simplified return type of time functsion

miflora/miflora_poller.py

@@ -20,8 +20,6 @@
 MI_MOISTURE = "moisture"
 MI_CONDUCTIVITY = "conductivity"
 MI_BATTERY = "battery"
-_MI_DEVICE_TIME = "device_time"
-_MI_WALL_TIME = "wall_time"
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -239,8 +237,8 @@ def fetch_history(self):
                         raise
                     _LOGGER.info("Progress: %d of %d", i+1, history_length)
 
-        _time = self._fetch_device_time()
-        time_diff = _time[_MI_WALL_TIME] - _time[_MI_DEVICE_TIME]
+        (device_time, wall_time) = self._fetch_device_time()
+        time_diff = wall_time - device_time
         for entry in data:
             entry.compute_wall_time(time_diff)
 
@@ -273,10 +271,7 @@ def _fetch_device_time(self):
         device_time = int.from_bytes(response, BYTEORDER)
         _LOGGER.info('device time: %s local time: %s', device_time, wall_time)
 
-        return {
-            _MI_DEVICE_TIME: device_time,
-            _MI_WALL_TIME: wall_time
-        }
+        return device_time, wall_time
 
 
 class HistoryEntry(object):