STUN-related code extracted from STK codebase (from f2c26f0 revision of get_public_address.cpp).
Intended as a test for one of possible NAT Traversal implementations for 0 A.D. (see details here: #2305 UDP Hole Punching / NAT Traversal).
Example output:
GetPublicAddress: Using STUN server stun1.voiceeclipse.net
GetPublicAddress: Sending STUN request to: 64.24.35.201:3478
GetPublicAddress: sendto result: 20
GetPublicAddress: recvfrom result: 88
GetPublicAddress: The STUN server responded with a valid answer
GetPublicAddress: The public address has been found: 31.23.155.65:36832