How to set up a PPTP VPN server on AirOS?

Question

VPN

Good day, gentlemen!
The question arose of how it is possible to raise a VPN server on the Nanostation Loco m5 device. Please do not offer a variant with DD-WRT and Open-WRT firmware.
I came across a manual, in Catalan . Perhaps someone will tell the veracity of this method.
And my story is this, I fled the country "U" for all known reasons, but in the state "P" there is a global firewall, so I would like to get a little freedom from one personal remote device.

Answer 1

In vain he fled to the state "P" !!!!
Were you able to set up a VPN?

Answer 2

1- SSH your device
2- cd /etc/persistent
3- vi rc.poststart
4- Make sure you use Insert and paste the content down here
5- Edit with your values
​​6- ESC, :wq (saves with vi)
7- save (saves permanently on flash)
8- reboot and enjoy
#CONTENTS OF /etc/persistent/rc.poststart
killall pptp
killall pppd
killall pwdog
rm -rf /etc/ppp/peers/xdccxdcc
rm -rf /etc/ppp/chap- secrets
rm -rf /etc/ppp/reconnect-script
mkdir /etc/ppp/peers/
touch /etc/ppp/peers/xdccxdcc
touch /etc/ppp/chap-secrets
touch /etc/ppp/reconnect-script
chmod +x /etc/ppp/reconnect-script
chmod 0600 /etc/ppp/chap-secrets
cat << EOF > /etc/ppp/peers/xdccxdcc
pty "pptp HOSTNAME --nolaunchpppd"
noproxyarp
ipparam xdccxdcc
remotename xdccxdcc
name USERNAME
require-mppe-128
nobsdcomp
nodeflate
lock
noauth
refuse-eap
mtu 1400
mru 1400
EOF
cat << EOF > /etc/ppp/chap-secrets
USERNAME xdccxdcc PASSWORD *
EOF
cat << EOF > /etc/ppp/reconnect-script
killall pptp
killall pppd
sleep 5
pppd call xdccxdcc
sleep 40
ping -c 5 10.147.147.1 &
sleep 20
killall ping
exit 0
EOF
echo "route add -net 192.168.27.0 netmask 255.255.255.0 gw 10.147.147.1 dev ppp0" >> /etc/ppp/ip-up
echo "route add -net 10.147.147.0 netmask 255.255.255.0 gw 10.147.147.1 dev ppp0 " >> /etc/ppp/ip-up
/bin/pwdog -d 60 -p 140 -c 4 -m 300 -e "cd /etc/ppp && ./reconnect-script" 10.147.147.1 &
pppd call xdccxdcc &