+int sttd_engine_agent_recognize_cancel();
+
+/** Send engine's information */
+int sttd_engine_agent_send_result(stte_result_event_e event, const char* type, const char** result, int result_count,
+ const char* msg, void* time_info, void *user_data);
+
+int sttd_engine_agent_send_error(stte_error_e error, const char* msg);
+
+int sttd_engine_agent_send_speech_status(stte_speech_status_e status, void* user_data);