Using Serial with Processing for Android

Processing for Android
3

@noel very helpful. Latest version of library no longer causes crash. However, now I get the following error message and I’m not sure how to fix it:

Processing-Android USB Serial ERROR

Port:null
Check the following:
1) Make sure AndroidManifest.xm. contains <use-feature> tag for android.hardware.usb.host
2) USB Serial is connected to the device

I’m trying to get this demo to run on a Samsung tablet using an Arduino UNO connected to a Mac mini as the data source. The UNO has a classic Bluetooth shield which is sending test data (tested in another Processing java app and this is working). I have checked all the Bluetooth boxes under Android/Sketch Permissions but do not see “use-feature” in the manifest which is shown below:

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="processing.test.serialtest">
    <uses-sdk android:minSdkVersion="17" android:targetSdkVersion="28"/>
    <application android:icon="@mipmap/ic_launcher" android:label="serialTest">
        <activity android:name=".MainActivity" android:theme="@style/Theme.AppCompat.Light.NoActionBar.FullScreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED"/>
</manifest>

How would I add a tag for android.hardware.usb.host to the manifest in Processing?

I greatly appreciate your help.