log checksum errors as warning; dont force full telegram signatures; removed unused code for automatic telegram version detection;

dsmr_parser/clients/protocol.py

@@ -101,6 +101,8 @@ class DSMRProtocol(asyncio.Protocol):
 
         try:
             parsed_telegram = self.telegram_parser.parse(telegram)
+        except InvalidChecksumError as e:
+            self.log.warning(str(e))
         except ParseError:
             self.log.exception("failed to parse telegram")
         else: