P2P multiplayer android NAT traversal solutions/libraries?

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I'm writing a multiplayer android game, in which the reliability of connection between peers doesn't matter, as the only multiplayer aspect of it is informative (each group of players get the same puzzle ad the P2P connections are used to inform each player of the others' progress each 5 seconds), I can use a matchmaking service like this to communicate the ips of the matched group, but I've no idea where to go from there,I only kow that i can not establish direct connections between players behind NATs,I found some solutions but they were all costly or restrictive (for example photon), so my question is What are the available NAT traversal solutions/libraries that can be used for multiplayer android game development for free?

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