The uncontrolled measurement update message is used for updating the consumption/production information of an
appliance form the appliance driver to the energy app. Since the energy behaviour of an uncontrolled appliance can be
very unpredictable (for instance the power output of a PV inverter), this measurement update message only contains a
measured value and does not provide any information on how long this value is valid. Typically the appliance driver
must send a new measurement update message to the energy app whenever the value of the measurement is updated.