This help article explains the steps that need to be taken to map specific IP addresses for client devices. Through the controller you can map specific IP addresses for LAN & WIFI clients
LAN client :
Select the network you are configuring under the Network dropdown
Go to Configuration, Network.
Select the Edit button on the far right for the VLAN policy.
Under the field DHCP Settings, Mappings, enter the IP address you wish to reserve and the MAC ID of the LAN connected client device.
Select the Update button at the bottom of the page.
Configure the client device’s Ethernet port with the Static IP address.
Wifi clients :
Select the edit button for the SSID policy.
Locate the field Mode, and select Router
Locate the DHCP Settings
Follow the same steps outlined above.
Configure the client device’s Wifi with the Static IP address.
Click Update SSID.