Much work

src/frame/settings.rs

@@ -81,6 +81,7 @@ impl Settings {
 
         // Ensure the payload length is correct, each setting is 6 bytes long.
         if payload.len() % 6 != 0 {
+            debug!("invalid settings payload length; len={:?}", payload.len());
             return Err(Error::InvalidPayloadAckSettings);
         }