Unity - iPad mini - BT UPC Scanner - no work...

Unity Engine
1

Hi all,
thing is the scanner works fine in any other app I try, like excel or notes. UPC is ‘typed’ (HID device) into wherever the cursor is. However in Unity it either doesn’t work at all, or I get missing digits. I’ve tried every which way I know.
What I’m currently doing is basically right from here: Unity - Scripting API: Input.inputString Reading the inputString directly from the Input system. Works without fail in Windows but either not at all, or just intermittently on the mini.
So right now I just built a test with just a TMP Input field and no code at all. Just trying to get the scanner to type into the field. And still I get nothing or missing chars’. Switch to Notes app and it’s perfect. So it’s Unity - but just on the iPad mini because same code works in Win. And Scanner works on the mini in other apps. Really at a loss. Bug?

2 
public class InputTest : MonoBehaviour
{
    public TextMeshProUGUI final;
    public TMP_InputField barcodeField;

    public void Start()
    {
        barcodeField.Select();
        barcodeField.ActivateInputField();
    }
   
    private void Update()
    {
        ReadBarcodeInput();
    }
   
    private void ReadBarcodeInput()
    {
        foreach (char c in Input.inputString)
        {
            if ((c == "\n"[0]) || (c == "\r"[0]))
            {
                final.text = barcodeField.text;
                barcodeField.text = "";
            }
            else
            {
                barcodeField.text += c;
            }
        }
    }   
}

So this is the code I’m testing with right now. On Windows, using an Input field, I get double characters when typing, and two UPC codes when scanning. As I would expect - since I’m appending into an input field, not a text field.
On the iPad mini however, it’s totally different. If I disable the soft keyboard, in the input field options, then when I scan I get an incomplete barcode - but I also get the \r which clears the field and sets final.text to the scanned code. When I don’t disable the soft keyboard I get the full UPC, consistently! Perfect! However the code detects no \r or \n and I only get one set of numbers - I don’t get two like on Windows.
Anyone make sense of this???

3

One more thing - on Windows I can just use an OnSubmit listener on an input field and the scanning works great. Doesn’t work on the mini which is why I went to grabbing inputString directly.

4

Just tried a BT keyboard. Inputs into the field, but pressing Enter does nothing. ie the code looking at Input.inputString does not see \r or \n when Enter is pressed.

5

BTW ChatGPT, which is 100% regarded, suggests using OnGUI to listen to the keyboard events. LOL