[modbus] added defaut timeout for modbus connections

pyheatpump/modbus.py

@@ -5,7 +5,7 @@ from umodbus.client.serial import rtu
 import umodbus
 from pprint import pprint
 
-from pyheatpump.conf import config
+from .config import config
 
 serial_conn = None
 
@@ -20,7 +20,8 @@ def connect():
             baudrate=config.get('heatpump', 'baudrate'),
             bytesize=8,
             parity='N',
-            stopbits=1)
+            stopbits=1,
+            timeout=10)
 
     if serial_conn.open is False:
         print('Opening serial port')