Update the scan_info during the prepared event

bliss/data/nodes/scan.py

@@ -42,7 +42,7 @@ class ScanNode(DataNodeContainer):
     def dataset(self):
         return self.parent
 
-    def prepared(self):
+    def prepared(self, scan_info):
         """Publish PREPARED event in Redis
         """
         if not self.new_node:
@@ -51,6 +51,7 @@ class ScanNode(DataNodeContainer):
         # TODO: what does the comment above mean?
         with settings.pipeline(self._prepared_stream, self._info):
             event = PreparedScanEvent()
+            self._info.update(scan_info)
             self._prepared_stream.add_event(event)
 
     def end(self, exception=None):

bliss/scanning/scan.py

@@ -1280,7 +1280,8 @@ class Scan:
 
         self._fill_meta("fill_meta_at_scan_start")
 
-        self.node.prepared()
+        # The scan info was updated with device metadata
+        self.node.prepared(self._scan_info)
 
         self._axes_in_scan = self._get_data_axes(include_calc_reals=True)
         with execute_pre_scan_hooks(self._axes_in_scan):