use baudrate specific inter frame sleep time in _uart_read function of serial.py, related to #34

Author: brainelectronics

umodbus/serial.py

@@ -173,7 +173,9 @@ def _uart_read(self) -> bytearray:
                 # variable length function codes may require multiple reads
                 if self._exit_read(response):
                     break
-            time.sleep(0.05)
+
+            # wait for the maximum time between two frames
+            time.sleep(self._t35chars)
 
         return response