only generate csv file for powerprofiling if at least one observer uses csv format

testmanagementserver/flocklab_fetcher.py

@@ -1179,6 +1179,14 @@ def main(argv):
             elif service == 'gpiotracing':
                 header = 'timestamp,observer_id,node_id,pin_name,value\n'
             elif service == 'powerprofiling':
+                # determine whether at least one observer uses CSV format
+                usesCSV = False
+                for obs in powerprofconf:
+                    if powerprofconf[obs]['format'] == 'csv':
+                        usesCSV = True
+                        break
+                if not usesCSV:
+                    continue      # skip file creation (rld format is selected on all observers)
                 header = 'timestamp,observer_id,node_id,current_mA,voltage_V\n'
             elif service == 'serial':
                 header = 'timestamp,observer_id,node_id,direction,output\n'