keep sending through first successive routing path

libi2pd/Datagram.cpp

@@ -296,7 +296,23 @@ namespace datagram
 		}	
 
 		if (!m_RoutingSession || !m_RoutingSession->GetOwner ()) 
-			m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true);
+		{
+			bool found = false;
+			for (auto& it: m_PendingRoutingSessions)
+				if (it->GetOwner ()) // found established session
+				{
+					m_RoutingSession = it;
+					m_PendingRoutingSessions.clear ();
+					found = true;
+					break;
+				}		
+			if (!found)
+			{	
+				m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true);
+				if (!m_RoutingSession->GetOwner ())
+					m_PendingRoutingSessions.push_back (m_RoutingSession);
+			}	
+		}	
 		
 		auto path = m_RoutingSession->GetSharedRoutingPath();
 		if (path) 
@@ -345,8 +361,6 @@ namespace datagram
 					auto idx = rand() % sz;
 					path->remoteLease = ls[idx];
 				}
-				
-			
 			} 
 			else 
 			{

libi2pd/Datagram.h

@@ -95,6 +95,7 @@ namespace datagram
 			i2p::data::IdentHash m_RemoteIdent;
 			std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
 			std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
+			std::vector<std::shared_ptr<i2p::garlic::GarlicRoutingSession> > m_PendingRoutingSessions;
 			std::vector<std::shared_ptr<I2NPMessage> > m_SendQueue;
 			uint64_t m_LastUse;
 			bool m_RequestingLS;