RPCs are not obscured: How to obscure them?

Players are able to use packet sniffing software to view secret traffic. It looks like this:

0310 7a 00 01 6b 00 0b 62 02 69 c4 da 51 dc 62 00 69 z..k..b.i..Q.b.i
0b = (some secret revealed)

CN+39: listPos
0060 04 62 05 62 6c 62 04 7a 00 01 6b 00 [05] 62 02 69 .b.blb.z..k..b.i
05 = (another secret revealed) in our context, 05 reveals that x class is #6 (5+1, index, I guess).

I'm honestly not sure how he does it - I'm not a hacker, but he was curious why our game server doesn't "obscure RPCs".

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