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

src/ATBAPP/ATBDeviceControllerPlugin.cpp

@@ -659,6 +659,7 @@ void ATBDeviceControllerPlugin::requestPrintReceipt(const QString & printingStri
 {
     QByteArray ba = printingString.toUtf8();
     hw->prn_switchPower(true);
+    hw->prn_setFonts(8,12,0,0);
     hw->prn_sendText(&ba);
     QTimer::singleShot(4000, this, SLOT(onPrinterWaitForPrintingReceipt()));
 
@@ -1108,6 +1109,20 @@ void ATBDeviceControllerPlugin::onCashChangerState()
     }
     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!