(self, characteristic, on_change)
Call the specified on_change callback when this characteristic
        changes.
Call the specified on_change callback when this characteristic
        changes.
Call the specified on_change callback when this characteristic changes .
def _notify_characteristic(self, characteristic, on_change):
        """Call the specified on_change callback when this characteristic
        changes.
        """
        # Associate the specified on_changed callback with any changes to this
        # characteristic.
        self._char_on_changed[characteristic] = on_change
def _notify_characteristic ( self , characteristic , on_change ) : # Associate the specified on_changed callback with any changes to this # characteristic. self . _char_on_changed [ characteristic ] = on_change