create new ratchets session if previous was not replied

libi2pd/ECIESX25519AEADRatchetSession.h

@@ -169,6 +169,7 @@ namespace garlic
 			bool IsInactive (uint64_t ts) const { return ts > m_LastActivityTimestamp + ECIESX25519_INACTIVITY_TIMEOUT && CanBeRestarted (ts); }
 			
 			bool IsRatchets () const { return true; };
+			bool IsReadyToSend () const { return m_State != eSessionStateNewSessionSent; };
 			uint64_t GetLastActivityTimestamp () const { return m_LastActivityTimestamp; };
 
 		private:

libi2pd/Garlic.h

@@ -114,6 +114,7 @@ namespace garlic
 			virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession
 			virtual bool MessageConfirmed (uint32_t msgID);
 			virtual bool IsRatchets () const { return false; };
+			virtual bool IsReadyToSend () const { return true; };
 			virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only
 
 			void SetLeaseSetUpdated ()

libi2pd/Streaming.cpp

@@ -756,7 +756,7 @@ namespace stream
 				return;
 			}
 		}
-		if (!m_RoutingSession || !m_RoutingSession->GetOwner ()) // expired and detached
+		if (!m_RoutingSession || !m_RoutingSession->GetOwner () || !m_RoutingSession->IsReadyToSend ()) // expired and detached or new session sent
 			m_RoutingSession = m_LocalDestination.GetOwner ()->GetRoutingSession (m_RemoteLeaseSet, true);
 		if (!m_CurrentOutboundTunnel && m_RoutingSession) // first message to send
 		{