Improve relative dimming decode

custom_components/ha_knx_bridge/bridge.py

@@ -1172,7 +1172,7 @@ class BridgeManager:
             return
 
         if action == "relative_dimming":
-            value = _extract_event_value(event)
+            value = _extract_dimming_value(event)
             if value is None:
                 return
             if value in (0, 8):
@@ -1188,7 +1188,7 @@ class BridgeManager:
             return
 
         if action == "relative_color_temperature":
-            value = _extract_event_value(event)
+            value = _extract_dimming_value(event)
             if value is None:
                 return
             if value in (0, 8):
@@ -1511,6 +1511,30 @@ def _extract_event_value(event: Event) -> int | None:
         return None
 
 
+def _extract_dimming_value(event: Event) -> int | None:
+    if "value" in event.data:
+        value = event.data["value"]
+        if isinstance(value, dict):
+            control = value.get("control")
+            step = value.get("stepcode", value.get("step_code"))
+            if control is not None and step is not None:
+                try:
+                    control_bit = 1 if int(control) else 0
+                    step_code = int(step) & 0x07
+                    return (control_bit << 3) | step_code
+                except (TypeError, ValueError):
+                    pass
+    data = event.data.get("data")
+    if isinstance(data, (list, tuple)) and len(data) >= 2:
+        try:
+            control_bit = 1 if int(data[0]) else 0
+            step_code = int(data[1]) & 0x07
+            return (control_bit << 3) | step_code
+        except (TypeError, ValueError):
+            return None
+    return _extract_event_value(event)
+
+
 def _clean_address(address: Any) -> str | None:
     if not address:
         return None