[darkwater]

Well, if you want to connect to your home LAN from your phone anywhere in the world you either need SSH or some VPN port opened either. Alternatively you can use some SaaS server where everything initiate the connection against the remote SaaS endpoint, but if you want to stay 100% local you need to open a port.

For ssh changing the port to something else usually takes out 99% of bots.

[tonymet]

Most VPS systems have an API to manage security group/ firewall.

When you arrive at the new location, call the API to open up the new address.

Here is the API on AWS https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_A...

Alternatively run a VPN or TailScale