'Zebra RFID API TagData.getEventTimestamp() returns null from RFD8500

I am using the Zebra RFID API 3 SDK 2.0.1.34 to scan RFID tags with the RFD8500 scanner. In my implementation of the eventReadNotify() method from the RfidEventsListener interface, I am extracting the tag ID, RSSI, and timestamp fields. However, the timestamp, which I am trying to get by using the TagData.getTagEventTimeStamp() method, is always null.

            for (int i = 0; i < tagArray.getLength(); i++) {
                TagData tag = tagArray.getTags()[i];
                Log.i("RFID", "Tag ID = " + tag.getTagID());
                Log.w ("RFID", "RSSI " + tag.getPeakRSSI());
                Log.w("RFID", "timestamp " + tag.getTagEventTimeStamp());
                this.dispatchEvent("TagEvent", tag.getTagID());
            }

2021-07-20 15:45:16.563 4972-5115/com.radargunn.dev I/RFID: Tag ID = 309406C9D820900000000000
2021-07-20 15:45:16.563 4972-5115/com.radargunn.dev W/RFID: RSSI -51
2021-07-20 15:45:16.563 4972-5115/com.radargunn.dev W/RFID: timestamp null
2021-07-20 15:45:16.563 4972-5115/com.radargunn.dev I/RFID: Tag ID = 30540BDF402E84C000000002
2021-07-20 15:45:16.563 4972-5115/com.radargunn.dev W/RFID: RSSI -62
2021-07-20 15:45:16.564 4972-5115/com.radargunn.dev W/RFID: timestamp null

Is there some configuration setting I need to change to get this to work?

rfid


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