Add darkness parameter to multi printer function

README.md

@@ -82,7 +82,7 @@ in the label section. These values have to fit the label size that is in
 the printer. See the example templates for details on template definition.
 
 ## Multi printer hack
-We had the requirement to print labels in different sizes. As we do not
+We have the requirement to print labels in different sizes. As we do not
 want to change the reel for each print we set up a second printer loaded
 with a different label size. InvenTree is not yet able to handle different
 printers. So I added a multi printer hack. You can define a key with an IP

inventree_zebra/zebra_plugin.py

@@ -83,11 +83,24 @@ def print_label(self, **kwargs):
         interface = self.get_setting('LOCAL_IF')
         port = int(self.get_setting('PORT'))
         threshold = self.get_setting('THRESHOLD')
-        darkness = self.get_setting('DARKNESS')
         dpmm = int(self.get_setting('DPMM'))
         printer_init = self.get_setting('PRINTER_INIT')
         label_image = kwargs['png_file']
 
+        # Select the right printer.
+        # This is a multi printer hack. In case the label has an IP address in the metadata
+        # the address in the settings is overwritten be the metadata. By this you can
+        # specify a separate printer for each label.
+        label = kwargs['label_instance']
+        try:
+            ip_address = label.metadata['ip_address']
+        except Exception:
+            ip_address = self.get_setting('IP_ADDRESS')
+        try:
+            darkness = label.metadata['darkness']
+        except Exception:
+            darkness = self.get_setting('DARKNESS')
+
         # Extract width (x) and height (y) information.
         width = kwargs['width']
         height = kwargs['height']
@@ -113,17 +126,6 @@ def print_label(self, **kwargs):
         # datafile.write(li.dumpZPL())
         # datafile.close()
 
-        # Select the right printer.
-        # This is a multi printer hack. In case the label has an IP address in the metadata
-        # the address in the settings is overwritten be the metadata. By this you can
-        # specify a separate printer for each label.
-
-        label = kwargs['label_instance']
-        try:
-            ip_address = label.metadata['ip_address']
-        except Exception:
-            ip_address = self.get_setting('IP_ADDRESS')
-
         # Send the label to the printer
         if (connection == 'local'):
             try:
@@ -136,6 +138,7 @@ def print_label(self, **kwargs):
         elif (connection == 'network'):
             try:
                 mysocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+                mysocket.settimeout(5)
                 mysocket.connect((ip_address, port))
                 data = li.dumpZPL()
                 mysocket.send(data.encode())