feat(printer): Add basic printer plugin implementation

inventree_phomemo/phomemo_plugin.py

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+# translation
+from django.utils.translation import gettext_lazy as _
+from django.core.validators import MinValueValidator
+from django.core.validators import MaxValueValidator
+
+# printer supportt
+import socket
+
+# InvenTree plugin libs
+from plugin import InvenTreePlugin
+from plugin.mixins import LabelPrintingMixin, SettingsMixin
+
+from inventree_phomemo.version import PHOMEMO_PLUGIN_VERSION
+
+class PhomemoLabelPlugin(LabelPrintingMixin, SettingsMixin, InvenTreePlugin):
+    AUTHOR = "Sergal.engineering"
+    DESCRIPTION = "Label printing plugin for Phomemo printers"
+    VERSION = PHOMEMO_PLUGIN_VERSION
+    NAME = "Phomemo"
+    SLUG = "phomemo"
+    TITLE = "Phomemo Label Printer"
+
+    SETTINGS = {
+        'IP_ADDRESS': {
+            'name': _('IP Address'),
+            'description': _('IP address of phomemo print server'),
+            'default': '',
+        },
+        'PORT': {
+            'name': _('Port'),
+            'description': _('Port of phomemo print server'),
+            'default': '9100',
+        },
+        'THRESHOLD': {
+            'name': _('Threshold'),
+            'description': _('Threshold for B/W conversion (0-255)'),
+            'validator': [int, MinValueValidator(0), MaxValueValidator(255)],
+            'default': 200,
+        },
+    }
+
+    def print_label(self, **kwargs):
+
+        # Read settings
+        ip_address = self.get_setting('IP_ADDRESS')
+        port = int(self.get_setting('PORT'))
+        threshold = self.get_setting('THRESHOLD')
+        label_image = kwargs['png_file']
+
+        # Extract width (x) and height (y) information.
+        width = kwargs['width']
+        height = kwargs['height']
+
+        # convert image to B/W
+        fn = lambda x: 255 if x > threshold else 0
+        label_image = label_image.convert('L').point(fn, mode='1')
+
+        ##### Convert to phomemo
+
+        # Send the label to the printer
+        try:
+            print_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            print_socket.settimeout(5)
+            print_socket.connect((ip_address, port))
+            data = label_image
+            print_socket.send(data.encode())
+            print_socket.close()
+        except Exception as error:
+            raise ConnectionError('Error connecting to printer server: ' + str(error))

inventree_phomemo/version.py

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+PHOMEMO_PLUGIN_VERSION = "0.0.0"