wpa_supplicant for dual WLAN

You create two separate wpa_supplicant.conf files, one for each interface. Then you specify which conf file goes with which interface when you invoke wpa_supplicant. You use the -N option to show that you want to start describing a new interface.

This example comes right out of the wpa_supplicant(8) man page:

wpa_supplicant \
    -c wpa1.conf -i wlan0 -D hostap -N \
    -c wpa2.conf -i ath0 -D madwifi

You will need to create two new files in the following directory: /etc/wpa_supplicant/

The new files should be named with the interface name i.e wpa_supplicant-wlan1.conf

You should end up with two files like so:

for interface wlan0:

file /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

for interface wlan1:

file /etc/wpa_supplicant/wpa_supplicant-wlan1.conf

content of wpa_supplicant-wlan0.conf file

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

country=US

network={
        ssid="ssid0"
        psk="pass0"
}

content of wpa_supplicant-wlan1.conf file

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

country=US

network={
        ssid="ssid1"
        psk="pass1"
}

reboot PI and you should have SSID attached to an interface.

@jaanhio Sorry can't comment, thus as an answer. Can somebody please move it to the comments? I think it is quite interessting to know why creating a file wpa_supplicant-wlan1 works.

junaid's answer is correct for debian. On debian (or at least Raspbian Buster) dhcpcd controls wpa_supplicant in /usr/share/dhcpcd/hooks/10-wpa_supplicant you find

if [ -z "$wpa_supplicant_conf" ]; then
        for x in \
                /etc/wpa_supplicant/wpa_supplicant-"$interface".conf \
                /etc/wpa_supplicant/wpa_supplicant.conf \
                /etc/wpa_supplicant-"$interface".conf \
                /etc/wpa_supplicant.conf \
        ; do
                if [ -s "$x" ]; then
                        wpa_supplicant_conf="$x"
                        break
                fi
        done
fi

So there is these behaviour with wpa_supplicant-wlan0.conf and wpa_supplicant-wlan1.conf files "documented"

Thus you also don't need a reboot when changing. Just exec sudo systemctl restart dhcpcd

wpa_supplicant for dual WLAN

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