What is the encoding method in this trz file, and how to decode it

Question

In the following xml file, what is the coding method for the data field. The string is "3ATcBNwE3ATcBA=="

How to decode it?

Thank you very much.

<unix_time>1485991810</unix_time>
<data_id>16</data_id>
<interval>60</interval>
<count>5</count>
<data>3ATcBNwE3ATcBA==</data>

Answer 1

It's base64 (the == padding at the end sort of gives it away). It decodes into 0xdc04 0xdc04 0xdc04 0xdc04 0xdc04.