DeviceTcpNetSetPersistentConnection 方法

V11版本及之前设置长连接的方法，在V12版本以上中没有任何效果，默认长连接，删除调用即可，此处保留方法是为了部分用户保持兼容性升级。
The method of setting the long connection in V11 and before, has no effect in V12 and above. this method can be deleted. The method is retained here to maintain compatibility upgrades for some users.

[ObsoleteAttribute]
public void SetPersistentConnection()

<ObsoleteAttribute>
Public Sub SetPersistentConnection

public:
[ObsoleteAttribute]
void SetPersistentConnection()

[<ObsoleteAttribute>]
member SetPersistentConnection : unit -> unit