The BluOS App does have the ability to set a Static IP fro your Players. You can however set a DHCP reservation to the MAC Address of your Bluesound Player in your router. This will allow for the Player to always be assigned the same IP Address on each restart. This includes the router also being restarted. Consult your router documentation to set a DHCP reservation.
Wireless Bluesound Players include two MAC Addresses. The MAC Address for the wired network interface is located on the back or bottom of The Player. The MAC Address for the wireless network interface can be located under Help, Diagnostics, More in the system Log near the top under WLAN.
If you do require to enter a Static IP for third party integration, please contact the BluOS Support Crew by pressing Submit below.