properly fail on version checks

sdk/rust/nym-sdk/src/error.rs

@@ -156,6 +156,12 @@ pub enum Error {
 
     #[error("no IPR address on selected gateway")]
     NoIPRAvailable,
+
+    #[error("message version check failed: {0}")]
+    IPRMessageVersionCheckFailed(String),
+
+    #[error("no response id found in connect response")]
+    IPRNoId,
 }
 
 impl Error {

sdk/rust/nym-sdk/src/stream_wrapper/mixnet_stream_wrapper_ipr.rs

@@ -232,13 +232,16 @@ impl IpMixStream {
                         }
                         Some(Ok(reconstructed)) => {
                             if let Err(e) = check_ipr_message_version(&reconstructed) {
-                                error!("Version check failed: {}", e);
-                                continue;
+                                return Err(Error::IPRMessageVersionCheckFailed(e.to_string()));
+
                             }
                             if let Ok(response) = IpPacketResponse::from_reconstructed_message(&reconstructed) {
                                 if response.id() == Some(request_id) {
                                     return self.handle_connect_response(response).await;
                                 }
+                                else {
+                                    return Err(Error::IPRNoId)
+                                }
                             }
                         }
                     }