check tracker signal before rt move, which is otherwise stuck forever.

csaxs_bec/devices/omny/rt/rt_flomni_ophyd.py

@@ -394,7 +394,7 @@ class RtFlomniController(Controller):
         val = float(self.socket_put_and_receive(f"j{axis_number}").strip())
         return val
 
-    def laser_tracker_check_signalstrength(self):
+    def laser_tracker_check_signalstrength(self, verbose=True):
         if not self.laser_tracker_check_enabled():
             returnval = "disabled"
         else:
@@ -405,9 +405,10 @@ class RtFlomniController(Controller):
             rtx = self.device_manager.devices.rtx
             min_signal = rtx.user_parameter.get("min_signal")
             low_signal = rtx.user_parameter.get("low_signal")
-            print(f"low signal: {low_signal}")
-            print(f"min signal: {min_signal}")
-            print(f"signal: {signal}")
+            if verbose:
+                print(f"low signal: {low_signal}")
+                print(f"min signal: {min_signal}")
+                print(f"signal: {signal}")
             if signal < min_signal:
                 time.sleep(1)
                 if signal < min_signal:
@@ -621,6 +622,18 @@ class RtFlomniSetpointSignal(RtSetpointSignal):
                 "The interferometer feedback is not running. Either it is turned off or and"
                 " interferometer error occured."
             )
+
+        tracker_status = self.parent.controller.laser_tracker_check_signalstrength()
+
+        if tracker_status == "toolow":
+            print(
+                "The interferometer signal is too low for movements. Realignment required."
+            )
+            raise RtError(
+                "The interferometer signal is too low for movements. Realignment required."
+            )
+
+
         self.set_with_feedback_disabled(val)
 
     def set_with_feedback_disabled(self, val):