AT消息
=================

从 BK7238 命令端口返回的消息有两种类型：被动响应和主动报告。

-------------------
BK7238被动响应
-------------------

每个输入每条命令都会返回响应，告诉发送者命令的执行结果。

+---------------------+------------------------------------+
|AT被动响应           |说明                                |
+=====================+====================================+
|OK                   |AT 命令处理完毕，返回 OK            |
+---------------------+------------------------------------+
|ERROR                |AT 命令错误或执行过程中发生错误     |
+---------------------+------------------------------------+
|SEND OK              |数据已发送到协议栈                  |
+---------------------+------------------------------------+
|SEND FAIL            |向协议栈发送数据时发生错误          |
+---------------------+------------------------------------+
|+<Command Name>:...  |详细描述 AT 命令处理结果            |
+---------------------+------------------------------------+

-------------------
BK7238主动报告
-------------------

BK7238在执行过程中会报告系统中重要的状态变化或消息。

+-------------------------------------------+----------------------------------------------------------+
|AT消息报告                                 |说明                                                      |
+===========================================+==========================================================+
|ready                                      |上电初始化完成AT指令已经准备就绪                          |
+-------------------------------------------+----------------------------------------------------------+
|bk_reboot                                  |立即重启模块                                              |
+-------------------------------------------+----------------------------------------------------------+
|WIFI CONNECTED                             |Wi-Fi station 接口已连接到 AP                             |
+-------------------------------------------+----------------------------------------------------------+
|WIFI GOT IP                                |Wi-Fi station 接口已获取 IPv4 地址                        |
+-------------------------------------------+----------------------------------------------------------+
|[<conn_id>,]CONNECT                        |ID 为 <conn_id> 的网络连接已建立（默认情况下，ID 为 0）   |
+-------------------------------------------+----------------------------------------------------------+
|[<conn_id>,]CLOSED                         |ID 为 <conn_id> 的网络连接已断开（默认情况下，ID 为 0）   |
+-------------------------------------------+----------------------------------------------------------+
|+STA_CONNECTED:<sta_mac>                   |station 已连接到Wi-Fi softAP 接口                         |
+-------------------------------------------+----------------------------------------------------------+
|+DIST_STA_IP:<sta_mac>,<sta_ip>            |Wi-Fi softAP 接口给 station 分配IP 地址                   |
+-------------------------------------------+----------------------------------------------------------+
|+STA DISCONNECTED: <sta_mac>               |station 与 BK-AT 的 Wi-Fi softAP 接口的连接断开           |
+-------------------------------------------+----------------------------------------------------------+
|>                                          |正在等待用户输入数据                                      |
+-------------------------------------------+----------------------------------------------------------+
|+IPD                                       |已收到来自网络的数据                                      |
+-------------------------------------------+----------------------------------------------------------+
|+QUIT                                      |退出 Wi-Fi 透传模式                                       |
+-------------------------------------------+----------------------------------------------------------+
|+MQTTCONNECTED                             |MQTT 已连接到 broker                                      |
+-------------------------------------------+----------------------------------------------------------+
|+MQTTDISCONNECTED                          |MQTT 与 broker 已断开连接                                 |
+-------------------------------------------+----------------------------------------------------------+
|+MQTTSUBRECV                               |MQTT 已从 broker 收到数据                                 |
+-------------------------------------------+----------------------------------------------------------+
|+MQTTPUB:FAIL                              |MQTT 发布数据失败                                         |
+-------------------------------------------+----------------------------------------------------------+
|+MQTTPUB:OK                                |MQTT 发布数据完成                                         |
+-------------------------------------------+----------------------------------------------------------+
|+BLECONN                                   |Bluetooth LE 连接已建立                                   |
+-------------------------------------------+----------------------------------------------------------+
|+BLEDISCONN                                |Bluetooth LE 连接已断开                                   |
+-------------------------------------------+----------------------------------------------------------+
|+READ                                      |通过 Bluetooth LE 连接进行读取操作                        |
+-------------------------------------------+----------------------------------------------------------+
|+WRITE                                     |通过 Bluetooth LE 进行写入操作                            |
+-------------------------------------------+----------------------------------------------------------+
|+NOTIFY                                    |BluetoothLE 连接的 notification                           |
+-------------------------------------------+----------------------------------------------------------+
|+INDICATE                                  |来自 Bluetooth LE 连接的 indication                       |
+-------------------------------------------+----------------------------------------------------------+
|+BLESECNTFYKEY                             |Bluetooth LE SMP 密钥                                     |
+-------------------------------------------+----------------------------------------------------------+
|+BLESECREQ:<conn_index>                    |收到来自 Bluetooth LE 连接的加密配对请求                  |
+-------------------------------------------+----------------------------------------------------------+
|+BLEAUTHCMPL:<conn_index>,<enc_result>     |Bluetooth LE SMP 配对完成                                 |
+-------------------------------------------+----------------------------------------------------------+