How to decode game network packets?

Question

Wireshark

There is such a question: is it possible to decode the network packets of the UDP game server / client?
The server is written in C# and uses the [RPC] interface.
The packets were intercepted by WireShark and decoded with different encodings like ASCII / EBCDIC, but did not parse anything sensible.
Is it possible to decode game network packets at all? Well, let's say the player sent a message to the chat, is it possible to decode the packets and find this message among them? And if so, how?

PS game on Unity 4.5, server port 25444

Answer 1

Perhaps the game traffic is encrypted, if you have the tools and knowledge, you can try to pull the certificate from the game client.
Z.Y. the game is called Unturned =)