Extra byte "FF" being added to the response message

Has anyone experienced additional bytes being added to a message that is passing through a Digi?

For instance the message below is from a device and is an acceptable message if I remove one pair of the FF’s. So I believe the digi may be duplicating that byte some how for some reason. The issue only occurs when the byte is FF

Response: 01 00 01 02 06 E5 00 0A 02 02 02 06 00 FF FF 28 05 00 00 04 00

Any chance 0xFF is an escape/control character? Could be your sending side is inserting an extra 0xFF to escape the raw 0xFF, much like for a single backslash in C strings you need to use “\”.