Hello, 

I am trying to setup the TL-WR802N but am not able to access to the device. can't connect to the device even from command line.

I am getting this error concerning the length of the default password 

nmcli -g all dev wifi connect "TP-Link_702C" password "admin"
Error: 802-11-wireless-security.psk: property is invalid.

I am running ubuntu 20.04