L2SS-496: Expose the current measures dir as a monitoring point

tangostationcontrol/tangostationcontrol/devices/beam.py

@@ -8,8 +8,10 @@
 """
 
 # PyTango imports
+from tango.server import attribute
 from tango import AttrWriteType
 import numpy
+import pathlib
 # Additional import
 
 from tangostationcontrol.devices.device_decorators import *
@@ -31,7 +33,9 @@ class Beam(lofar_device):
     # Attributes
     # ----------
 
-    pass
+    # Directory where the casacore measures that we use, reside. We configure ~/.casarc to
+    # use /opt/IERS/current, but that is a symlink, so resolve it to get the actual location.
+    measures_directory_R = attribute(dtype=str, access=AttrWriteType.READ, fget=lambda self: str(pathlib.Path("/opt/IERS/current").resolve()))
 
     # --------
     # overloaded functions