Sonar qube 6 (#174)

* test class ModbusConn

app/src/async_stream.py

@@ -3,10 +3,15 @@ import logging
 import traceback
 import time
 from asyncio import StreamReader, StreamWriter
-from messages import hex_dump_memory, State
 from typing import Self
 from itertools import count
 
+if __name__ == "app.src.async_stream":
+    from app.src.messages import hex_dump_memory, State
+else:  # pragma: no cover
+    from messages import hex_dump_memory, State
+
+
 import gc
 logger = logging.getLogger('conn')