Normally I’d connect Epson R2000 using the dreaded WPS. There is no display on the device. I can enable wifi on my ISP router and connect the printer, but I hope there is a better way. I printed network status form the printer, so I have WPS-PIN code & MAC. Any suggestions how to connect the printer without using the ISP router? I use linux, so the windows software and temporary usb connection is not an option.
Printer manual [1]
[1] https://files.support.epson.com/pdf/r2000_/r2000_bs.pdf
Maybe try to enable WPS support on Omnia? I didn‘t try it and have no need for it, but google returns this guide e.g.:
http://wordpress.bwalle.de/2014/06/using-wps-with-openwrt/
I don‘t know if it‘s compatible to Turris OS
Edit: You could also set up a virtual windows PC 
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Thanks! I’ll give it a try. Setting up a virtual windows would the ultimate insult to my linux skills 
Edit:
root@turris:~# hostapd_cli wps_pbc
Selected interface ‘wlan0’
FAIL
TL;DR:
-
Add wps_pushbutton to relevant section of /etc/config/wireless
config wifi-iface
option device 'radio1'
<- I can’t shift that line right, but it’s indented
option wps_pushbutton '1'
<- I can’t shift that line right, but it’s indented
-
reboot (<-- I’m not sure how to avoid it, but it wasn’t a problem in my case)
-
hostapd_cli wps_pbc should return OK now
root@turris:~# hostapd_cli wps_pbc
Selected interface 'wlan1'
OK
-
Trigger pairing on the printer (long press of wifi button) and it should establish connection.
Thanks for the help gals & lads!
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Thank you for these instructions, they got me up and running! 
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Enabling WPS still works, but I can’t get the Epson R2000 to connect anymore. Logs show it’s authenticated, but it doesn’t show as a new device, Leds are showing error (yellow blinks) or even better that eethernet is connected. Might be damaged printer or updated on turris. Hard to tell…