fix #1363 try connect in SSU's thread

libi2pd/Transports.cpp

@@ -562,7 +562,10 @@ namespace transport
 					{
 						auto addr = router->GetSSUV6Address ();
 						if (addr)
-							m_SSUServer->CreateDirectSession (router, { addr->host, (uint16_t)addr->port }, false);
+							m_SSUServer->GetServiceV6 ().post ([this, router, addr]
+							{
+								m_SSUServer->CreateDirectSession (router, { addr->host, (uint16_t)addr->port }, false);				
+							});
 					}
 				}
 			}