don't change ConnIDs of just introduced session. Let Charlie recognize SessionRequest

libi2pd/SSU2Session.cpp

@@ -219,16 +219,23 @@ namespace transport
 	{
 		if (m_State == eSSU2SessionStateIntroduced)
 		{
-			// create new connID
+			// we are Alice
-			uint64_t oldConnID = GetConnID ();
+			//  keep ConnIDs used for introduction, because Charlie waits for SessionRequest from us
-			RAND_bytes ((uint8_t *)&m_DestConnID, 8);
-			RAND_bytes ((uint8_t *)&m_SourceConnID, 8);
-			// connect
 			m_State = eSSU2SessionStateTokenReceived;
-			m_Server.AddPendingOutgoingSession (shared_from_this ());
+			// move session to pending outgoing
-			m_Server.RequestRemoveSession (oldConnID);
+			if (m_Server.AddPendingOutgoingSession (shared_from_this ()))
+			{                                                             
+				m_Server.RemoveSession (GetConnID ());
+				// connect
+				LogPrint (eLogDebug, "SSU2: Connecting after introduction to ", GetIdentHashBase64());
 				Connect ();
 			}
+			else 
+			{
+				LogPrint (eLogError, "SSU2: Session ", GetConnID (), " is already pending");
+				m_Server.RequestRemoveSession (GetConnID ());
+			}	
+		}
 	}
 
 	void SSU2Session::SendPeerTest ()