concurrent AP-STA mode in Ubuntu 20.04

Question

I'm using a Jetson Xavier NX hardware with dual band network controller(Intel 8265). So as far as I know, concurrent AP-STA mode can be done.

I've seen some related tutorials(#1, #2) on concurrent AP-STA mode, but just adding interface seems not enough.

I tried step-by-step as below:

nmcli radio wifi off
sudo iw phy phy0 interface add wlan1 type managed

At this moment, I can see that both Wi-Fi wlan0 and wlan1 are Off from GUI. from nmcli device show, both devices wlan0 and wlan1 are in 20 state (unavailable).

GENERAL.DEVICE:                         wlan0
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         AA:AA:AA:AA:AA:AA
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

GENERAL.DEVICE:                         wlan1
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         AA:AA:AA:AA:AA:AA
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

When I turn the Wi-Fi radio on, wlan0 becomes 30 state (disconnected) and I can set wlan0 as AP or STA as I want. However, wlan1 remain 20 state and it shows no text at all on GUI as captured below.

GENERAL.DEVICE:                         wlan0
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         AA:AA:AA:AA:AA:AA
GENERAL.MTU:                            1500
GENERAL.STATE:                          30 (disconnected)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

GENERAL.DEVICE:                         wlan1
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         AA:AA:AA:AA:AA:AA
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

Any way to solve the problem like changing the state of wlan1, or any other methods are appreciated.

Answer 1

Not a perfect solution, but found that the following order works

1. Setup and finish the connection for wlan0
2. Add wlan1 interface (in my case, sudo iw phy phy0 interface add wlan1 type managed)
3. Setup and finish the connection for wlan1

But there is still a (crucial) problem that after adding wlan1, nearly 10 seconds needed to recognize for wlan1 to connect to WiFi.