How to locate tags by barcode (EAN) instead of EPC

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Hello,

We are developing an app for a Zebra TC20 device in order to perform inventories (we use a handheld Zebra RFD8500 reader to read RFID tags).

We are interested in locating tags with the RFD8500 using only the barcode of the tags instead of the full EPC.

Example: suppose we have 3 tags:
- Tag 1 -> Barcode: 8433594013132 // EPC: 843359401313200001723799
- Tag 2 -> Barcode: 8433594013132 // EPC: 843359401313200001723158
- Tag 3 -> Barcode: 8433594013300 // EPC: 843359401330000001832435

As we can see, Tags 1 and 2 start with 8433594013132. We want the RFD8500 to beep when we approach it to the tags just using its EAN instead of the full EPC.

In Zebra Docs (https://techdocs.zebra.com/dcs/rfid/android/2-15/apis/reference/com/zebr...), there is a method to make the RFD8500 beep when you are close to a tag using its EPC (tagID):

public void Perform(java.lang.String tagID, java.lang.String epcMask, AntennaInfo antennaInfo)

(Following the previous example -> Perform(843359401313200001723799, null, null); will make the handheld device beep when we are close to the Tag 1, but it will not beep when we are close to Tag 2, because is a different EPC)

Apparently, you could pass an EPC Mask as parameter in order to look for non-specific item from a group (as we can read in "What's Next" section of https://techdocs.zebra.com/dcs/rfid/android/2-15/tutorials/locate/):

Perform(843359401313200001723799, "CERTAIN_MASK", null);

The problem is that we can not find any information about the format of the "String epcMask" parameter. Can anyone give us a hint about the value we must pass to the Perform method as "epcMask" in order to do what we have explained?

Thank you in advance.