</summary> 
 	[JsonPropertyName("optimistic")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Optimistic { get; set; }
 
 	///<summary>
@@ -98,6 +100,7 @@ public class MqttLawnMowerDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
@@ -117,5 +120,6 @@ public class MqttLawnMowerDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 }

src/HomeAssistantDiscoveryNet/Entities/MqttSirenDiscoveryConfig.cs

@@ -39,6 +39,7 @@ public class MqttSirenDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -81,6 +82,7 @@ public class MqttSirenDiscoveryConfig : MqttDiscoveryConfig
 	///true if no state_topic defined, else false.
 	///</summary> 
 	[JsonPropertyName("optimistic")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Optimistic { get; set; }
 
 	///<summary>
@@ -116,13 +118,15 @@ public class MqttSirenDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
 	/// If the published message should have the retain flag on or not.
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 
 	///<summary>
@@ -160,12 +164,14 @@ public class MqttSirenDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("support_duration")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? SupportDuration { get; set; }
 
 	///<summary>
 	/// Set to true if the MQTT siren supports the volume_set service turn on parameter and enables the volume_level state attribute.
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("support_volume_set")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? SupportVolumeSet { get; set; }
 }

src/HomeAssistantDiscoveryNet/Entities/MqttTextDiscoveryConfig.cs

@@ -26,6 +26,7 @@ public class MqttTextDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -59,13 +60,15 @@ public class MqttTextDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 255
 	///</summary> 
 	[JsonPropertyName("max")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Max { get; set; }
 
 	///<summary>
 	/// The minimum size of a text being set or received.
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("min")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Min { get; set; }
 
 	///<summary>
@@ -92,13 +95,15 @@ public class MqttTextDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
 	/// If the published message should have the retain flag on or not.
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 
 	///<summary>

src/HomeAssistantDiscoveryNet/Entities/MqttUpdateDiscoveryConfig.cs

@@ -28,6 +28,7 @@ public class MqttUpdateDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -92,6 +93,7 @@ public class MqttUpdateDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
@@ -111,6 +113,7 @@ public class MqttUpdateDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 
 	///<summary>

src/HomeAssistantDiscoveryNet/Entities/MqttValveDiscoveryConfig.cs

@@ -33,6 +33,7 @@ public class MqttValveDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -74,6 +75,7 @@ public class MqttValveDiscoveryConfig : MqttDiscoveryConfig
 	///false if the state or position topic is defined; true otherwise.
 	///</summary> 
 	[JsonPropertyName("optimistic")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Optimistic { get; set; }
 
 	///<summary>
@@ -115,34 +117,39 @@ public class MqttValveDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("position_closed")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? PositionClosed { get; set; }
 
 	///<summary>
 	/// Number which represents open position. The valve’s position will be scaled to (position_closed…position_open) range when a service is called and scaled back when a value is received.
 	/// , default: 100
 	///</summary> 
 	[JsonPropertyName("position_open")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? PositionOpen { get; set; }
 
 	///<summary>
 	/// The maximum QoS level to be used when receiving and publishing messages.
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
 	/// Set to true if the value reports the position or supports setting the position. Enabling the reports_position option will cause the position to be published instead of a payload defined by payload_open, payload_close or payload_stop. When receiving messages, state_topic will accept numeric payloads or one of the following state messages: open, opening, closed, or closing.
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("reports_position")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? ReportsPosition { get; set; }
 
 	///<summary>
 	/// Defines if published messages should have the retain flag set.
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 
 	///<summary>

src/HomeAssistantDiscoveryNet/Entities/MqttWaterHeaterDiscoveryConfig.cs

@@ -26,6 +26,7 @@ public class MqttWaterHeaterDiscoveryConfig : MqttDiscoveryConfig
 	/// , default: true
 	///</summary> 
 	[JsonPropertyName("enabled_by_default")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? EnabledByDefault { get; set; }
 
 	///<summary>
@@ -46,6 +47,7 @@ public class MqttWaterHeaterDiscoveryConfig : MqttDiscoveryConfig
 	/// Set the initial target temperature. The default value depends on the temperature unit, and will be 43.3°C or 110°F.
 	///</summary> 
 	[JsonPropertyName("initial")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Initial { get; set; }
 
 	///<summary>
@@ -64,12 +66,14 @@ public class MqttWaterHeaterDiscoveryConfig : MqttDiscoveryConfig
 	/// Maximum set point available. The default value depends on the temperature unit, and will be 60°C or 140°F.
 	///</summary> 
 	[JsonPropertyName("max_temp")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public double? MaxTemp { get; set; }
 
 	///<summary>
 	/// Minimum set point available. The default value depends on the temperature unit, and will be 43.3°C or 110°F.
 	///</summary> 
 	[JsonPropertyName("min_temp")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public double? MinTemp { get; set; }
 
 	///<summary>
@@ -118,6 +122,7 @@ public class MqttWaterHeaterDiscoveryConfig : MqttDiscoveryConfig
 	///true if no state topic defined, else false.
 	///</summary> 
 	[JsonPropertyName("optimistic")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Optimistic { get; set; }
 
 	///<summary>
@@ -167,20 +172,23 @@ public class MqttWaterHeaterDiscoveryConfig : MqttDiscoveryConfig
 	///0.1 for Celsius and 1.0 for Fahrenheit.
 	///</summary> 
 	[JsonPropertyName("precision")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public double? Precision { get; set; }
 
 	///<summary>
 	/// The maximum QoS level to be used when receiving and publishing messages.
 	/// , default: 0
 	///</summary> 
 	[JsonPropertyName("qos")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public long? Qos { get; set; }
 
 	///<summary>
 	/// Defines if published messages should have the retain flag set.
 	/// , default: false
 	///</summary> 
 	[JsonPropertyName("retain")]
+	[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
 	public bool? Retain { get; set; }
 
 	///<summary>

src/HomeAssistantDiscoveryNet/MqttDiscoveryJsonContext.cs

@@ -21,6 +21,7 @@ namespace HomeAssistantDiscoveryNet;
 [JsonSerializable(typeof(MqttSceneDiscoveryConfig))]
 [JsonSerializable(typeof(MqttSelectDiscoveryConfig))]
 [JsonSerializable(typeof(MqttSensorDiscoveryConfig))]
+[JsonSerializable(typeof(MqttSirenDiscoveryConfig))]
 [JsonSerializable(typeof(MqttSwitchDiscoveryConfig))]
 [JsonSerializable(typeof(MqttTagScannerDiscoveryConfig))]
 [JsonSerializable(typeof(MqttTemplateLightDiscoveryConfig))]