Add double timestamp debug-message

Author: bouwew

plugwise_usb/nodes/helpers/pulses.py

@@ -190,7 +190,8 @@ def collected_pulses(
         if is_consumption and self._pulses_consumption is not None:
             timestamp = self._pulses_timestamp
             if self._prev_timestamp == timestamp:
-                return
+                _LOGGER.debug("collected_pulses | %s | double timestamp=%s", self._mac, timestamp)
+                return (None, None)
 
             delta_cons_pulses = self._pulses_consumption - self._prev_pulses_consumption
             pulses = self._prev_pulses_consumption + delta_cons_pulses