add:支持IOT功能

* 自动注册iot消息为function call函数，并通过function call控制设备

* 增加配置项，控制iot自动注册function call功能的开启

* 增加function call action的 Error code

* update:补充音量太大声、太小声的意图动作

* update：支持IOT功能

---------

Co-authored-by: 玄凤科技 <eric230308@gmail.com>
Co-authored-by: hrz <1710360675@qq.com>

main/xiaozhi-server/core/connection.py

@@ -458,7 +458,7 @@ class ConnectionHandler:
             future = self.executor.submit(self.speak_and_play, text, text_index)
             self.tts_queue.put(future)
             self.dialogue.put(Message(role="assistant", content=text))
-        if result.action == Action.REQLLM: # 调用函数后再请求llm生成回复
+        elif result.action == Action.REQLLM: # 调用函数后再请求llm生成回复
             
             text = result.result
             if text is not None and len(text) > 0:
@@ -473,9 +473,10 @@ class ConnectionHandler:
 
                 self.dialogue.put(Message(role="tool", tool_call_id=function_id, content=text))
                 self.chat_with_function_calling(text, tool_call=True)
-        if result.action == Action.NOTFOUND:
+        elif result.action == Action.NOTFOUND:
+            text = result.response
+        else:
             text = result.response
-
         
 
     def _tts_priority_thread(self):