feat(npoint): add retry to initial readout and improve error message

csaxs_bec/devices/npoint/npoint.py

@@ -3,6 +3,7 @@ import threading
 import time
 
 import numpy as np
+from bec_lib.logger import bec_logger
 from ophyd import Component as Cpt
 from ophyd import Device, PositionerBase, Signal, SignalRO
 from ophyd.status import wait as status_wait
@@ -11,6 +12,8 @@ from ophyd_devices.utils.controller import Controller, threadlocked
 from ophyd_devices.utils.socket import SocketIO, SocketSignal, raise_if_disconnected
 from prettytable import PrettyTable
 
+logger = bec_logger.logger
+
 
 def channel_checked(fcn):
     """Decorator to catch attempted access to channels that are not available."""
@@ -453,7 +456,25 @@ class NPointAxis(Device, PositionerBase):
         The setpoint is only stored locally. After a restart,
         we need to update it to match the current readback value.
         """
-        self.user_setpoint.setpoint = self.readback.get()
+        for attempt in range(5):
+            try:
+                self.user_setpoint.setpoint = self.readback.get()
+            except Exception as e:
+                logger.warning(
+                    f"NPointAxis {self.name}: Failed to update the setpoint from the readback value on attempt {attempt+1} during startup: {e}"
+                )
+                time.sleep(1)
+            else:
+                logger.info(
+                    f"NPointAxis {self.name}: Successfully updated the setpoint from the readback value on attempt {attempt+1} during startup."
+                )
+                break
+        else:
+            raise TimeoutError(
+                f"NPointAxis {self.name}: Failed to update the setpoint from the readback value after 5 attempts during startup. This may happen occasionally. "
+                f"Try to reload the config and if the problem persists, check the connection to the nPoint controller "
+                f"and ensure that it is powered on and accessible at {self.controller._socket_host}:{self.controller._socket_port}."
+            )
 
     def destroy(self):
         """Make sure to turn off the controller socket on destroy."""