####

https://stackoverflow.com/questions/30251889/how-can-i-open-some-ports-on-ubuntu
open port 
sudo ufw allow 1701
sudo ufw allow 11200:11299/tcp
sudo ufw allow 11200:11299/udp
sudo ufw allow 22/tcp
sudo ufw allow 22
sudo ufw deny 22

To show lists of all open ports:
sudo netstat -lnp


Listening ports Numbers with the Process responsible on each one.
Terminate or kill the process to close port.


moquitoo
docker
postgres docker image.
paho library
mqtt client library
nvm 
pm2
pnpm