ISteamNetworkingConnectionSignaling

Called when the connection no longer needs to send signals. Note that this happens eventually (but not immediately) after the connection is closed. Signals may need to be sent for a brief time after the connection is closed, to clean up the connection. If you do not need to save any additional per-connection information and can handle SendSignal() using only the arguments supplied, you do not need to actually create different objects per connection. In that case, it is valid for all connections to use the same global object, and for this function to do nothing.

public void Release()

Called to send a rendezvous message to the remote peer. This may be called from any thread, at any time, so you need to be thread-safe! Don't take any locks that might hold while calling into SteamNetworkingSockets functions, because this could lead to deadlocks. Note that when initiating a connection, we may not know the identity of the peer, if you did not specify it in ConnectP2PCustomSignaling. Return true if a best-effort attempt was made to deliver the message. If you return false, it is assumed that the situation is fatal; the connection will be closed, and Release() will be called eventually. Signaling objects will not be shared between connections. You can assume that the same value of hConn will be used every time.

public bool SendSignal(HSteamNetConnection hConn, ref SteamNetConnectionInfo_t info, nint pMsg, int cbMsg)