Any app you've got in mind? The only one on https://search.f-droid.org/?q=firewall https://search.f-droid.org/?q=firewall doesn't seem to be of interest for tha

Any app you've got in mind? The only one on https://search.f-droid.org/?q=firewall https://search.f-droid.org/?q=firewall doesn't seem to be of interest for that purpose.