How do I enable Wi-Fi Direct mode on the ET-2850?
Press the home button, select Wi-Fi Setup, choose Wi-Fi Direct, and press OK twice. Product information will display on the LCD screen. You can then open the Epson Smart Panel app to connect your device, or manually select the Wi-Fi network name (SSID) and password displayed on the LCD screen. The blue Wi-Fi Direct icon will display when successfully enabled.
From the official Epson EcoTank ET-2850 All-in-One Printer manual, page 34
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