central_sc_general
功能概述
本示例演示了使能 BLE 中央设备角色，和 central_general 示例不同的是本示例支持加密流程。 在连接建立后，用户可以在控制台下输入相关指令以完成加密流程，如发起配对操作、设置 IO 能力和输入配对码。
配对指令 (cli commands)
- security:
发起配对流程
- auth_method:
设置设备输入输出能力，支持display， display and yes/no， input， no-input-no-output，display and input
- auth_passkey:
给对方设备回复配对码
- auth_cancel:
取消配对流程
- auth_passkey_confirm:
确认配对码正确
- auth_pairing_confirm
确认配对流程
环境要求
支持 BLE 功能的开发板 A，运行本示例
支持 BLE 功能的开发板 B，运行 peripheral_sc_general 示例
编译和烧录
示例位置：examples/bluetooth/central_sc_general
编译、烧录等操作请参考：快速入门
运行结果 (开发板 A)
成功运行将输出如下日志
[I] (84) bt: LE SC enabled
[I] (212) bt: No ID address. App must call settings_load()
[I] (214) bt: Identity: 28:6D:CE:11:22:33 (public)
[I] (214) bt: HCI: version 4.2 (0x08) revision 0x0709, manufacturer 0x070c
[I] (214) bt: LMP: version 4.2 (0x08) subver 0x0709
[I] (227) sc_central: Bluetooth initialized
[I] (229) sc_central: Scanning successfully started
等待开发板 B 烧录 peripheral_sc_general 示例固件
开发板 A 扫描到开发板 B 的特定广播信息后，自动执行连接请求
[I] (18383) sc_central: Device found: 28:6D:CD:68:D7:99 (public) (RSSI -41)
[I] (18400) sc_central: Updated MTU: TX: 23 RX: 23 bytes
[I] (18401) sc_central: Connected: 28:6D:CD:68:D7:99 (public)
连接成功后自动执行配对功能，提示输入配对码
[I] (18902) bt: auth_req:0x0d, init_key:0x05, resp_key:0x07
[I] (19039) sc_central: Remote pairing features: IO: 0x00, OOB: 0, AUTH: 0x0d, Key: 16, Init Kdist: 0x04, Resp Kdist: 0x04
[I] (19040) sc_central: LE conn param req: 28:6D:CD:68:D7:99 (public) int (0x0010, 0x0014) lat 0 to 500
[I] (19189) sc_central: input passkey for 28:6D:CD:68:D7:99 (public)
在开发板 A 的控制台使用
auth_passkey指令输入开发板 B 上显示的配对码 764892
auth_passkey 764892
6. 配对成功后，自动执行更新 MTU 操作，输出如下日志
[W] (36197) bt: chan 0x20004040 conn 0x20003bb8 handle 0 encrypt 0x01 hci status 0x00
[I] (36197) sc_central: Security changed: 28:6D:CD:68:D7:99 (public) level 4
[I] (36197) sc_central: mtu_exchange: Current MTU = 23
[I] (36197) sc_central: mtu_exchange: Exchange MTU...
[I] (36285) sc_central: BONDED with 28:6D:CD:68:D7:99 (public)
[I] (36286) sc_central: Updated MTU: TX: 247 RX: 247 bytes
[I] (36286) sc_central: mtu_exchange_cb: MTU exchange successful (247)
然后，示例程序自动执行查询服务列表和订阅功能，输出如下日志
[I] (6400) central: [ATTRIBUTE] uuid 2803, handle 17
[I] (6401) central: handle 17, prop 0x0a, value_handle 18
[I] (6500) central: [ATTRIBUTE] uuid 2800, handle 16
[I] (6600) central: [ATTRIBUTE] uuid 2803, handle 19
[I] (6700) central: [ATTRIBUTE] uuid 2902, handle 21
[I] (6700) central: [SUBSCRIBED]
订阅成功后，开发板 A 接收到开发板 B 发送的数据，并输出速率信息 ( 本示例数据仅仅用于功能演示 )
[I] (37717) sc_central: rx data rate:240 B/s
[I] (38717) sc_central: rx data rate:4560 B/s
[I] (39768) sc_central: rx data rate:4080 B/s
[I] (40817) sc_central: rx data rate:3840 B/s
[I] (41817) sc_central: rx data rate:4080 B/s
[I] (42818) sc_central: rx data rate:4320 B/s
[I] (43842) sc_central: rx data rate:4080 B/s
备注
本示例需要和 外围安全设备示例 协同工作