蓝牙外围设备丢LTK的处理方法_ios15 ble ltk-优快云博客

当使用Nordic蓝牙芯片开发时，如果遇到因丢失长期密钥(LTK)导致的连接加密失败，文章提供了一种处理方法。在PM_CONN_SEC_FAILED事件中，根据错误代码判断情况，若本地设备丢失了绑定信息，则等待重新配对；否则，如iOS设备取消配对，设备将断开连接。

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蓝牙外围设备丢LTK的处理方法

案例使用的Nordic蓝牙芯片进行开发

参考博客园大佬文章

参数说明

 PM_LINK_SECURED_PROCEDURE_ENCRYPTION, /**< @brief Using an LTK that was shared during a previous bonding procedure to encrypt the link. */`在这里插入代码片`
 #define PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING (PM_CONN_SEC_ERROR_BASE + 0x06)  /**< @brief Encryption failed because the peripheral has lost the LTK for this bond. See also @ref BLE_HCI_STATUS_CODE_PIN_OR_KEY_MISSING and Table 3.7 ("Pairing Failed Reason Codes") in the Bluetooth Core Specification 4.2, section 3.H.3.5.5 (@linkBLEcore).  */

事件处理方法


 case PM_EVT_CONN_SEC_FAILED:
         {
            BLEDBG_STR("PM_EVT_CONN_SEC_FAILED\r\n");
            BLEDBG_FMTSTR("peer_id=0x%04x, error=0x%04x\r\n",p_evt->peer_id, p_evt->params.conn_sec_failed.error);
            BLEDBG_FMTSTR("procedure=%d\r\n",p_evt->params.conn_sec_failed.procedure);
             /* Often, when securing fails, it shouldn't be restarted, for security reasons.
              * Other times, it can be restarted directly.
              * Sometimes it can be restarted, but only after changing some Security Parameters.
              * Sometimes, it cannot be restarted until the link is disconnected and reconnected.
              * Sometimes it is impossible, to secure the link, or the peer device does not support it.
              * How to handle this error is highly application dependent. */
            ble_cntrlinfo.flg_commFail = TRUE;  //置上通讯失败标志位
             if ((p_evt->params.conn_sec_failed.procedure == PM_LINK_SECURED_PROCEDURE_ENCRYPTION) && \
                (p_evt->params.conn_sec_failed.error == PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING))
            {// Local device lost bond info, don't disconnect and wait for re-bond
               BLEDBG_STR("Waiting for host to fix bonding\r\n");

            }
            else
            { //IOS手机主动点击了取消配对，设备端需要断开连接，
           	  sprintf(m_message, "Security procedure failed, disconnect.\r\n");   
              dev_ctrl_send_msg(m_message, strlen(m_message));//这里可以增加回复信息给手机
                err_code = sd_ble_gap_disconnect(p_evt->conn_handle,BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
                if ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != BLE_ERROR_INVALID_CONN_HANDLE))
                {
                        APP_ERROR_CHECK(err_code);
                }

            }

           
         } break;