change move to not retunr till complete. Fixes cockpit issue #844

Author: iandobbie

microscope/controllers/ludl.py

@@ -200,11 +200,13 @@ def move_command(self, command: bytes) -> None:
         # Movement commands respond with ":A \n" but the move is then
         # being performed.  The move is only finihsed once the
         # "STATUS" command returns "N" rather than "B"
-        # self._command_and_validate(command, b"N")
+        self._command_and_validate(command, b"N")
         #
+        # No Following is not true as Cockpit expects moves to happen
+        # before the return. 
         # actully beter to just issue the move command and rely on
         # other process to check position
-        self.get_command(command)
+        #self.get_command(command)
 
     def move_by_relative_position(self, axis: bytes, delta: float) -> None:
         """Send a relative movement command to stated axis"""