Successfully initialized wpa_supplicant but does’t work - yocto

Question

I'm going mad with a stupid issue I can't solve.
During the testing of my Yocto project I always used connmactl in order to connect my board to the internet.
Now I am going to release the product but before releasing I am working on an “internet connection manager”
I guess I can’t use connmanctl anymore since it consist in an interactive command (isn’t it?) so I’m going to use directly wpa_supplicant.
In my script I edit wpa_supplicant.conf as follow:
root#localhost:~# cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1
bgscan=""
network={
ssid="Obi_Lan_Kenobi"
psk="TheForceIsStrongWithThisOne"
}
After that I try to start wpa_supplicant with this command:
wpa_supplicant -B -i mlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf wext
as result of this command I get:
Successfully initialized wpa_supplicant
But if I try to ping google.com (or any other website) i seet that the network doesn’t work, In particular I get this message: ping: sendto: Network is unreachable
Everything is working under connmanctl, but not under wpa_supplicant.
The strange thing is that running iw command everything seems to be configurated in the right way:
root#localhost:~# iw dev mlan0 link
Connected to 56:0c:ff:37:1a:69 (on mlan0)
SSID: Obi_Lan_Kenobi
freq: 2412
RX: 32154 bytes (310 packets)
TX: 19436 bytes (128 packets)
signal: -38 dBm
rx bitrate: 1.0 MBit/s
tx bitrate: 72.2 MBit/s MCS 7 short GI
bss flags: short-preamble short-slot-time
dtim period: 2
beacon int: 100
I honestly can’t understand why.
Does anybody have a suggestion about that?