Merge branch 'bugfix-frame-creation' into 'master'

Fix influxdb frame creation modifying the original frame

See merge request metobs/MetObsCommon!4

metobscommon/archive/loggernet_receiver.py

@@ -63,7 +63,7 @@ class LDMPReceiver(object):
         if not self._started:
             return
         self._run_event.clear()
-        self.worker.join()
+        self._worker.join()
         self._started = False
         LOG.info("Background thread successfully terminated")
 

metobscommon/influxdb.py

@@ -64,6 +64,7 @@ def frame_records(frames,
 
         nanos = _mktime(frame, timestamp=timestamp)
         if wind_speed in frame and wind_dir in frame:
+            frame = frame.copy()  # don't alter the original
             spd = frame.get(wind_speed)
             dr = frame.pop(wind_dir)
             e, n, _ = wind_vector_components(spd, dr)