jfjoch: added custom excpetions

src/aare/devices/jfjoch.py

@@ -3,6 +3,7 @@ import math
 import jfjoch_client
 
 from aare.common.beamline import MXBeamline
+from aare.common.exception_handler import JFJochCommunicationError
 from aare.common.models import DAQStatusModel, FluorescenceSpectrumOutputModel
 from aare.common.raster_grid import RasterGridRequest
 from aare.common.rotation_scan import RotationScanRequest
@@ -98,7 +99,18 @@ class JFJochWrapper:
             detect_ice_rings=True,
             xray_fluorescence_spectrum=xrf
         )
-        self.__api.start_post(dataset_settings=dataset_settings)
+        try:
+            self.__api.start_post(dataset_settings=dataset_settings)
+        except Exception as e:
+            scan_type = "rotation"
+            if r.screening:
+                scan_type = "screening"
+            raise JFJochCommunicationError(
+                f"JFJoch data collection failed to initialize for {scan_type} scan",
+                operation="POST",
+                endpoint="start_post",
+                base_url=self.__url,
+            ) from e
 
     def measure_raster(self,
                        r: RasterGridRequest,
@@ -146,13 +158,29 @@ class JFJochWrapper:
             max_spot_count = 1000,
             detect_ice_rings = True
         )
-        self.__api.start_post(dataset_settings=dataset_settings)
+        try:
+            self.__api.start_post(dataset_settings=dataset_settings)
+        except Exception as e:
+            raise JFJochCommunicationError(
+                "JFJoch data collection failed to initialize for raster scan",
+                operation="POST",
+                endpoint="start_post",
+                base_url=self.__url,
+            ) from e
 
     def wait_till_done(self, timeout : int | float) -> jfjoch_client.models.ScanResult | None:
         if self.__simulated:
             return None
-        self.__api.wait_till_done_post_with_http_info(timeout=math.ceil(timeout))
-        return self.__api.result_scan_get()
+        try:
+            self.__api.wait_till_done_post_with_http_info(timeout=math.ceil(timeout))
+            return self.__api.result_scan_get()
+        except Exception as e:
+            raise JFJochCommunicationError(
+                "JFJoch wait/result retrieval failed",
+                operation="GET",
+                endpoint="wait_till_done_post / result_scan_get",
+                base_url=self.__url,
+            ) from e
 
     def detector(self) -> jfjoch_client.models.DetectorListElement:
         l = self.__api.config_select_detector_get()