Error: "...'Ports' does not exist ..." for iOS platform

Hi

My bluetooth project is working well when platform is PC/Mac, but the building is failed with iOS platform.

The code is broken at

Code (CSharp):

1. using System.IO.Ports;

Error:

Code (CSharp):

1. Assets/Script1.cs(4,17): error CS0234: The type or namespace name 'Ports' does not exist in the namespace 'System.IO' (are you missing an assembly reference?)
2.  

My project setting for "iOS platform":

• Scripting Runtime Version: .NET 4.x Equivalent
• Scripting Backend : IL2CPP (it's greyed out as the only one option)
• Api Compatibility Level : .NET Standard 2.0

My Env:

• macOS Mojave 10.14.5
• Unity 2019.1.2f1
• Visual Studio for Mac community, v8.0.8 (build 2)
• Xcode 10.2.1

I googled a lot and checked all related discussion, they don't solve or related to this issue.

Thanks in prior.

 

Pretty sure you need to use the native stuff for those platforms. They don't let you access the deamons and such from the sandbox.

 

Sorry for just noticing its in wrong category, should be "support" board.