chrisdutz commented on a change in pull request #170:
URL: https://github.com/apache/plc4x/pull/170#discussion_r452018041



##########
File path: 
plc4j/drivers/s7/src/main/java/org/apache/plc4x/java/s7/readwrite/protocol/S7ProtocolLogic.java
##########
@@ -299,6 +319,14 @@ public void onConnect(ConversationContext<TPKTPacket> 
context) {
         return future;
     }
 
+    /**
+     * This method is only called when there is no Response Handler.
+     */
+    @Override
+    protected void decode(ConversationContext<TPKTPacket> context, TPKTPacket 
msg) throws Exception {
+        throw new IllegalStateException("This should not happen!");

Review comment:
       Well it actually could happen ... yesterday I noticed that error 
responses would go here ... but it's a good place for starting to implement 
some sort of error handling.




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