esp32 ble蓝牙静态链接密码为什么没用？esp_ ble gap_ set security_ param()函数为什么调用多次？

Question

12: uint8 t key_size = 16; //the key-size should be 7~16 bytes
513: uint8_t init_key = ESP BLE_ENC_ KEY MASK:| ESP_ BLE_ID_ KEY_MASK;
514: uint8_t rsp_key = ESP_BLE_ENC_ KEY_MASK | ESP BLE_ID_KEY_MASK;
515: //set static passkey
516: ** uint32 t passkey = 123456;**
517: uint8_t auth_option:= ESP_BLE_ONLY_ACCEPT_SPECIFIED_ AUTH_DISABLE;
518: uint8_t oob_support = ESP_BLE_OOB_DISABLE;
519 esp ble gap set security_ param(ESP BLE_SM_SET STATIC_ PASSKEY, &passkey, sizeof(uint32_t));
520: esp_ ble gap_ set security_ param(ESP BLE_ SM_AUTHEN REQ_MODE, &auth_req, sizeof(uint8_t)); //ble gap_sel- ecu
521: esp ble gap set security r param(ESP nam(eSP BLE SM IOCAP_MODE, &iocap, sizeof(uint8_t)),
522: esp ble gap set security param(ESP BLE_SM_MAX_ KEY_ SIZE, &key_size, sizeof(uint8_t));
523: esp ble gap set security_ param(ESP BLE SM ONLY ACCEPT SPECIFIED SEC_ AUTH, &auth_option, sizeof(uint8_t))
524: esp ble gap set_ security param(ESP BLE SM OOB SUPPORT, &oob_ support, sizeof(uint8_t));

525: /* If your BLE device-acts-as •a Slave, the-init_ key means-you-hope which-types of key-of the master shoul
526: and-the response key-means which key you-can-distribute to the-master;
527: If-your BLE device acts as a master, the response key-means you-hope which-types of key-of the slave show
528: and-the init key-means which-key-you-can-distribute to-the slave */

529: esp ble gap set security param(ESP BLE SM_SET_ INIT_KEY, &init_key, sizeof(uint8_t));
530: esp ble_gap_set security_param (ESP_BLE_SM_SET_ RSP_KEY, &rsp_ key, sizeof(uint8_t));

Answer 1

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在ESP32中使用静态链接密码时，调用esp_ble_gap_set_security_param函数多次是为了设置不同的安全参数。每次调用该函数可以设置不同的安全参数，以满足不同的需求。

在给出的代码中，第519行到第524行的esp_ble_gap_set_security_param函数的调用分别设置了以下安全参数：

• ESP_BLE_SM_SET_STATIC_PASSKEY：设置静态passkey（密码）
• ESP_BLE_SM_AUTHEN_REQ_MODE：设置认证模式
• ESP_BLE_SM_IOCAP_MODE：设置输入输出能力
• ESP_BLE_SM_MAX_KEY_SIZE：设置最大密钥大小
• ESP_BLE_SM_ONLY_ACCEPT_SPECIFIED_SEC_AUTH：设置仅接受指定的安全认证

第529行和第530行的esp_ble_gap_set_security_param函数调用是为了设置初始密钥和响应密钥。根据注释，如果BLE设备作为从设备（Slave）时，初始密钥表示希望从设备分发给主设备的密钥类型，响应密钥表示可以分发给主设备的密钥类型。如果BLE设备作为主设备（Master）时，响应密钥表示希望从设备展示的密钥类型，初始密钥表示可以分发给从设备的密钥类型。

因此，通过多次调用esp_ble_gap_set_security_param函数，可以设置不同的安全参数和密钥类型，以满足具体的使用场景和需求。