feat: implement retry logic and increase connection timeout for kitchen printer network requests

models/pos_printer.py

@@ -10,23 +10,29 @@ def _isolated_printer_thread(ip, data):
     Completely isolated printer thread. 
     Does not touch Odoo environment to avoid GIL/Locking issues.
     """
-    s = None
-    try:
-        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        # 2 seconds is enough for a local network printer. 
-        # Reducing from 5s to avoid holding resources too long.
-        s.settimeout(2.0) 
-        s.connect((ip, 9100))
-        s.sendall(data)
-        _logger.info("POS_PRINTER: Successfully printed to %s", ip)
-    except Exception as e:
-        _logger.error("POS_PRINTER: Background print failed for IP %s: %s", ip, e)
-    finally:
-        if s:
-            try:
-                s.close()
-            except:
-                pass
+    max_retries = 3
+    timeout = 10.0
+    for attempt in range(max_retries):
+        s = None
+        try:
+            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            # Increased timeout to 10s to handle slow networks or waking printers
+            s.settimeout(timeout) 
+            s.connect((ip, 9100))
+            s.sendall(data)
+            _logger.info("POS_PRINTER: Successfully printed to %s (Attempt %d)", ip, attempt + 1)
+            return
+        except Exception as e:
+            if attempt < max_retries - 1:
+                _logger.warning("POS_PRINTER: Print attempt %d failed for IP %s: %s. Retrying...", attempt + 1, ip, e)
+            else:
+                _logger.error("POS_PRINTER: Background print failed for IP %s after %d attempts: %s", ip, max_retries, e)
+        finally:
+            if s:
+                try:
+                    s.close()
+                except:
+                    pass
 
 class PosPrinter(models.Model):
     _inherit = 'pos.printer'
@@ -72,7 +78,7 @@ class PosPrinter(models.Model):
             NEWLINE = b'\n'
 
             data = INIT
-            data += ALIGN_CENTER + SIZE_DOUBLE + BOLD_ON
+            data += ALIGN_CENTER + SIZE_NORMAL + BOLD_ON
             data += b"KITCHEN RECEIPT" + NEWLINE
             data += SIZE_NORMAL + BOLD_OFF + NEWLINE