Add command update_station_last_seen

docs/contribute.rst

@@ -94,6 +94,15 @@ Manually add the new required files to the list of "assets" in packages.json, th
 
 The assets are stored in the repository, thus don't forget to create a commit after you add/update/remove dependencies.
 
+Simulating station heartbeats
+-----------------------------
+
+Only stations which have been seen by the server in the last hour (by default, can be customized by `STATION_HEARTBEAT_TIME`)
+are taken into consideration when scheduling observations. In order to simulate an heartbeat of the stations 7, 23 and 42,
+the following command can be used
+
+  $ sudo docker-compose run web python manage.py update_station_last_seen 7 23 42
+
 Coding Style
 ------------
 

network/base/management/commands/update_station_last_seen.py

@@ -0,0 +1,21 @@
+from django.core.management.base import LabelCommand
+from django.utils.timezone import now
+
+from network.base.models import Station
+
+
+class Command(LabelCommand):
+    args = '<Station IDs>'
+    help = 'Updates Last_Seen Timestamp for given Stations'
+
+    def handle_label(self, label, **options):
+        try:
+            gs = Station.objects.get(id=label)
+        except Station.DoesNotExist:
+            self.stderr.write('Station with ID {} does not exist'.format(label))
+            return
+
+        timestamp = now()
+        gs.last_seen = timestamp
+        gs.save()
+        self.stdout.write('Updated Last_Seen for Station {} to {}'.format(label, timestamp))