Add debug information about received data

StatsCrosslet-DS/StatsCrosslet.py

@@ -72,7 +72,7 @@ class StatsCrosslet(Device):
                 try:
                     self.debug_stream("fetching data:  subband = %d, integration_time = %d", self._subband, self._integration_time)
                     t, visibilities_list, rcu_modes = self.obj.call_method(self.record_cross, self._subband, self._integration_time)
-                    self.debug_stream("fetching data done")
+                    self.debug_stream("fetching data done: t = %s, len(visibilities_list) = %d, len(rcu_modes) = %d", t, len(visibilities_list), len(rcu_modes))
                     self._time_stamp = t
                     visibilities = numpy.array(visibilities_list)[0] + 1j * numpy.array(visibilities_list[1])
                     self._visibilities_real = visibilities.real