Revision Difference
Sending_P2P_Messages#524751
<cat>code.networking</cat>⤶
<title>P2P Networking</title>⤶
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Steam has a mechanism allowing you to send packets to another Steam user. ⤶
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It's totally feasible to create a game's netcode using this system.⤶
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<note>In the past we used this in Rust to send voice communications instead of bouncing it off the server. We ultimately stopped doing this because it revealed your IP.</note>⤶
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# Sending Messages⤶
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```⤶
byte[] mydata = ...⤶
SteamId TargetSteamId = ...⤶
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var sent = SteamNetworking.SendP2PPacket( TargetSteamId, mydata );⤶
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// if sent is true - the data was sent !⤶
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```⤶
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# Receiving Messages⤶
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You need to set up a callback so you can authorize who can send you messages⤶
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```⤶
SteamNetworking.OnP2PSessionRequest = ( steamid ) =>⤶
{⤶
// If we want to let this steamid talk to us⤶
SteamNetworking.AcceptP2PSessionWithUser( steamid );⤶
}⤶
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```⤶
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Then just call something like this regularly⤶
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```⤶
while ( SteamNetworking.IsP2PPacketAvailable() )⤶
{⤶
var packet = SteamNetworking.ReadP2PPacket();⤶
if ( packet.HasValue )⤶
{⤶
HandleMessageFrom( packet.Value.SteamId, packet.Value.Data );⤶
}⤶
}⤶
```⤶
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Your HandleMessageFrom function should look like this⤶
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```⤶
void HandleMessageFrom( SteamId steamid, Data data )⤶
{⤶
.. do stuff⤶
}⤶
```⤶
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# Further Reading⤶
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There are less garbage creating versions of some of the functions here on the <page>SteamNetworking</page> class.⤶
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Although the p2p stuff is easy and will work out for a lot of situations, you should look at <page>SteamNetworkingSockets</page> if you're planning to make a game with client/server architecture with 10+ players sending updates multiple times a second.⤶
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