.

src/sml2mqtt/config/config.py

@@ -58,7 +58,8 @@ def default_config() -> Settings:
                         operations=[
                             {'negative on energy meter status': True},
                             {'factor': 3}, {'offset': 100}, {'round': 2},
-                            {'or': [{'type': 'change filter'}, {'heartbeat filter': 120}]}
+                            {'type': 'change filter'},
+                            {'refresh action': 600}
                         ]
                     )
                 ]

src/sml2mqtt/sml_value/operations/filter.py

@@ -64,9 +64,11 @@ def process_value(self, value: float | None, info: SmlValueInfo) -> float | None
         if value is None:
             return None
 
-        perc = abs(1 - value / self.last_value) * 100
-        if perc < self.delta:
-            return None
+        # If the last value == 0 we always let it pass
+        if self.last_value:
+            perc = abs(1 - value / self.last_value) * 100
+            if perc < self.delta:
+                return None
 
         self.last_value = value
         return value

tests/config/test_default.py

@@ -12,7 +12,7 @@ def test_default():
     assert '\n' + yaml == '''
 logging:
   level: INFO         # Log level
-  file: sml2mqtt.log  # Log file path (absolute or relative to config file) or stdout
+  file: sml2mqtt.log  # Log file path (absolute or relative to config file) or "stdout"
 mqtt:
   connection:
     identifier: sml2mqtt-A1b2
@@ -56,7 +56,6 @@ def test_default():
       - factor: 3   # Factor with which the value gets multiplied
       - offset: 100   # Offset that gets added on the value
       - round: 2   # Round to the specified digits
-      - or:
-        - type: change filter   # Filter which passes only changes
-        - heartbeat filter: 120.0   # Interval
+      - type: change filter   # Filter which passes only changes
+      - refresh action: 600.0   # Interval
 '''

tests/sml_values/test_operations/test_filter.py

@@ -54,6 +54,9 @@ def test_diff_percent():
     f = PercDeltaFilterOperation(5)
     check_operation_repr(f, '5%')
 
+    assert f.process_value(0, None) == 0
+    assert f.process_value(0.049, None) == 0.049
+
     assert f.process_value(100, None) == 100
     assert f.process_value(104.999, None) is None
     assert f.process_value(95.001, None) is None