use rx id on snode side of paths

set protocol on reply routing messages

llarp/exit/endpoint.cpp

@@ -190,15 +190,17 @@ namespace llarp
       if (queue.size() == 0)
       {
         queue.emplace_back();
+        queue.back().protocol = type;
         return queue.back().PutBuffer(pktbuf, m_Counter++);
       }
       auto& msg = queue.back();
       if (msg.Size() + pktbuf.sz > llarp::routing::ExitPadSize)
       {
         queue.emplace_back();
+        queue.back().protocol = type;
         return queue.back().PutBuffer(pktbuf, m_Counter++);
       }
-
+      msg.protocol = type;
       return msg.PutBuffer(pktbuf, m_Counter++);
     }
 

llarp/handlers/exit.cpp

@@ -64,18 +64,21 @@ namespace llarp
       {
         service::ConvoTag tag{};
         auto visit = [&tag](exit::Endpoint* const ep) -> bool {
-          if (ep)
-            tag = service::ConvoTag{ep->LocalPath().as_array()};
+          if (not ep)
+            return false;
+          tag = service::ConvoTag{ep->LocalPath().as_array()};
           return true;
         };
         if (VisitEndpointsFor(PubKey{*rid}, visit) and not tag.IsZero())
           return tag;
         auto itr = m_SNodeSessions.find(*rid);
         if (itr == m_SNodeSessions.end())
+        {
           return std::nullopt;
+        }
         if (auto path = itr->second->GetPathByRouter(*rid))
         {
-          tag = service::ConvoTag{path->TXID().as_array()};
+          tag = service::ConvoTag{path->RXID().as_array()};
           return tag;
         }
         return std::nullopt;
@@ -144,7 +147,7 @@ namespace llarp
               {
                 if (auto path = session->GetPathByRouter(routerID))
                 {
-                  hook(service::ConvoTag{path->TXID().as_array()});
+                  hook(service::ConvoTag{path->RXID().as_array()});
                 }
                 else
                   hook(std::nullopt);