The default for most devices is to have the full class C range (the last octet) available for DHCP.
For most devices you should be able to go in to the configuration and change the address range.
This could allow you to reserve some for static IP addresses. ( In some, you can change the lease time. )
In some, you can set it up so that you can assign the ip address based on the devices MAC address. This is ‘quasi static’.
For wi-fi… you should be able to set a static IP address on the RS130 unit and then set that same IP address as static on the router. As @burki indicated you should be able to change the range so that your IP address you set for the Rose is in a static range.
@Lasi PM me, I may be able to help.