add code for the uuid normalization

custom_components/eyeonwater/sensor.py

@@ -210,6 +210,9 @@ def __init__(
         """Initialize the sensor."""
         super().__init__(coordinator)
         self.meter = meter
+        chars = [c if c.isalnum() or c == "_" else "_" for c in meter.meter_uuid]
+        self._uuid = "".join(chars)
+
         self._state: pyonwater.DataPoint | None = None
         self._available = False