http://www.deyisupport.com/question_answer/wireless_connectivity/bluetooth/f/103/t/62156.aspx

#define GAPBOND_IO_CAP_DISPLAY_ONLY 0x00 //!< Display Only Device

#define GAPBOND_IO_CAP_DISPLAY_YES_NO 0x01 //!< Display and Yes and No Capable

#define GAPBOND_IO_CAP_KEYBOARD_ONLY 0x02 //!< Keyboard Only

#define GAPBOND_IO_CAP_NO_INPUT_NO_OUTPUT 0x03 //!< No Display or Input Device

#define GAPBOND_IO_CAP_KEYBOARD_DISPLAY 0x04 //!< Both Keyboard and Display Capable

#define GAPBOND_IO_CAP_DISPLAY_ONLY 0x00 //!< Display Only Device

本机仅是显示设备，本机显示密码，对端输入密码

#define GAPBOND_IO_CAP_DISPLAY_YES_NO 0x01 //!< Display and Yes and No Capable

本机显示密码，对端输入密码后，还需要本机确认是否配对

#define GAPBOND_IO_CAP_KEYBOARD_ONLY 0x02 //!< Keyboard Only

对端显示密码，本机输入密码

#define GAPBOND_IO_CAP_NO_INPUT_NO_OUTPUT 0x03 //!< No Display or Input Device

本机即不能显示密码也不能输入密码，对端只需要确定是否配对

#define GAPBOND_IO_CAP_KEYBOARD_DISPLAY 0x04 //!< Both Keyboard and Display Capable

是否是双方都要输入对方显示的密码？