Changer: skip polling, if amount due to change is 0

src/ATBAPP/ATBDeviceControllerPlugin.cpp

@@ -1105,10 +1105,24 @@ void ATBDeviceControllerPlugin::onCashChangerState()
         amountCoinsChangedInt = amountInt - this->cashStartAmountInt;
     }
     else {
-        amountCoinsChangedInt = 0;
+        amountCoinsChangedInt = 0; 
     }
     QString amountCoinsChangedString = QString::number(amountCoinsChangedInt);
 
+    // if we do not need to give change:
+    if (amountCoinsChangedInt == 0) {
+        emit this->cashPaymentFinished(nsDeviceControllerInterface::RESULT_STATE::SUCCESS,
+                                  amountString,
+                                  amountCoinsString,        // coins
+                                  amountNotesString,        // notes
+                                  amountCoinsChangedString, // change
+                                  "",
+                                  "");
+        changerStateRequestCounter = 0;
+        lastChangerResult = 0;
+        return;
+    }
+
 
     // get changer state ------------------------------------------------
     // Note: 'returnedAmount'-parameter is missleading here!