diff --git a/src/meshcore/ble_cx.py b/src/meshcore/ble_cx.py
index 517ef1b..d0aa14d 100644
--- a/src/meshcore/ble_cx.py
+++ b/src/meshcore/ble_cx.py
@@ -49,7 +49,8 @@ class BLEConnection:
         if self.client:
             logger.debug("Using pre-configured BleakClient.")
             # If a client is already provided, ensure its disconnect callback is set
-            self.client._disconnected_callback = self.handle_disconnect
+            assert isinstance(self.client, BleakClient)
+            self.client.set_disconnected_callback(self.handle_disconnect)
             self.address = self.client.address
         else:
 
diff --git a/src/meshcore/events.py b/src/meshcore/events.py
index fc81f80..001992d 100644
--- a/src/meshcore/events.py
+++ b/src/meshcore/events.py
@@ -1,4 +1,5 @@
 from enum import Enum
+import inspect
 import logging
 from math import log
 from typing import Any, Dict, Optional, Callable, List, Union
@@ -133,6 +134,7 @@ class EventDispatcher:
         while self.running:
             event = await self.queue.get()
             logger.debug(f"Dispatching event: {event.type}, {event.payload}, {event.attributes}")
+            
             for subscription in self.subscriptions.copy():
                 # Check if event type matches
                 if subscription.event_type is None or subscription.event_type == event.type:
@@ -142,14 +144,23 @@ class EventDispatcher:
                         if not all(event.attributes.get(key) == value 
                                 for key, value in subscription.attribute_filters.items()):
                             continue
-                    try:
-                        result = subscription.callback(event.clone())
-                        if asyncio.iscoroutine(result):
-                            await result
-                    except Exception as e:
-                        print(f"Error in event handler: {e}")
+                    
+                    # Fire the call back asychronously
+                    asyncio.create_task(self._execute_callback(subscription.callback, event.clone()))
                         
             self.queue.task_done()
+
+    async def _execute_callback(self, callback, event):
+        """Execute a callback with proper error handling"""
+        try:
+            if asyncio.iscoroutinefunction(callback):
+                await callback(event)
+            else:
+                result = callback(event)
+                if inspect.iscoroutine(result):
+                    await result
+        except Exception as e:
+            logger.error(f"Error in event handler for {event.type}: {e}", exc_info=True)
             
     async def start(self):
         if not self.running:
diff --git a/src/meshcore/serial_cx.py b/src/meshcore/serial_cx.py
index 172baf4..45c0034 100644
--- a/src/meshcore/serial_cx.py
+++ b/src/meshcore/serial_cx.py
@@ -20,6 +20,7 @@ class SerialConnection:
         self.inframe = b""
         self._disconnect_callback = None
         self.cx_dly = cx_dly
+        self._connected_event = asyncio.Event()
 
     class MCSerialClientProtocol(asyncio.Protocol):
         def __init__(self, cx):
@@ -30,12 +31,14 @@ class SerialConnection:
             logger.debug('port opened')
             if isinstance(transport, serial_asyncio.SerialTransport) and transport.serial:
                 transport.serial.rts = False  # You can manipulate Serial object via transport
+            self.cx._connected_event.set()
     
         def data_received(self, data):
             self.cx.handle_rx(data)    
     
         def connection_lost(self, exc):
             logger.debug('Serial port closed')
+            self.cx._connected_event.clear()
             if self.cx._disconnect_callback:
                 asyncio.create_task(self.cx._disconnect_callback("serial_disconnect"))
     
@@ -49,12 +52,14 @@ class SerialConnection:
         """
         Connects to the device
         """
+        self._connected_event.clear()
+        
         loop = asyncio.get_running_loop()
         await serial_asyncio.create_serial_connection(
                 loop, lambda: self.MCSerialClientProtocol(self), 
                 self.port, baudrate=self.baudrate)
 
-        await asyncio.sleep(self.cx_dly) # wait for cx to establish
+        await self._connected_event.wait()
         logger.info("Serial Connection started")
         return self.port
 
@@ -99,6 +104,7 @@ class SerialConnection:
         if self.transport:
             self.transport.close()
             self.transport = None
+            self._connected_event.clear()
             logger.debug("Serial Connection closed")
             
     def set_disconnect_callback(self, callback):
diff --git a/tests/test_ble_connection.py b/tests/test_ble_connection.py
index dc2a649..d15e9f7 100644
--- a/tests/test_ble_connection.py
+++ b/tests/test_ble_connection.py
@@ -44,6 +44,7 @@ class TestBLEConnection(unittest.TestCase):
         asyncio.run(ble_conn.send(data_to_send))
 
         # Assert
+        assert(isinstance(ble_conn.rx_char, MagicMock))
         ble_conn.rx_char.write_gatt_char.assert_called_once_with(ble_conn.rx_char, data_to_send, response=True)
 
     def _get_mock_bleak_client(self):