<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def trace(self, data, callback=None):
 """Queue data for tracing Args: data (bytearray, string):
 Unstructured data to trace to any connected client. callback (callable):
 An optional callback that will be called with a bool value of True when this data actually gets traced. If the client disconnects and the data is dropped instead, callback will be called with False. """


        conn_id = self._find_connection(self.conn_string)

        if conn_id is not None:
            self.adapter.notify_event_nowait(self.conn_string, 'trace', data)

        if callback is not None:
            callback(conn_id is not None)