[epsonprojector] Update powerstate when Thing is offline (#20474)

* Update powerstate when Thing is offline

Signed-off-by: Michael Lobstein <michael.lobstein@gmail.com>

bundles/org.openhab.binding.epsonprojector/src/main/java/org/openhab/binding/epsonprojector/internal/enums/PowerStatus.java

@@ -26,6 +26,7 @@ import org.eclipse.jdt.annotation.NonNullByDefault;
  */
 @NonNullByDefault
 public enum PowerStatus {
+    OFFLINE(-1),
     STANDBY(0x00),
     ON(0x01),
     WARMUP(0x02),

bundles/org.openhab.binding.epsonprojector/src/main/java/org/openhab/binding/epsonprojector/internal/handler/EpsonProjectorHandler.java

@@ -450,7 +450,12 @@ public class EpsonProjectorHandler extends BaseThingHandler {
             try {
                 logger.debug("Closing connection to device '{}'", this.thing.getUID());
                 device.get().disconnect();
+                isPowerOn = false;
+
                 updateStatus(ThingStatus.OFFLINE);
+                if (isLinked(CHANNEL_TYPE_POWERSTATE)) {
+                    updateState(CHANNEL_TYPE_POWERSTATE, new StringType(PowerStatus.OFFLINE.toString()));
+                }
             } catch (EpsonProjectorException e) {
                 logger.debug("Error occurred when closing connection to device '{}'", this.thing.getUID(), e);
             }