Results 2 issues of rikirolly

Just calling the metrics endpoint different times I get decreased values for **http_request_duration_seconds_count** variable ![graph](https://user-images.githubusercontent.com/1200467/190124143-5eadaa09-646d-45dd-a6e9-4a4d91442d35.png) It seems both values are increasing.

Importing the proxy `from cpppo.server.enip.get_attribute import proxy` I get the error: ```Exception has occurred: TypeError code() argument 13 must be str, not int File "/workspace/app/main.py", line 46, in from cpppo.server.enip.get_attribute...