LED blinking once per second: The gateway is not connected to the wifi network 

LED blinking once every 3 seconds: The gateway is connected to the router but not to

the eZLO cloud server

LED OFF: The gateway is connected to the server and everything is okay

LED ON: The gateway is in inclusion/exclusion mode (ie. adding or removing a Z-Wave device). When the gateway is in exclusion mode and the device is successfully excluded, the LED will go OFF (as confirmation) until you switch it again to inclusion.

LED blinking rapidly: The Z-Wave device being paired was detected by the gateway

and it is being configured.