默认/操作系统管理组 操作系统管理组定义了以下命令: Command ID Command description 0 Echo 1 Console/Terminal echo control; unimplemented by Zephyr 2 Statistics 3 Memory pool statistics 4 Date-time string; unimplemented by Zephyr 5 System reset 6 MCUMGR parameters 响应命令 通过发送已收到的字符串来发送Echo命令响应。 响应请求 Echo请求头字段: OP