SiemensPPIServerMessage 方法

检查头子节的合法性
Check the legitimacy of the head subsection

检查发送的接收的报文是否是匹配的，如果匹配，则返回 1, 如果不匹配且直接返回错误，则返回 0，如果不匹配继续接收，直到匹配或是超时，则返回 -1
If the packet is matched, 1 is returned. If the packet is not matched and an error is returned, 0 is returned. If the packet is not matched, -1 is returned until the packet is matched or times out

当消息头报文的长度定义为-1的时候，则使用动态的长度信息，可以使用本方法来判断一个消息是否处于完整的状态。
If the length of the message header is defined as -1, this method can be used to determine whether a message is in the complete state by using dynamic length information.

Determines whether the specified object is equal to the current object.

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.

从当前的头子节文件中提取出接下来需要接收的数据长度
Extract the length of the data to be received from the current header file

Serves as the default hash function.

获取头子节里的消息标识
Get the message ID in the header subsection

Gets the Type of the current instance.

Creates a shallow copy of the current Object.

在接收头报文的时候，返回前置无效的报文头字节长度，默认为0，不处理
When receiving a header message, return the header byte length of the invalid header, the default is 0, and no processing is performed.

Returns a string that represents the current object.

获取当前对象的JSON格式表示的字符串。
Gets the string represented by the JSON format of the current object.