How to open firewall from terminal

I am developing a go app on a server(mac-mini) where I connect via ssh. I restart the app many times: go run main.go

Problem is, that I dont have access to the graphical ui - "Firewall Options...".

I really like to have the firewall on for security reason and poke minimal holes in it only when needed.

Is there any way to set and allow a port to be open, for incoming connections from the terminal?

1. Configure the firewall to be permissible for selected applications and services.

   To turn the firewall on for specific applications/services :

   sudo defaults write /Library/Preferences/com.apple.alf globalstate -int 1
   

   https://raymii.org/s/snippets/OS_X_-_Turn_firewall_on_or_off_from_the_command_line.html

   Reboot for the change to take effect.

2. /usr/libexec/ApplicationFirewall/socketfilterfw allows you to configure applications through the firewall. The tool provides its own help and documentation.

   For example, to grant an application incoming connections, you can use

   ./socketfilterfw -t "/Applications/Foo.app/Contents/MacOS/Foo"