Wlan0: Deauthenticating by Local Choice

I'm trying to set up station mode on my device. It works fine if i give the wpa_supplicant command on command line after boot up. But disconnects when i give those commands in a script and then make a systemd service. And after it disconnects, wlan0 still has the ip address. and i have to flush it using ip addr flush dev wlan0. (Also, my wpa_supplicant executable is in /home/root.)

This works: Below are the commands which i gave manually on cli and i was able to ping. No issues.

/home/root/wpa_supplicant -B -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf
dhclient -i wlan0

Or the script ./station_mode.sh can be ran instead and it gives no error. I'm getting the error only when i start the station.service which is given below.

This doesn't work - Same commands given in service throws error.

My script : station_mode.sh

#!/bin/sh

rfkill unblock all
/home/root/wpa_supplicant -B -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf
dhclient -i wlan0

My systemd service: /etc/systemd/system/station.service

[Unit]
Description=station mode service.

[Service]
Type=simple
ExecStart=/bin/sh /home/root/station_mode.sh

[Install]
WantedBy=multi-user.target

Commands i gave:

systemctl stop wpa_supplicant
systemctl disable --now wpa_supplicant
systemctl start station

Output:

[ 2303.299834] wlan0: authenticate with be:37:a5:d8:96:36
[ 2303.334731] wlan0: send auth to be:37:a5:d8:96:36 (try 1/3)
[ 2303.344189] wlan0: authenticated
[ 2303.348966] wlan0: associate with be:37:a5:d8:96:36 (try 1/3)
[ 2303.369211] wlan0: RX AssocResp from be:37:a5:d8:96:36 (capab=0x1431 status=0 aid=1)
[ 2303.384351] wlan0: associated
[ 2320.245795] wlan0: deauthenticating from be:37:a5:d8:96:36 by local choice (Reason: 3=DEAUTH_LEAVING)