I am not using domains/my IPs. I am using Tailscale program and app.
I have no knowledge about Port Forwarding and no access to my landlord's router, so I use Tailscale. It is easy for me that way.
I would recommend it. It is a free software and no need to touch your router or pay for domains.
Basically you download the Tailscale for Windows, for example, and to your phone, after you logged in with username and password you created.
Then each device gets it own IP address, that only you can access from any other device that runs Tailscale
So for example, the computer that runs SDRTrunk+rdioScanner got 100.12.34.56 IP thanks to the Tailscale installed on it, then you enter the that IP into the rdioScanner app (in Android) for example
https://100.12.34.56/ or
http://100.12.34.56:3000/ as the Server URL in the Settings of the rdioScanner scanner app in Android and the Access Code you set in rdioScanner /admin page (if you didn't change it it is rdio-scanner) and hopefully it will connect
- So computer with SDRTrunk has rdioScanner. Check that you can access it with localhost:3000
Then with Tailscale running on that computer, check that you can connect with the IP that Tailscale gave you and probably :3000 at the end. If all is well - the instructions I wrote above about Android + Tailscale app + rdioScanner app will work