Hi, Luiz Thanks for your reply. I understand and agree with your opinion. The "start_l2cap" and "l2cap_confirm_event" functions were written according to "start" and "confirm_event". I just keep the parameters passed same with "start" and "confirm_event" functions. I find that "user_data" passed by "start" is also not used in "confirm_event". I think keep same parameters is more unified on the structure. What do you think ? Thanks. Nami ��.n��������+%������w��{.n�����{����^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�