publish retry on failure for introset publishing

llarp/service/endpoint.cpp

@@ -694,7 +694,16 @@ namespace llarp
     void
     Endpoint::IntroSetPublishFail()
     {
-      // TODO: linear backoff
+      auto now = Now();
+      if(ShouldPublishDescriptors(now))
+      {
+        RegenAndPublishIntroSet(now);
+      }
+      else if(NumInStatus(llarp::path::ePathEstablished) < 3)
+      {
+        if(m_IntroSet.HasExpiredIntros(now))
+          ManualRebuild(1);
+      }
     }
 
     bool