moved flush() to after the command has been written, to avoid lingering data

Brendan Whitfield · Brendan Whitfield · commit c879c70b0e04 · 2015-06-01T15:28:31.000-04:00
diff --git a/obd/elm327.py b/obd/elm327.py
@@ -308,9 +308,9 @@ def __write(self, cmd):
 
         if self.__port:
             cmd += "\r\n" # terminate
-            self.__port.flush()
-            self.__port.flushInput()
-            self.__port.write(cmd.encode()) # turn the string into bytes
+            self.__port.flushInput() # dump everything in the input buffer
+            self.__port.write(cmd.encode()) # turn the string into bytes and write
+            self.__port.flush() # wait for the output buffer to finish transmitting
             debug("write: " + repr(cmd))
         else:
             debug("cannot perform __write() when unconnected", True)
