[Freeathome] Some more fixes (openhab#18094)

* Improved debug output and refined comments.

Signed-off-by: Martin Littkovsky [email protected]
Signed-off-by: JankKeks <[email protected]>

Author: JankKeks

bundles/org.openhab.binding.freeathome/src/main/java/org/openhab/binding/freeathome/internal/datamodel/FreeAtHomeDatapoint.java

@@ -87,7 +87,8 @@ DatapointDirection searchForDatapoint(DatapointDirection direction, int neededPa
                 this.channelId = channelId;
                 this.datapointId = datapointId;
 
-                logger.debug("Datapoint is found - channel {} - datapoint {}", this.channelId, this.datapointId);
+                logger.debug("Datapoint is found - channel {} - datapoint {} - pairngId {}", this.channelId,
+                        this.datapointId, neededPairingIDFunction);
 
                 foundId = true;
             }

bundles/org.openhab.binding.freeathome/src/main/java/org/openhab/binding/freeathome/internal/datamodel/FreeAtHomeDatapointGroup.java

@@ -12,10 +12,9 @@
  */
 package org.openhab.binding.freeathome.internal.datamodel;
 
-import static org.openhab.binding.freeathome.internal.datamodel.FreeAtHomeDatapoint.*;
-
 import org.eclipse.jdt.annotation.NonNullByDefault;
 import org.eclipse.jdt.annotation.Nullable;
+import org.openhab.binding.freeathome.internal.datamodel.FreeAtHomeDatapoint.DatapointDirection;
 import org.openhab.binding.freeathome.internal.util.FreeAtHomeGeneralException;
 import org.openhab.binding.freeathome.internal.util.PidTranslationUtils;
 import org.openhab.binding.freeathome.internal.valuestateconverter.BooleanValueStateConverter;
@@ -58,6 +57,10 @@ public enum DatapointGroupDirection {
         outputDatapoint = null;
     }
 
+    public boolean isValid() {
+        return (inputDatapoint != null || outputDatapoint != null);
+    }
+
     boolean addDatapointToGroup(DatapointDirection direction, int neededPairingId, String channelId,
             JsonObject jsonObjectOfChannel) {
         FreeAtHomeDatapoint newDatapoint = new FreeAtHomeDatapoint();