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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _open_tracing_interface(self, conn_id, callback):
 """Enable the debug tracing interface for this IOTile device Args: conn_id (int):
 the unique identifier for the connection callback (callback):
 Callback to be called when this command finishes callback(conn_id, adapter_id, success, failure_reason) """


        try:
            handle = self._find_handle(conn_id)
            services = self._connections[handle]['services']
        except (ValueError, KeyError):
            callback(conn_id, self.id, False, 'Connection closed unexpectedly before we could open the streaming interface')
            return

        self._command_task.async_command(['_enable_tracing', handle, services],
                                         self._on_interface_finished, {'connection_id': conn_id, 'callback': callback})