MultiCommand Command Class can be turned on or off in Arduino IDE menu. This flag adds MultiCommand in Z-Uno. This Command Class allows to reduce the number of packets transmitted between Z-Uno and other devices on the network, so communication will be faster and consume less battery power. Most notably, it will affect the process of inclusion in the network, which will be held 3-5 times faster This class is not supported by all Z-Wave controllers , in case of problems it is recommended to disable it You must upload your sektch and then exclude or reset Z-Uno to apply these changes.