[FIX] printer_zpl2: QR as bytes

printer_zpl2/models/printing_label_zpl2.py

@@ -199,7 +199,7 @@ class PrintingLabelZpl2(models.Model):
             else:
                 if component.component_type == zpl2.BARCODE_QR_CODE:
                     # Adding Control Arguments to QRCode data Label
-                    data = 'MM,A{}'.format(data)
+                    data = '{}A,{}'.format(component.error_correction, data)
 
                 barcode_arguments = dict([
                     (field_name, component[field_name])

printer_zpl2/tests/test_printing_label_zpl2.py

@@ -1002,7 +1002,7 @@ class TestPrintingLabelZpl2(TransactionCase):
             # Component format
             '^BQN,2,1,Q,7'
             # Component contents
-            '^FDMM,A{contents}'
+            '^FDQA,{contents}'
             # Component end
             '^FS\n'
             # Recall last saved parameters