diff --git a/protos/core_adapter.proto b/protos/core_adapter.proto
index c995b0d..24390f5 100644
--- a/protos/core_adapter.proto
+++ b/protos/core_adapter.proto
@@ -21,9 +21,15 @@
     bool val = 1;
 }
 
-enum ErrorCode {
+message Packet {
+    bytes payload = 1;
+}
+
+message ErrorCode {
+    enum codes {
         UNSUPPORTED_REQUEST = 0;
         INVALID_PARAMETERS = 1;
+    }
 }
 
 message Error {