Auto login after reboot for Beaglebone black (BBB)

By default, BBB board has root log in at console.
My board connected a USB WIFI, I don't want to log in to enter root at console.

1) Auto Login
Edit file:
/lib/systemd/system/serial-getty@.service

[Service]
Environment=TERM=vt100
ExecStart=-/sbin/agetty -a root -s %I 115200

2) Start Service
Create file:
/lib/systemd/system/robot.service

[Unit]
Description=Robot
After=syslog.target network.target network-online.target

[Service]
Type=simple
ExecStart=/usr/bin/run.sh

[Install]
WantedBy=multi-user.target

3) Script file
Create file:
/usr/bin/run.sh

#!/bin/sh

cd /home/root
./run_service.sh

4) Service file

/home/root/run_service.sh

#!/bin/sh

cd /sang/driver

insmod rfkill.ko

insmod cfg80211.ko

insmod mac80211.ko

insmod lib80211.ko

insmod rt2x00lib.ko

insmod rt2800lib.ko

insmod rt2x00usb.ko

insmod rt2800usb.ko

#can bus

echo "can bus set up ..."

echo BB-DCAN1 > /sys/devices/bone_capemgr.9/slots

cd /sang

./canconfig can0 bitrate 300000

ifconfig can0 up

echo "PWM setup ..."

cd /sang/driver

insmod pwm_test.ko

echo am33xx_pwm > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P9_31 > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P9_29 > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P8_36 > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P8_34 > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P8_45 > /sys/devices/bone_capemgr.9/slots

echo bone_pwm_P8_46 > /sys/devices/bone_capemgr.9/slots

5)  run /etc/profile after reboot

Edit /etc/profile

cd /home/root

./run_wifi.sh

6) Start WIFI script file

/home/root/run_wifi.sh

#!/bin/sh

killall wpa_supplicant

ip link set wlan0 up

iw dev wlan0 set power_save off

wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf

iw dev wlan0 link

ifconfig wlan0 192.168.2.77 up

mount -o nolock 192.168.2.99:/home/bsang /nfs &

mount -o nolock 192.168.2.96:/home/bsang /nfs2 &