now responds too a message

main.py

@@ -28,7 +28,8 @@ async def message_callback(room: MatrixRoom, event: RoomMessageText):
     logger.debug("Message callback triggered")
     if event.sender == USER_ID:
         return
-
+    
+    body = event.body.strip().lower()
     logger.info("Message from %s in %s: %s", event.sender, room.display_name, event.body)
 
     if event.body.strip().lower() == "!ping":
@@ -38,13 +39,27 @@ async def message_callback(room: MatrixRoom, event: RoomMessageText):
             content={"msgtype": "m.text", "body": "Pong!"}
         )
         logger.info("Replied with Pong! to %s", event.sender)
+    elif body== "hello botbot":
+        await client.room_send(
+            room_id=room.room_id,
+            message_type="m.room.message",
+            content={
+                "msgtype": "m.text", 
+                "body": "Hello! How can I assist you today?",                
+            },
+            ignore_unverified_devices=True
+        )
+        logger.info("Replied with greeting to %s", event.sender)
 
 async def main():
     global client
     logger.debug(HOMESERVER_URL)
     logger.debug(USER_ID)
     # Configure client with persistent store
-    config = AsyncClientConfig(store_sync_tokens=True)
+    config = AsyncClientConfig(
+        store_sync_tokens=True,
+        encryption_enabled=True,
+    )
     client = AsyncClient(
         HOMESERVER_URL,
         USER_ID,