Print: count undefined print result values and retry

src/ATBAPP/ATBDeviceControllerPlugin.cpp

@@ -654,6 +654,7 @@ void ATBDeviceControllerPlugin::requestPrintReceipt(const QString & printingStri
     hw->prn_switchPower(true);
     hw->prn_setFonts(8,12,0,0);
     hw->prn_sendText(&ba);
+    this->printResultCheckCounter = 0;
     QTimer::singleShot(4000, this, SLOT(onPrinterWaitForPrintingReceipt()));
 
     //QTimer::singleShot(2000, this, [this](){ hw->prn_cut(3);  } );
@@ -844,6 +845,7 @@ void ATBDeviceControllerPlugin::onPrinterDataPrepared()
 
     // note: calling prn_getPrintResult() immediately may result in wrong answer!
     // We have to wait "about some seconds" until calling this function!
+    this->printResultCheckCounter = 0;
     QTimer::singleShot(4000, this, SLOT(onPrinterWaitForPrintingTicket()));
 
     // old: use printer templates:
@@ -867,8 +869,17 @@ void ATBDeviceControllerPlugin::onPrinterWaitForPrintingTicket()
         this->onPrintFinishedERR();
         break;
     default:
-        qCritical() << "DC Error: wait for printing";
-        this->onPrintFinishedERR();
+        // result value is not defined (-> workaround for DC misbehaviour)
+        if (this->printResultCheckCounter < 10) {
+            this->printResultCheckCounter++;
+            qCritical() << "DC print result undefined: " << printerResult;
+            QTimer::singleShot(1000, this, SLOT(onPrinterWaitForPrintingTicket()));
+        }
+        else {
+            qCritical() << "DC Error: wait for printing";
+            this->onPrintFinishedERR();
+        }
+
         break;
     }
 
@@ -896,6 +907,7 @@ void ATBDeviceControllerPlugin::onPrinterPrintNextTemplate()
 
     if (this->currentTicket->templateList()->isEmpty()) {
         // all templates are printed
+        this->printResultCheckCounter = 0;
         QTimer::singleShot(2000, this, SLOT(onPrinterWaitForPrintingTicket()));
     }
     else {

src/ATBAPP/ATBDeviceControllerPlugin.h

@@ -129,6 +129,9 @@ private:
    // counts failed hw->log_chkIfVaultRecordAvailable()
    int accountCheckCounter;
 
+   // counts faild hw->prn-getPrintResult()
+   int printResultCheckCounter;
+
    // dbus
    int init_sc_dbus();