Per a quick lookup of the TL-WR802N, it seem to be able to act as a client. So you will need to follow their user guide on how to configure it as a client and set it to connect to your Infrastructure SSID and wired to your printer.
Then you may have other settings to do or test for the wired lan port depending if your printer is DHCP or Static IP.
On the Aruba side it should be as another client. You may see the TP-Link MAC address or the printer MAC address depending on the TP-Link settings.
Be carefull though and make sure to look into the aaa profile linked to the virtual AP profile (VAP) of your SSID as you may need to increase the Max IPv4 for wireless user. The default should be 2 but if you do VLAN derivation in your policies, you may need to increase to 4 as depending on the TP-Link setting, it may get an IP for itself + the printer and if doing VLAN derivation there the initial IP and new VLAN IP x2 devices (TP-Link + Printer).