For iOS there is an app called “Host Monitor”. https://apps.apple.com/app/id989644054
You can connect (ping) hosts (URL, IPs) and can do this even in background.
The frequency can be set to ~hourly, 6 times per day or manual.
So if you set up the server end to fetch the IP of the device with Host Monitor checking; you could make things work the way I believe you want it 😉
For iOS there is an app called “Host Monitor”. https://apps.apple.com/app/id989644054
You can connect (ping) hosts (URL, IPs) and can do this even in background.
The frequency can be set to ~hourly, 6 times per day or manual.
So if you set up the server end to fetch the IP of the device with Host Monitor checking; you could make things work the way I believe you want it 😉