Unity3d app for UWP freeze when using SerialDevice - unity3d

Question

I have a piece of code that I want to use with Unity 2018.2.14.f1.
#if UNITY_WSA && !UNITY_EDITOR
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Windows.Devices.Enumeration;
using Windows.Devices.SerialCommunication;
namespace SerialForUWP
{
public class SerialComHelper
{
public async static Task<string[]> GetPorts()
{
var serials = SerialDevice.GetDeviceSelector();
var coms = await DeviceInformation.FindAllAsync(serials);
List<string> results = new List<string>();
foreach (var device in coms)
{
using (var serialDevice = await SerialDevice.FromIdAsync(device.Id))
{
if (serialDevice != null)
{
var port = serialDevice.PortName;
results.Add(port.ToString());
}
}
}
return results.ToArray();
}
}
}
#endif
I compile for UWP using IL2CPP :
I also already updated the manifest of the cpp projet :
<DeviceCapability Name="serialcommunication">
<Device Id="any">
<Function Type="name:serialPort" />
</Device>
</DeviceCapability>
As soon as I try to use the GetPorts() function my app freeze.
void Update()
{
text.text = Time.time.ToString();
if (Input.GetKeyUp(KeyCode.Space))
{
try
{
#if UNITY_WSA && !UNITY_EDITOR
foreach (var com in SerialForUWP.SerialComHelper.GetPorts().Result)
{
text.text = com;
}
#endif
}
catch (Exception ex)
{
text.text = ex.ToString();
}
}
}
I got no error, no exception.
Can anyone help please ?

Answer 1

To get the exceptions use:
Debug.Log(ex.ToString()) instead of Text.text = ex.ToString()

Answer 2

According to this answer I can't use .Result