fix(label): Encode label to png before sending

.gitignore

@@ -1,6 +1,8 @@
 # Created by https://www.toptal.com/developers/gitignore/api/macos,python,visualstudiocode
 # Edit at https://www.toptal.com/developers/gitignore?templates=macos,python,visualstudiocode
 
+test.png # File generated by test server
+
 ### macOS ###
 # General
 .DS_Store

inventree_phomemo/phomemo_label.py

@@ -62,7 +62,7 @@ class PhomemoLabelPlugin(LabelPrintingMixin, SettingsMixin, InvenTreePlugin):
             print_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
             print_socket.settimeout(5)
             print_socket.connect((ip_address, port))
-            data = label_image
+            data = label_image.tobytes("PNG")
             print_socket.send(data.encode())
             print_socket.close()
         except Exception as error:

inventree_phomemo/server.py

@@ -0,0 +1,23 @@
+# server.py
+# simple listener to an IP port to test the phomemo plugin
+
+import socket
+
+PORT = 9100  # Port to listen on
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.bind(('', PORT))
+s.listen(1)
+while True:
+    conn, addr = s.accept()
+    print(addr)
+    while True:
+        data = conn.recv(9100)
+        print('data received')
+        print('Sending to printer...')
+        
+        printer=open('test.png','wb')
+        printer.write(data)
+        printer.close()
+        if not data:
+            break