This method allows you to connect the printer directly to smart devices without a wireless router.
You only need to make these settings for the printer and the smart device that you want to connect to once. Unless you disable Wi-Fi Direct or restore the network settings to their defaults, you do not need to make these settings again.
Tap 
on the home screen.
Tap Wi-Fi Direct.
Tap Start Setup.
Tap Other OS Devices.
The Network Name(SSID) and Password for Wi-Fi Direct for the printer are displayed.
On the smart device's Wi-Fi screen, select the SSID shown on the printer's control panel, and then enter the password.
On the printer's control panel, select Next.
On the smart device, start Epson printing app.
Examples of Epson printing apps
On the Epson printing app screen, tap Printer is not selected..
Select the printer that you want to connect to.
See the information displayed on the printer's control panel to select the printer.
On the printer's control panel, select Complete.
For smart devices that have been connected to the printer before, select the network name (SSID) on the smart device's Wi-Fi screen to connect them again.