resend RouterInfo after some interval

libi2pd/NTCP2.cpp

@@ -343,6 +343,8 @@ namespace transport
 			else
 				LogPrint (eLogWarning, "NTCP2: Missing NTCP2 parameters");
 		}
+		m_NextRouterInfoResendTime = i2p::util::GetSecondsSinceEpoch () + NTCP2_ROUTERINFO_RESEND_INTERVAL + 
+			rand ()%NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD;
 	}
 
 	NTCP2Session::~NTCP2Session ()
@@ -1012,6 +1014,13 @@ namespace transport
 			m_NumSentBytes += bytes_transferred;
 			i2p::transport::transports.UpdateSentBytes (bytes_transferred);
 			LogPrint (eLogDebug, "NTCP2: Next frame sent ", bytes_transferred);
+			if (m_LastActivityTimestamp > m_NextRouterInfoResendTime)
+			{
+				m_NextRouterInfoResendTime += NTCP2_ROUTERINFO_RESEND_INTERVAL + 
+					rand ()%NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD;
+				SendRouterInfo ();		
+			}	
+			else	
 				SendQueue ();
 		}
 	}

libi2pd/NTCP2.h

@@ -34,6 +34,8 @@ namespace transport
 	const int NTCP2_ESTABLISH_TIMEOUT = 10; // 10 seconds
 	const int NTCP2_TERMINATION_TIMEOUT = 120; // 2 minutes
 	const int NTCP2_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
+	const int NTCP2_ROUTERINFO_RESEND_INTERVAL = 25*60; // 25 minuntes in seconds
+	const int NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD = 25*60; // 25 minuntes
 
 	const int NTCP2_CLOCK_SKEW = 60; // in seconds
 	const int NTCP2_MAX_OUTGOING_QUEUE_SIZE = 500; // how many messages we can queue up
@@ -212,6 +214,7 @@ namespace transport
 
 			bool m_IsSending;
 			std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
+			uint64_t m_NextRouterInfoResendTime; // seconds since epoch
 	};
 
 	class NTCP2Server: private i2p::util::RunnableServiceWithWork