diff --git a/LICENSE b/LICENSE
index df34e5e..3669087 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016-2023 Jon Caruana
+Copyright (c) 2016-2024 Jon Caruana
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/mock_mcp.py b/mock_mcp.py
index a34da31..bb0032b 100644
--- a/mock_mcp.py
+++ b/mock_mcp.py
@@ -1,14 +1,29 @@
 import logging
-from enum import Enum
+from enum import Flag, auto
 
 _LOGGER = logging.getLogger(__name__)
 
-class MockSystem(Enum):
-    LITEJET = 1
-    LITEJET_48 = 2
+class MockSystem(Flag):
+    # Models (choose one)
+    MODEL_LITEJET = auto()
+
+    # Quirks (choose zero or more)
+    QUIRK_DUAL = auto()
+    QUIRK_OLD_LOAD_EVENT = auto()
+
+    # Standard combinations
+    LITEJET = MODEL_LITEJET
+    LITEJET_48 = MODEL_LITEJET | QUIRK_DUAL
+    LITEJET_OLD = MODEL_LITEJET | QUIRK_OLD_LOAD_EVENT
+
+    def is_dual(self):
+        return MockSystem.QUIRK_DUAL in self
+    def old_load_event(self):
+        return MockSystem.QUIRK_OLD_LOAD_EVENT in self
 
 class MockMCP:
     def __init__(self, system: MockSystem = MockSystem.LITEJET):
+        _LOGGER.info(f"System: {system}")
         self._system = system
         self._load_levels = {}
         self._switch_pressed = {}
@@ -16,9 +31,9 @@ def __init__(self, system: MockSystem = MockSystem.LITEJET):
         self._other = None
         self._prefix = ""
 
-        if system == MockSystem.LITEJET_48:
+        if system.is_dual():
             self._prefix = "Alpha "
-            self._other = MockMCP(MockSystem.LITEJET)
+            self._other = MockMCP(system & ~MockSystem.QUIRK_DUAL)
             self._other._prefix = "Bravo "
             self._other._other = self
 
@@ -37,8 +52,13 @@ def add_listener(self, r):
 
     def set_load(self, number: int, level: int):
         self._load_levels[number] = level
-        self._broadcast(f"^K{number:03d}{level:02d}\r")
-        self._broadcast_other(f"^K{number+40:03d}{level:02d}\r")
+        if self._system.old_load_event():
+            event = "F" if level == 0 else "N"
+            self._broadcast(f"{event}{number:03d}\r")
+            self._broadcast_other(f"{event}{number+40:03d}\r")
+        else:
+            self._broadcast(f"^K{number:03d}{level:02d}\r")
+            self._broadcast_other(f"^K{number+40:03d}{level:02d}\r")
 
     def set_switch(self, number: int, pressed: bool):
         if self._switch_pressed.get(number, False) == pressed:
diff --git a/mock_server.py b/mock_server.py
index 3f57195..b52616f 100644
--- a/mock_server.py
+++ b/mock_server.py
@@ -47,10 +47,15 @@ async def run_server():
 parser.add_argument(
     "--litejet48",
     help="Emulate a LiteJet 48 (two LiteJet boards)",
-    action="store_true"
+    action="store_const", dest="system", const=MockSystem.LITEJET_48
+)
+parser.add_argument(
+    "--oldlitejet",
+    help="Emulate an old LiteJet (sends load on/off event only)",
+    action="store_const", dest="system", const=MockSystem.LITEJET_OLD
 )
 args = parser.parse_args()
 
-mcp = MockMCP(MockSystem.LITEJET_48 if args.litejet48 else MockSystem.LITEJET)
+mcp = MockMCP(args.system or MockSystem.LITEJET)
 
 asyncio.run(run_server())
diff --git a/pylitejet/__init__.py b/pylitejet/__init__.py
index 35f68ba..b633005 100644
--- a/pylitejet/__init__.py
+++ b/pylitejet/__init__.py
@@ -268,25 +268,32 @@ async def _reader_impl(self):
         while self._reader_active:
             try:
                 line = await self._adapter.read()
-            except:
+            except Exception as exc:
+                _LOGGER.debug(f"Read error: {exc}")
                 await asyncio.sleep(5)
                 continue
 
-            line = line[0:-1].decode("utf-8")
-
-            _LOGGER.debug(f'Read "{line}" ({len(line)})')
-            if len(line) == 4 and (line[0] == "P" or line[0] == "R"):
-                self._notify_event(line)
-            elif len(line) == 4 and (line[0] == "F" or line[0] == "N"):
-                self._notify_event(line)
-            elif len(line) == 7 and line[0] == "^" and line[1] == "K":
-                new_level = line[5:7]
-                _LOGGER.debug("Dim event: '" + line[2:5] + "' '" + new_level + "'")
-                event_name = "F" if new_level == "00" else "N"
-                self._notify_event(event_name + line[2:5], int(new_level))
-            else:
-                self._recv_line = line
-                self._recv_event.set()
+            try:
+                line = line[0:-1].decode("utf-8")
+
+                _LOGGER.debug(f'Read "{line}" ({len(line)})')
+                if len(line) == 4 and (line[0] == "P" or line[0] == "R"):
+                    # Switch press/release event
+                    self._notify_event(line)
+                elif len(line) == 4 and (line[0] == "F" or line[0] == "N"):
+                    # Load on/off event
+                    self._notify_event(line, None)
+                elif len(line) == 7 and line[0] == "^" and line[1] == "K":
+                    # Dimming event
+                    new_level = line[5:7]
+                    event_name = "F" if new_level == "00" else "N"
+                    self._notify_event(event_name + line[2:5], int(new_level))
+                else:
+                    # Possible command response
+                    self._recv_line = line
+                    self._recv_event.set()
+            except Exception as exc:
+                _LOGGER.error(f"While handling '{line}': {exc}")
 
     async def close(self):
         self._open = False