add response_required arg to conditionally ignore serial responses

hardware-testing/hardware_testing/modules/flex_stacker_evt_qc/driver.py

@@ -119,11 +119,15 @@ def __init__(self, port: str, simulating: bool = False) -> None:
         if not self._simulating:
             self._serial = serial.Serial(port, baudrate=STACKER_FREQ, timeout=60)
 
-    def _send_and_recv(self, msg: str, guard_ret: str = "") -> str:
+    def _send_and_recv(
+        self, msg: str, guard_ret: str = "", response_required=True
+    ) -> str:
         """Internal utility to send a command and receive the response."""
         assert not self._simulating
         self._serial.reset_input_buffer()
         self._serial.write(msg.encode())
+        if not response_required:
+            return "OK\n"
         ret = self._serial.readline()
         if guard_ret:
             if not ret.startswith(guard_ret.encode()):
@@ -160,7 +164,7 @@ def stop_motor(self) -> None:
         """Stop motor movement."""
         if self._simulating:
             return
-        self._send_and_recv("M0\n")
+        self._send_and_recv("M0\n", response_required=False)
 
     def get_limit_switch(self, axis: StackerAxis, direction: Direction) -> bool:
         """Get limit switch status.