J-N-K
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diff --git a/‎README.md‎
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diff --git a/‎pom.xml‎
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diff --git a/‎src/main/java/io/github/hapjava/accessories/FilterMaintenanceAccessory.java‎
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diff --git a/‎src/main/java/io/github/hapjava/accessories/HeaterCoolerAccessory.java‎
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diff --git a/‎src/main/java/io/github/hapjava/accessories/HumidifierDehumidifierAccessory.java‎
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diff --git a/‎src/main/java/io/github/hapjava/accessories/ThermostatAccessory.java‎
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@@ -7,6 +7,13 @@
     * `services` package consists of services, which grouping characteristics. e.g. `WindowCoveringService` defines mandatory and optional characteristics for a window covering service as it is defined in HAP spec.
     * `server` package consists classes to run HomeKit server and handle communication
 * the process is following: client, e.g. openHAB bindings, extends accessory classes, e.g. `WindowCoveringAccessory` and implements all required methods. WindowCoveringAccessory is linked already to WindowCoveringService, that in turn is link to single characteristics. 
+* linked service support
+
+## New and improved
+
+* Valid values are supported for enum characteristics instead of min and max values
+* Supported valid states for Thermostat, SecuritySystem, HeaterCooler and HumidifierDehumidifier [#108] [#120](https://github.com/hap-java/HAP-Java/pull/120)
+* Support for FilterMaintenance. Can be used as a linked service for an Air Purifier  [#124](https://github.com/hap-java/HAP-Java/pull/124)
 
 # HAP-Java 1.1.5
 
@@ -21,6 +28,7 @@
 * Fix various spec violations and optimize communications to improve performance [#65](https://github.com/hap-java/HAP-Java/pull/65)
 * Fix a pairing issue in which HAP-Java could listen on a different interface than that which it advertises [#67](https://github.com/hap-java/HAP-Java/pull/67)
 * Allow window covering to be used without optional characteristics. The inclusion of `HoldPositionCharacteristic` did terrible things, and we're still not sure why. Addressed [#56](https://github.com/hap-java/HAP-Java/pull/56)
+* Air Purifier didn't support rotation speed characteristics. [#124](https://github.com/hap-java/HAP-Java/pull/124)
 
 ## New and improved
 
 
@@ -23,7 +23,7 @@ After that, check out the [Sample](https://github.com/hap-java/HAP-Java/tree/sam
 Supported HomeKit Accessories
 =========
 
-Current implementation fully supports 37 HomeKit accessory/services.
+Current implementation fully supports 38 HomeKit accessory/services.
 
 | HomeKit Accessory & Service type | Supported by Java-HAP |
 |--------------------|--------------------|
@@ -41,7 +41,7 @@ Current implementation fully supports 37 HomeKit accessory/services.
 |  Doorbell                         |     :white_check_mark:    |
 |  Fan                              |     :white_check_mark:    |
 |  Faucet                           |     :white_check_mark:    |
-|  Filter Maintenance               |     :x:                   |
+|  Filter Maintenance               |     :white_check_mark:    |
 |  Garage Door Opener               |     :white_check_mark:    |
 |  HAP Protocol Information         |     :white_check_mark:    |
 |  Heater Cooler                    |     :white_check_mark:    |
 
@@ -134,9 +134,9 @@
 		</dependency>
 
 		<dependency>
-			<groupId>javax.jmdns</groupId>
+			<groupId>org.jmdns</groupId>
 			<artifactId>jmdns</artifactId>
-			<version>3.4.1</version>
+			<version>3.5.6</version>
 		</dependency>
 
 		<dependency>
 
@@ -0,0 +1,40 @@
+package io.github.hapjava.accessories;
+
+import io.github.hapjava.characteristics.HomekitCharacteristicChangeCallback;
+import io.github.hapjava.characteristics.impl.filtermaintenance.FilterChangeIndicationEnum;
+import io.github.hapjava.services.Service;
+import io.github.hapjava.services.impl.FilterMaintenanceService;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * A Filter maintenance with mandatory characteristics.
+ *
+ * <p>The HomeKit app doesn't support a separate FilterMaintenance, but as a linked service to
+ * AirPurifier.
+ */
+public interface FilterMaintenanceAccessory extends HomekitAccessory {
+
+  /**
+   * The filter change indictaion. It's either yes or no.
+   *
+   * @return FilterChangeIndicationEnum
+   */
+  CompletableFuture<FilterChangeIndicationEnum> getFilterChangeIndication();
+
+  /**
+   * Subscribes to changes in the filter change indication.
+   *
+   * @param callback the function to call when the state changes.
+   */
+  void subscribeFilterChangeIndication(HomekitCharacteristicChangeCallback callback);
+
+  /** Unsubscribes from changes in the filter change indication. */
+  void unsubscribeFilterChangeIndication();
+
+  @Override
+  default Collection<Service> getServices() {
+    return Collections.singleton(new FilterMaintenanceService(this));
+  }
+}
@@ -96,6 +96,24 @@ public interface HeaterCoolerAccessory extends HomekitAccessory {
   /** Unsubscribes from changes in the current temperature. */
   void unsubscribeCurrentTemperature();
 
+  /**
+   * Valid values for current state.
+   *
+   * @return array of valid current states
+   */
+  default CurrentHeaterCoolerStateEnum[] getCurrentHeaterCoolerStateValidValues() {
+    return CurrentHeaterCoolerStateEnum.values();
+  }
+
+  /**
+   * Valid values for target state.
+   *
+   * @return array of valid target states
+   */
+  default TargetHeaterCoolerStateEnum[] getTargetHeaterCoolerStateValidValues() {
+    return TargetHeaterCoolerStateEnum.values();
+  }
+
   @Override
   default Collection<Service> getServices() {
     return Collections.singleton(new HeaterCoolerService(this));
 
@@ -57,6 +57,16 @@ public interface HumidifierDehumidifierAccessory extends HomekitAccessory {
   CompletableFuture<Void> setTargetHumidifierDehumidifierState(
       TargetHumidifierDehumidifierStateEnum state);
 
+  /**
+   * Valid values for target state.
+   *
+   * @return array of valid target states.
+   */
+  default TargetHumidifierDehumidifierStateEnum[]
+      getTargetHumidifierDehumidifierStateValidValues() {
+    return TargetHumidifierDehumidifierStateEnum.values();
+  }
+
   /**
    * Subscribes to changes in the humidifier/dehumidifier current state.
    *
 
@@ -64,6 +64,24 @@ public interface SecuritySystemAccessory extends HomekitAccessory {
    */
   void unsubscribeTargetSecuritySystemState();
 
+  /**
+   * Valid values for current state.
+   *
+   * @return array of valid current states.
+   */
+  default CurrentSecuritySystemStateEnum[] getCurrentSecuritySystemStateValidValues() {
+    return CurrentSecuritySystemStateEnum.values();
+  }
+
+  /**
+   * Valid values for target state.
+   *
+   * @return array of valid targe states.
+   */
+  default TargetSecuritySystemStateEnum[] getTargetSecuritySystemStateValidValues() {
+    return TargetSecuritySystemStateEnum.values();
+  }
+
   @Override
   default Collection<Service> getServices() {
     return Collections.singleton(new SecuritySystemService(this));
 
@@ -189,6 +189,24 @@ default double getMinStepTargetTemperature() {
   /** Unsubscribes from changes in the target temperature. */
   void unsubscribeTargetTemperature();
 
+  /**
+   * Valid values for current state.
+   *
+   * @return array of valid current states.
+   */
+  default CurrentHeatingCoolingStateEnum[] getCurrentHeatingCoolingStateValidValues() {
+    return CurrentHeatingCoolingStateEnum.values();
+  }
+
+  /**
+   * Valid values for target state.
+   *
+   * @return array of valid targe states.
+   */
+  default TargetHeatingCoolingStateEnum[] getTargetHeatingCoolingStateValidValues() {
+    return TargetHeatingCoolingStateEnum.values();
+  }
+
   @Override
   default Collection<Service> getServices() {
     return Collections.singleton(new ThermostatService(this));
 
@@ -0,0 +1,25 @@
+package io.github.hapjava.accessories.optionalcharacteristic;
+
+import io.github.hapjava.characteristics.HomekitCharacteristicChangeCallback;
+import java.util.concurrent.CompletableFuture;
+
+/** Accessory with filter level characteristics */
+public interface AccessoryWithFilterLifeLevel {
+
+  /**
+   * what's the filter life level, percentage wise
+   *
+   * @return filter life level
+   */
+  CompletableFuture<Double> getFilterLifeLevel();
+
+  /**
+   * Subscribes to changes in the filter life level.
+   *
+   * @param callback the function to call when the level changes.
+   */
+  void subscribeFilterLifeLevel(HomekitCharacteristicChangeCallback callback);
+
+  /** Unsubscribes from changes in the current filter life level. */
+  void unsubscribeFilterLifeLevel();
+}
@@ -0,0 +1,16 @@
+package io.github.hapjava.accessories.optionalcharacteristic;
+
+import java.util.concurrent.CompletableFuture;
+
+/** Accessory with filter reset characteristics */
+public interface AccessoryWithResetFilterIndication {
+
+  /**
+   * Request to reset the filter level
+   *
+   * @param indication always 1, by HomeKit protocol. (to be ignored)
+   * @return a future that completes when the change is made
+   * @throws Exception when the change cannot be made
+   */
+  CompletableFuture<Void> resetFilterIndication(Integer indication) throws Exception;
+}