remove HealthSignal from BaseClientActor because it isn't needed anym…

…ore;

Signed-off-by: Stefan Maute <stefan.maute@bosch.io>

connectivity/service/src/main/java/org/eclipse/ditto/connectivity/service/messaging/BaseClientActor.java

@@ -115,7 +115,6 @@
 import org.eclipse.ditto.internal.models.signal.correlation.MatchingValidationResult;
 import org.eclipse.ditto.internal.utils.akka.logging.DittoLoggerFactory;
 import org.eclipse.ditto.internal.utils.akka.logging.ThreadSafeDittoLoggingAdapter;
-import org.eclipse.ditto.internal.utils.cluster.AkkaJacksonCborSerializable;
 import org.eclipse.ditto.internal.utils.config.InstanceIdentifierSupplier;
 import org.eclipse.ditto.internal.utils.config.ScopedConfig;
 import org.eclipse.ditto.internal.utils.metrics.DittoMetrics;
@@ -489,10 +488,6 @@ protected FSMStateFunctionBuilder<BaseClientState, BaseClientData> inAnyState()
                 .event(PublishMappedMessage.class, this::publishMappedMessage)
                 .event(ConnectivityCommand.class, this::onUnknownEvent) // relevant connectivity commands were handled
                 .event(Signal.class, this::handleSignal)
-                .eventEquals(HealthSignal.PING, (ping, data) -> {
-                    sender().tell(HealthSignal.PONG, self());
-                    return stay();
-                })
                 .event(FatalPubSubException.class, this::failConnectionDueToPubSubException);
     }
 
@@ -2253,9 +2248,4 @@ private CloseConnectionAndShutdown() {
         }
     }
 
-    public enum HealthSignal implements AkkaJacksonCborSerializable {
-        PING,
-        PONG
-    }
-
 }