fix: Reset Bluetooth pairing timer on new pair request

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -19,6 +19,7 @@ from dbus_next import Variant, Message, MessageType
 
 bus = None
 agent_instance = None
+pairing_task = None
 
 # --- Bluetooth constants and agent ---
 BLUEZ_SERVICE = 'org.bluez'
@@ -156,28 +157,37 @@ async def manage_bluetooth():
         await asyncio.sleep(3600)
 
 
+async def enable_pairing():
+    """Enable pairing for 120 seconds. This task can be cancelled and restarted."""
+    adapter_obj = await get_adapter()
+    if not adapter_obj:
+        logging.error('Bluetooth adapter not found')
+        return
+
+    adapter_props = adapter_obj.get_interface('org.freedesktop.DBus.Properties')
+    try:
+        await adapter_props.call_set(ADAPTER_IFACE, 'Discoverable', Variant('b', True))
+        await adapter_props.call_set(ADAPTER_IFACE, 'Pairable', Variant('b', True))
+        logging.info('Adapter is discoverable and pairable for 120 seconds')
+
+        await asyncio.sleep(120)
+
+        logging.info('Pairing timeout reached. Making adapter non-discoverable.')
+        await adapter_props.call_set(ADAPTER_IFACE, 'Discoverable', Variant('b', False))
+    except asyncio.CancelledError:
+        logging.info('Pairing timer cancelled, likely by a new pair request.')
+        raise
+    except Exception as e:
+        logging.error(f"Failed to manage pairing state: {e}")
+
 async def process_bluetooth_command(topic, text):
+    global pairing_task
     logging.info('Bluetooth command: %s', text)
     if text == "pair":
-        logging.info('Starting pairing process by making adapter discoverable')
-        adapter_obj = await get_adapter()
-        if not adapter_obj:
-            logging.error('Bluetooth adapter not found')
-            return
-        
-        adapter_props = adapter_obj.get_interface('org.freedesktop.DBus.Properties')
-
-        try:
-            await adapter_props.call_set(ADAPTER_IFACE, 'Discoverable', Variant('b', True))
-            await adapter_props.call_set(ADAPTER_IFACE, 'Pairable', Variant('b', True))
-            logging.info('Adapter is discoverable and pairable for 120 seconds')
-            
-            await asyncio.sleep(120)
-            
-            await adapter_props.call_set(ADAPTER_IFACE, 'Discoverable', Variant('b', False))
-            logging.info('Adapter is no longer discoverable')
-        except Exception as e:
-            logging.error(f"Failed to set adapter properties: {e}")
+        if pairing_task and not pairing_task.done():
+            logging.info('A pairing process is already active. Cancelling it to restart the timer.')
+            pairing_task.cancel()
+        pairing_task = asyncio.create_task(enable_pairing())
 
 async def process_mqtt(message):
     text = message.payload.decode()