This app was mentioned in 1 comment, with an average of 1.00 upvote
So I changed both section "firewall > port forwarding" and in "advance > network settings > port forwarding rules" to:
TCP Any -> 3000
UDP Any -> 3000
TCP Any -> 3001
UDP Any -> 3001
I checked port 3000 and 3001 on canyouseeme.org and the ports are now opened. But I am still unable to see my DRV system cameras from my mobile phone on mobile data.
I am using the app RXCamLink and this is the DRV's connection settings.
EDIT:It's working! Instead of using the IP address, 192.168.1.100, of my DRV system, I used my public IP followed by by client port, 3000. I entered this information into the app device manager screenshot I posted above. I am now able to view my camera system on my mobile phone using either my mobile data or my home network! I'm assuming this would work with any internet connection. Thanks so much for your help!